Chevrolet Corvair

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Template:Infobox Automobile The Chevrolet Corvair is a compact automobile produced by the Chevrolet division of General Motors from 1960-1969 — the only American-made, mass-produced passenger car to feature a rear-mounted engine. Chevrolet initially marketed the Corvair as a six passenger four-door sedan, and subsequently as coupe, convertible and station wagon models. The Monza, a five-passenger coupe with bucket seats was introduced late in the 1960 model year. The Monza Spyder and later Corsa models were among the first American cars to offer a turbocharged engine. Corvair derivatives included a compact passenger van marketed as the Greenbrier, and commercial vehicles including the "Corvan 95" panel van and two versions of a two-door pickup truck. Pontiac built a rebadged variant prototype the Polaris, but it wasn't brought to production.

Compact

The Corvair—like the Ford Falcon and the Plymouth Valiant — was one of the first entries of a new compact car class responding to the small, fuel-efficient automobiles imported from Europe — with its design and engineering advancing the rear-engine, rear-wheel drive layout pioneered by cars including the Volkswagen Beetle, Renault Dauphine, and NSU Prinz — and employed by the concurrent and short-lived Hino Contessa. Unlike the Falcon and Valiant nameplates, whose conventional designs tended to attract customers from the profit-driving full-size models from their respective manufacturers, the Corvair's un-conventional design drew customers from makes such as Volvo and VW, as well as from the Rambler. Because such customers had not been likely to contemplate a larger Chevrolet Biscayne, most Corvair sales did not translate into lost Biscayne sales. Corvair sales were almost entirely "new business" for Chevrolet. Other compacts such as the Chevy II/Nova, Pontiac Tempest, and later subcompact Chevrolet Vega — were smaller versions of conventional automobiles with front-mounted, water-cooled inline engines.

History

Origin 1956

File:Corvair Assembly line-1960.jpg

1960 Corvair Assembly line - workers lift the rear-mounted engine and suspension sub-assemblies to a 700 series sedan body.

The Corvair name originated in 1954 as a Corvette fastback show car. Several Chevrolet concept cars of the period, including the Nomad, were based on Chevrolet's sports car. The Corvair was championed by Ed Cole, holding chief engineer and general manager positions at Chevrolet in the 1950s. As the first American response to the growing popularity of small, lightweight imported cars, design began in 1956 with the first vehicles rolling off the assembly line in late 1959 for the 1960 model year. Two Corvairs were tested at the Riverside International Raceway in Riverside, California, for 24 hours. One car rolled over, but the other completed the drive using only one quart (0.95 L) of oil. The Corvair was introduced to the public early in 1960 at the Hal Roach Studios as actress Shirley Bonne unveiled the first model.

Overview

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1964 Corvair Monza Convertible

The Corvair was a relatively successful model for Chevrolet, with annual unit sales exceeding 200,000 for each of its first six model years. Chevrolet deliberately designed it as a radical departure from the conventional Chevrolet. The rear engine design offered enormous packaging and economy advantages, providing the car with a lower silhouette, flat passenger compartment floor, obviating the need for power assists, reducing the need for air conditioning (due to the absence of engine heat blowing over the passenger compartment), and offering dramatic improvements in ride quality, traction, and braking balance. The radically different design also attracted customers from other makes, primarily imports. This was an important and often under-emphasized reason of the car's success. The Corvair stood out with engineering significantly different from other American offerings. It was part of GM's innovative Y-body ("Z"-Body from 1965 on) line of cars, with design and engineering that advanced the rear-engine, rear-wheel drive layout pioneered by cars including the Tucker Torpedo, Porsche 356, Volkswagen Beetle, Renault Dauphine, and NSU Prinz — and employed by the concurrent and short-lived Hino Contessa.

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The Corvair's innovative flat-6 engine

The Corvair's powerplant is an aluminum air-cooled 140 in³ (2.3 L) flat-6. The first Corvair engine produced 80 hp (60 kW). Power peaked with the 1965-66 turbocharged 180 hp (134 kW) Corsa engine option. The first generation model's swing axle rear suspension, invented and patented by engineer Edmund Rumpler, offered a comfortable ride but raised safety concerns associated with the car's handling stability, and was replaced in 1965 with a fully independent rear suspension similar to the Corvette Sting Ray.

The Corvair represented a breakthrough in unibody construction for mass-produced Detroit vehicles, the most successful automobile of this type up to that time, with 1,786,243 cars being produced between 1960 and 1969. The Corvair was built from uniform molds and relied on the shaping of the glass and doors for help with structural integrity. Convertible versions had special supports welded underneath to compensate for the lack of a steel roof.

End of the Corvair 1969

File:69 corvair brochure.jpg

By request only 1969 Corvair brochure

According to noted GM historian Dave Newell, Chevrolet had planned on ceasing Corvair production after the 1966 model year. Development and engineering changes were halted in 1966 on the year-old, redesigned second-generation cars with mainly federally mandated emissions and safety changes made thereafter. A variety of factors contributed to Corvair's plummeting sales in 1966. Ralph Nader, attorney and consumer advocate Template:Down arrow in his book Unsafe At Any Speed published in November 1965. A chapter in the book alleged the 1960-63 Corvair's swing axle design rear suspension contributed to a greater tendency of loss of driver control, spin-out and roll-over. 1966 Corvair sales subsequently fell to half from the sales of 1965. The Corvair had faced increasing competition from the Ford Mustang, Chevy's own Camaro, and other pony cars in—ironically, a market pioneered by the Corvair Monza. The car had been costly to produce, yet was not offered at a premium price; not a high profit earner for Chevrolet as was the Corvette for example. An increasing lack of interest from the company, especially from Chevrolet's General Manager John DeLorean, and a complete absence of Corvair advertising after 1967 reflected the company's priorities, including promotion of three redesigned models for 1968—the Corvette, Chevelle and Chevy II Nova. The Corvair was referred to as "the phantom" by Car Life magazine in their 1968 Monza road test, and by 1969 Chevrolet's Corvair four-page brochure was "by request only". An indication of the Corvair's imminent demise was when the 1969 models were introduced: GM equipped all of its 1969 models one year ahead of government requirements with a steering column-mounted, anti-theft ignition switch and a new, square-shaped ignition key. All except the Corvair. It got the new key but was the only GM car to retain the dashboard ignition switch. That final year, only 6000 cars were produced. Cars from November 1968 through May 1969 were virtually hand-built by a dedicated Corvair team in an off-line area of the assembly plant in order to ramp up Nova production (built at the same plant) to keep up with its increasing demand.

Generations

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First generation 1960–1964

The 1960 Corvair 500 and 700 series four-door sedans were conceived as economy cars offering few amenities in order to keep the price competitive, with the 500 (base model) selling for under $2,000. Powered by an Template:Convert engine and three-speed manual or two-speed Powerglide automatic transmission, the Corvair was designed to have comparable acceleration to the six-cylinder full-size Chevrolet Biscayne. Introduced in January 1960, two-door models have a fold-down rear seat for added storage capacity, which was greatly needed as the spare tire was stowed in the forward trunk compartment. The passenger compartment was heated by a gasoline heater mounted next to the spare tire in the luggage compartment. While it offered immediate hot air, customers complained of what they thought might be decreased gas milage on cold days and through long winters. Chevrolet redesigned the heating system for the 1961 model year, yet left it up to customers to choose the gas heater until the end of the 1964 model year. The line quickly grew from utilitarian bench seat sedans and coupes to the more plushly appointed bucket seat interiors of the new 900 series Monza. It hit showroom floors in the Spring 1960. Two available options on Monza were a more powerful engine, rated at Template:Convert thanks to a more radical camshaft paired with low-restriction exhaust, and the introduction of a fully-synchronized, four-speed transmission. Despite its late introduction, the Monza sold 12,000 units, making it one of the most popular Corvairs. The Corvair was Motor Trend magazine's Car of the Year for 1960. The 1961 Monza was heavily promoted and sometimes referred to as "the poor man's Porsche". The Monza series expanded with a four-door sedan body style in addition to the two-door coupe, and garnered about 144,000 sales.

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1961 Corvair 500 Lakewood station wagon

A station wagon body-style, the Lakewood was added to the lineup in 1961 which has the flat-6 engine under the cargo floor. It contains a total of 68 ft³ (1.9 m³) of cargo room — 58 in the main passenger compartment, and another 10 in the "trunk" under the hood. For 1961 an optional four-speed manual transmission was added. The Corvair engine received its first size increase to 145 in³ courtesy of a slight increase in bore size. The base engine was still rated at 80 hp (60 kW) when paired with the manual transmissions and 84 hp (63 kW) when mated to the optional automatic transmission in Monza models. The high-performance engine was rated at 98 hp (73 kW). To increase luggage capacity in the front the spare tire was relocated to the engine compartment in cars not ordered with All Weather air conditioning and the gasoline heater was replaced by a system of ducts that redirected warmed air from the cylinder heads to the passenger compartment. The gasoline heater remained available as an option through 1964. Corvair was the first of the compacts to offer factory air conditioning, as a mid-1961 option introduction. The large condenser lay flat atop the horizontal engine fan. A large, green painted reverse rotation version of the standard GM Frigidaire air conditioning compressor was used, and an evaporator housing was added under the dash with integrated outlets surrounding the radio housing. All Weather Air Conditioning was not available on wagons, Greenbrier/Corvair 95, or the turbocharged models introduced later due to space conflicts in those models. Chevrolet also introduced the Corvair 95 line of light-duty trucks, which used the Corvair driveline and are forward-control, with the driver sitting over the front wheels, as in the Volkswagen Type 2.

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1961 Corvair Greenbrier Sportswagon

The Greenbrier Sportswagon uses the same body as the "Corvan 95" panel van with the side windows option, but was marketed as a station wagon and was available with trim and paint options similar to the passenger cars, arguably making it the first American minivan. The "Corvan 95" model was also built in pickup versions; the Loadside was a fairly typical pickup of the era, except for the rear engine, forward controls, and a pit in the middle of the bed. The popular Rampside, which, as its name implies, has a large fold-down ramp on the side of the pickup bed. Rampsides were used by the Bell System because of the ease with which cable reels could be rolled in and out of the bed.

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The Corvair Spyder turbocharged engine

In 1962, Chevrolet introduced the 150 hp (112 kW) turbocharged Monza Spyder option for Monza coupes and convertibles mid year, making the Corvair one of the first two production automobiles to come with a turbocharger as a factory option, with the Oldsmobile F-85 Turbo Jetfire of the same year. The 500 station wagon was dropped in favor of the Monza wagon at introduction, however all station wagons were discontinued mid year in favor the new Corvair Convertible and Chevy II (built at the same assembly plant). Self adjusting brakes were new for 1962. Metallic brake linings and a heavy duty suspension consisting of a front anti roll bar, rear axle limit straps, revised spring rates and recalibrated shock absorbers were introduced as optional equipment. The Monza Spyder features a multi-gauge instrument cluster which includes a tachometer, cylinder head temperature and intake manifold pressure gauges, Spyder fender script and Turbo logo deck emblems in addition to the high performance engine.

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1962 Corvair Monza Coupe

The Monza Coupe was the most popular model with 151,738 produced out of 292,531 total Corvair passenger car production for 1962. The 1963 model year saw the availability of a long 3.08 gear for improved fuel economy, but the Corvair otherwise remained largely carryover with minor trim and engineering changes. The Loadside pickup was discontinued at the end of the model year. For 1964 significant engineering and safety changes occurred, while the model lineup remained relatively unchanged. The engine displacement was increased from 145 to 164 in³ (2.3 to 2.7 L) due to an increase in stroke; the base engine power increased from 80 to 95 hp (60 to 70 kW), and the high performance engine increased from 95 to 110 hp (70 to 80 kW). The Spyder engine rating remained at 150 hp (112 kW) despite the displacement increase of the engine. 1964 saw an improvement in the car's swing axle rear suspension; a transverse leaf spring was added in an effort to diminish rear roll stiffness and foster more neutral handling attributes in addition to supporting a high proportion of the engine weight. Spring rates could now be softer at both ends of the car compared to previous models. The heavy duty suspension was no longer optional, although all models now had a front anti-roll bar as standard. Brakes were improved with finned rear drums. The remaining pickup, the Rampside, was discontinued at the end of the model year. Template:Infobox Automobile

Second generation 1965–1969

A dramatic redesign of the Corvair came in 1965. The new body showed influence from the Corvette Stingray and the 1963 Buick Riviera. The mild coke bottle styling set the trend for GM cars for the next fifteen years, foreshadowing the 1967 Camaro. For the first time, none of the passenger cars had a "B" pillar, making all closed models true hardtops. The second generation's styling was rated timeless when new, and considered contemporary today in comparison to the first generation. A new fully independent suspension, similar in design to the Corvette, replaced the original swing axle rear suspension. Car and Driver magazine's David E. Davis Jr. showed enthusiasm for the 1965 Corvair in their October 1964 issue:

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1965 Corvair Corsa Hardtop Coupe

"And it is here too, that we have to go on record and say that the Corvair is — in our opinion — the most important new car of the entire crop of '65 models, and the most beautiful car to appear in this country since before World War II." "When the pictures of the '65 Corvair arrived in our offices, the man who opened the envelope actually let out a great shout of delight and amazement on first seeing the car, and in thirty seconds the whole staff was charging around, each wanting to be the first to show somebody else, each wanting the vicarious kick of hearing that characteristic war-whoop from the first-time viewer." "Our ardor had cooled a little by the time we got to drive the cars — then we went nuts all over again. The new rear suspension, the new softer spring rates in front, the bigger brakes, the addition of some more power, all these factors had us driving around like idiots — zooming around the handling loop dragging with each other, standing on the brakes — until we had to reluctantly turn the car over to some other impatient journalist ... The '65 Corvair is an outstanding car. It doesn't go fast enough, but we love it." The base 95 hp (71 kW) and optional 110 hp (82 kW) engines were carried forward from 1964. The previous 150 hp (112 kW) Spyder engine was replaced by the normally aspirated 140 hp (104 kW) for the new Corsa. The engine was unusual in offering four single-throat carburetors, to which were added larger valves and a dual exhaust system; The 180 hp (134 kW) turbocharged engine was optional on the Corsa, which offered either standard three-speed or optional (US$92) four-speed manual transmissions. The 140 hp (104 kW) engine was optional on 500 and Monza models with manual or Powerglide transmissions. Many new refinements appeared on the beautiful new 1965 redesign. The Corsa came standard with an instrument panel featuring a Template:Convert speedometer with resettable trip odometer, a 6,000 rpm tachometer, cylinder head temperature gauge, analog clock with a sweeping second hand, a manifold vacuum/pressure gauge and fuel gauge. A much better heater system, larger brakes borrowed from the Chevelle, a stronger differential ring gear, a Delcotron alternator (replacing the generator), and significant chassis refinements were made. AM/FM stereo radio, in-dash All Weather Air Conditioning, telescopically adjustable steering column, and a Special Purpose Chassis Equipment ("Z17") handling package, consisting of a special performance suspension and quick ratio steering box, were significant new options for 1965. By this time, the station wagon, panel van, and pickup body styles had all been dropped and 1965 would be the last year for the Greenbrier window van, which was retained mainly for fleet orders, with 1528 being built. In all, 235,528 Corvairs were built in 1965. Chevrolet replaced the Corvair-based vans with the Chevrolet Sportvan/GMC Handi-Van, which used a traditional front engine/rear drive axle borrowed from the Chevy II.

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1966 Corvair 500 Hardtop Coupe

The 1966 lineup remained essentially unchanged from 1965. One change of note was a more robust 4-speed synchromesh transmission using the standard Saginaw gear set with 3.11:1 first gear ratio used by other GM 6-cylinder vehicles. The new 3- and 4-speed transmission was capable of handling more stress. It was a great improvement over the older 3-speed transmission, having a synchronized first gear. A flexible plastic air dam ("spoiler") was installed below the front valence panel to conceal the front suspension and underbody, and lessen crosswind sensitivity. The 1966-1969 lenses protrude further from the bezels, and the backup light is less obvious, located inside the inboard lens. In front, The "lock door" emblem (covering the lockset for the trunk lock) was changed from red to blue and featured a shorter bar, angled at its ends instead of being pointed. The Corvair script nameplate was moved from atop the trunk lid to a position next to the driver's side headlight bezel.

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1966 Corvair Monza Hardtop Coupe

Sales began a decline as a result of Nader's book and the new Mustang that offered V8s up to Template:Convert compared to Corvair's Template:Convert top powertrain. and rumors of the upcoming "Panther'-the code name for the forthcoming Camaro, slated as a direct competitor for the Mustang. A decision was made to discontinue further development of the Corvair. Production for the model year was down to 103,743. In 1967, the Corvair line was trimmed to the 500 and Monza Hardtop Coupes and Hardtop Sedans, and the Monza Convertible. This model year was the first with true a collapsible steering column. A dual circuit master cylinder with warning light, nylon reinforced brake hoses, stronger steel (instead of aluminum) door hinges, "mushroomed" instrument panel knobs and a vinyl-edged day/night mirror were all made standard equipment. Although taillight lenses were fabricated from the 1966 molds, the "wedding band" chrome trim ring inside each lens was thicker (this detail can trip up even the most knowledgeable Corvair aficionado), and this change was carried through to the end of production. Chevrolet introduced a Template:Convert engine warranty on all Chevrolet models including the Corvair. Chevrolet was still actively marketing the Corvair in 1967, including color print ads and an "I Love My Corvair" bumper sticker campaign by dealers, but production and sales continued to fall off drastically. Only 27,253 copies were built. In 1968, the four-door hardtop was discontinued, leaving three models — the 500 and Monza Hardtop Coupes and the Monza Convertible. All Weather air conditioning was dropped as an option, due to concerns about thermal loading added by the now-standard Air Injection Reactor ("smog pump") which probably hurt sales as factory air became more popular generally in automobiles. The GM multiplex stereo system was also discontinued when new units changed wiring adapters; the Corvair's 9-pin connector would no longer fit the new units. Additional safety features, including side marker lights, and shoulder belts for closed models, were fitted per the federal government's requirements. All advertising was virtually stopped and sales were down to 15,400.

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1969 Corvair Monza Convertible

The final model-year 1969 Corvairs were assembled with the Nova in Willow Run, Michigan, the same facility Corvairs had been built from the beginning. 6000 Corvairs were produced of which only 521 were Monza Convertibles. Demand for Novas was high and a decision was made in November 1968 to move Corvair assembly to a special off-line area in the plant, dubbed the "Corvair Room", making Corvairs produced between that time and May 14, 1969 essentially hand-built by a dedicated Corvair team. Assembled bodies arrived from Fisher Body and awaited assembly in the off-line area. A number of collectors and GM executives expressed interest in purchasing the last Corvair, number 6000, but GM management decided that the Olympic Gold Monza hardtop would not be sold. Representatives from the press, along with corporate execs were present at the small ceremony when car number 6000 got its final fittings and drove off the line to the railroad cars with Novas (and a few Corvairs) ready for dealer shipment. It was not loaded on to a railroad car, however. Some accounts state the car was driven to the roof of the facilty parked with a few other Corvairs reserved for testing and later scrapped; some claim it went to a GM executive; the car has never surfaced. Reaction to the death of the Corvair was mixed, from sadness and regret such a fine car could not survive in the marketplace, to sharp criticism of Chevrolet's decision they had continued building the car. GM's policy has always been to forbid non-employees from photographing in their assembly plants. The Corvair was the exception, as CBS TV did a short story on the last models, with reporter Mike Pappas on-site at Willow Run when car number 6000 was driven off the final assembly line.

Reception

When the Corvair was introduced in 1959, Time featured Ed Cole and the 1960 Corvair on its cover and said: "its fresh engineering is hailed as the forerunner of a new age of innovation in Detroit." Chevrolet sold 26,000 Corvairs its first two days on the market, taking over 35% of Chevy's two-day total of 75,000. Chevrolet had intended to sell one Corvair for every five Chevrolets. By March 1960, the Corvair comprised 13% of Chevrolet's sales. In 1960, the Corvair received Motor Trend's "Car of the Year" award. Shortly after its introduction, the Corvair faced competition from the Ford Falcon and Mercury Comet and was plagued by problems — though according to a 1960 Time report, "many were the minor bugs that often afflict a completely new car." Problems included a slipping fan belt, carburetor icing and poor fuel mileage "which sometimes runs well under 20 m.p.g." The 1960 model gasoline heater was cited as a problem, which itself could consume up to a quart of gas an hour — with Chevrolet engineers quickly modifying the Corvair's carburetors to improve economy. Upon introduction of the revised second generation, David E. Davis of Car and Driver said "We have to go on record and say that the Corvair is - in our opinion - the most important new car of the entire crop of '65 models, and the most beautiful car to appear in this country since before World War II." In 2007, Time along with Pulitzer Prize winning automotive journalist Dan Neil named the Corvair one of the 50 Worst Cars of All Time, citing the controversy surrounding its rear-suspension and saying it "It leaked oil like a derelict tanker. Its heating system tended to pump noxious fumes into the cabin. It was offered for a while with a gasoline-burner heater located in the front "trunk," a common but dangerously dumb accessory at the time."

Controversy

Alleged dangerous handling

The 1960-1963 Corvair Template:Down arrow became the subject of the first chapter of Ralph Nader's 1965 investigative book, Unsafe at Any Speed. GM had over 100 lawsuits pending in connection with accidents involving the Corvair, which subsequently became the initial material for Nader's investigations. The book highlighted accidents related to the Corvair's suspension and identified the Chevrolet suspension mechanic who had fought management for removing (for cost reasons) the front anti-sway bar installed on later models. Nader’s book cited a promotional film created by Ford Motor Company, in which a Ford test driver purposely turned the Corvair in a way to make it appear unstable, as evidence against the Corvair. Nader said during subsequent Congressional hearings, the Corvair is "the leading candidate for the un-safest-car title." Subsequently, Corvair sales fell from 220,000 in 1965 to 109,880 in 1966. By 1968 production fell to 14,800. Public response to the book played a role in the National Traffic and Motor Vehicle Safety Act in 1966.

Response

A 1972 safety commission report conducted by Texas A&M University concluded that the 1960-1963 Corvair possessed no greater potential for loss of control than its contemporaries in extreme situations. The U.S. Department of Transportation (DOT) issued a press release dated August 12, 1972, setting out the findings of NHTSA testing from the previous year — after the Corvair had been out of production for more than three years. NHTSA had conducted a series of comparative tests in 1971 studying the handling of the 1963 Corvair and four contemporary cars, a Ford Falcon, Plymouth Valiant, Volkswagen Beetle, Renault Dauphine — along with a second generation Corvair (with its completely redesigned, independent rear suspension). The subsequent 143-page report (PB 211-015, available from NTIS) reviewed NHTSA's extreme-condition handling tests, national accident data for the cars in the test as well as General Motors/Chevrolet internal documentation regarding the Corvair’s handling. NHTSA went on to contract an independent advisory panel of engineers to review the tests. This review panel issued their own 24 page report (PB 211-014, available from NTIS) — which concluded that "the 1960-63 Corvair compares favorably with contemporary vehicles used in the tests...the handling and stability performance of the 1960-63 Corvair does not result in an abnormal potential for loss of control or rollover, and it is at least as good as the performance of some contemporary vehicles both foreign and domestic."

Former GM executive John DeLorean asserted in On a Clear Day You Can See General Motors (1979) that Nader's criticisms were valid. Car and Driver magazine criticized Nader for ignoring the need of drivers to cope with changes in driving style when operating the Corvair, not least keeping the rear tires properly inflated. None of the issues Nader raised were problems among owners of the Porsche 911, which had the same layout and similar suspension, nor with the less powerful Volkswagen Type 1 Beetle. Journalist David E. Davis, in a 2009 article in Automobile Magazine, noted that despite Nader's claim that swing-axle rear suspension were dangerous, Porsche, Mercedes-Benz and Volkswagen all used similar swing-axle concepts during that era.

Criticisms

Handling (1960-1963 models)

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1960-63 swing axle suspension

File:Swing Axle Diagram.svg

Swing axle suspension characteristics: :
camber change on bumps, jacking on rebound

The first generation Corvair featured a rear swing axle design similar to that of the Renault Dauphine and Volkswagen Beetle — a design which eliminates universal joints at the wheels and where the rear wheels are always perpendicular to the driveshafts. Unless ameliorated by any of several options, the design can allow rear tires to undergo large camber changes during fast cornering, leading to oversteer — a dynamically unstable condition where a vehicle can lose control and spin — and in extreme cases produce lift-off oversteer.

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1964 swing axle suspension with transverse rear spring & 1965 fully independent suspension

As a design option, Chevrolet had considered but rejected the inclusion of a front anti-roll bar on the original 1960 Corvair, which would have ameliorated the car's handling — shifting weight transfer to the front outboard tire, considerably reducing rear slip angles — thereby avoiding potential oversteer. Instead, Chevrolet relied on tire pressure differential to eliminate oversteer characteristics — low front and high rear tire pressure — a strategy (used on the Renault Dauphine and Volkswagen Beetle) which induced understeer (increasing front slip angles faster than the rear). Nonetheless, the tire pressure differential strategy offered a significant disadvantage: owners and mechanics could inadvertently but easily re-introduce oversteer characteristics by over-inflating the front tires (e.g., to typical pressures for other cars with other suspension systems). While the Corvair offered competent handling, "the average buyer more accustomed to front-engined cars, did not take [into] account the car's different handling characteristics." Chevrolet made a succession of improvements to the first generation Corvair suspension. For the 1962 model year, the front anti–roll bar became available as an option. For the 1964 model year, the front anti-roll bar became standard equipment and the rear suspension was modified to include a camber compensating, transverse-mounted leaf spring extending between the rear wheels to limit rear wheel camber change, and carrying much of the rear weight combined with softer coil springs. For the 1965 model year, the Corvair received a fully independent rear suspension closely resembling that of the contemporary Corvette. The redesigned suspension reduced the rear roll center to half its previous height, using fully articulated half-axles that offered constant camber on the rear tires in all driving situations. The 1965 Corvair was referred to by Motor Trend as "the first American production automobile on the road with fully independent rear suspension." (the Corvette was considered limited production).

Air-cooled engine

The Corvair engine, unique for an American car, presented a different set of requirements for mechanics. A common problem in the earlier years was oil leakage caused by dissimilar metal thermal expansion of the aluminum–and–steel engine. Chevrolet wrestled with several problems of this nature the entire time the Corvair was in production with varying degrees of success. The problems involved in sandwiching cast iron cylinders between an aluminum case and the cylinder heads were highly magnified by putting another cylinder on each bank. The cause of the oil leaks was the material used to manufacture the O-rings at the ends of the pushrod tubes. They were incapable of withstanding the Corvair's engine operating temperatures. After a year of driving, the O-rings became hard and crumbled, allowing the leaks. When the tubes leaked, the oil would drip on the hot muffler piping from the heads creating that oil smell and resulted in bluish smoke coming out the rear vents. It was not until the 1970s that Viton made an O-ring which perfectly fit the tubes and could withstand temperatures up to 500 °F, and today Corvair owners utilize the Vitone o-rings and leaks are gone for several years. Chronic oil leakage from the pushrod tubes, caused by GM's choice of pushrod tube seal material, also contaminated the passenger heating air. That air might also become noxious if a Template:Convert wide rubber seal almost Template:Convert long, located between the engine assembly and the body, was not maintained in like-new condition. The problem of fumes and gases entering the passenger area via the heater system was endemic to air-cooled engines that used heat radiated from the engine directly to heat air for the passenger compartment. Carbon monoxide and other noxious gases could enter the passenger areas if exhaust system gaskets aged or failed. The gaskets were inside the heater box air intakes, and air for engine cooling was used for passenger–compartment heating when the heater was on (or leaking). The 1960 model Corvair used a GM Harrison division gasoline heater located in the front trunk area as its standard heater, similar to the Eberspächer heater offered as an auxiliary heater by Volkswagen as a dealer-installed option. This feature became optional in 1961 and was dropped in 1965 due to weak consumer demand. The Volkswagen Type I Beetle, another automobile with an air-cooled engine, had a heater system which better isolated fresh air from engine cooling air fumes, and was only susceptible to carbon monoxide contamination from the two heat exchanger to muffler seals at the rear of the engine, as opposed to the eight exhaust joints in the Corvair system. The interior air would also be contaminated if the voltage regulator allowed an over-voltage condition and the original battery vent hoses were not attached. The battery, which was mounted in the engine compartment, could emit hydrogen if overcharged. Chevrolet installed special battery caps and hoses that vented the battery to air outside the engine compartment, but these were often discarded by owners during the car's life. This air contamination problem is illustrated by the fact that many American cities' taxi regulations had prohibited air-cooled engine cars from being used as taxicabs when they derived their heated air from engine exhaust heat, decades before the Corvair and VW Beetle entered the market. The Corvair engine's cooling fan was on top of the engine. The fan and generator were operated by a belt on the rear of the crankshaft. The criticism was the belt had to turn around two 90° pulleys, each twisting it sideways.

Steering column (1960-1965 models)

A criticism in Ralph Nader's 1965 book concerned the steering column design. Like most cars of its era, the Corvair's steering column was rigid and could impale the driver in a front-end collision. While the Corvair's steering box was mounted ahead of the front cross-member, it was well behind the frame horns, in what would later be called a "crumple zone", and could, in a severe front-end collision, push the steering column and steering wheel toward the driver. In practice, most driver chest injuries were sustained due to the lack of a shoulder belt, rather than steering column intrusion. Any increase in risk of injury due to steering column intrusion in a front-end collision was, however, more than offset by the absence of an incompressible engine and transmission in the front of the vehicle, which commonly intruded into passenger compartments on vehicles of the era. Chevrolet, aware of Nader's criticism, changed the steering shaft to a two-part design with a frangible joint late in the 1965 model year, and a collapsible steering column was provided in 1967, towards the end of the model's life span.

Production notes

Year	Production	Base Price	Notes
1960	253,268	Template:USD	500 and 700 4-door sedan are only models available at introduction; 500 and 700 Club Coupe become available January 1960, Monza Club Coupe introduced spring 1960 with Template:Convert "Super Turbo Air" high performance engine option, and 4-speed transmission, gas heater optional, spare tire mounted in luggage compartment, central automatic choke. Sales impeded by U.S. Steel strike shortly after introduction, causing a shortage of new 1960 models. Monza is the first Chevrolet model with 'narrow' Template:Convert stripe whitewall tire.
1961	337,371	Template:USD	Lakewood station wagon, Greenbrier, Corvan, and Loadside and Rampside pickups added; 145 in³ engine and optional three-speed manual; spare tire now rear-mounted on models not equipped with mid 1961 All Weather Air Conditioning option. Manual choke. First full year of Monza production demonstrates its sales success, pushes Ford to develop Falcon Sprint and eventually Mustang to exploit the small sporty car market uncovered by Corvair Monza.
1962	336,005	Template:USD	Monza Convertible and Turbocharged Monza Spyder added mid-1962, heavy duty suspension optional with front anti roll bar, rear axle limit straps, positraction differential, new Monza full wheel covers, Kelsey Hayes knock off wire wheels added to options, Monza wagon becomes available, 500 wagon dropped- wagons lose 'Lakewood' designation. Station wagons discontinued mid-1962 to provide capacity for other Corvair and Chevy II models.
1963	288,419	Template:USD	Self adjusting brakes and small engine improvements (belt guides, improved oil cooler), new Monza rocker moldings, Loadside pickup discontinued.
1964	214,483	Template:USD	Larger 164 CID engine, improved rear suspension with added transverse leaf spring and revised coil springs, front stabilizer bar added as standard, finned rear brake drums, new optional full wheel covers-std. for Monza with specific centers, new Monza chrome rocker and wheel opening moldings, last year for Rampside pickup.
1965	247,092	Template:USD	Major redesign of the Corvair- all new Fisher Z body, hardtop styling for all models, 700 series discontinued, Corsa series replaces Monza Spyder series as 11th hour change; Greenbrier discontinued mid-year after 1528 built; revised front and redesigned fully independent rear suspension, improved heater and air conditioning systems, numerous small engine and chassis refinements. Mid year introduction of Z17 'steering and suspension" option includes special springs with rates increased approximately 25%, special shock absorbers, a 16:1 steering box and special steering arms. New options include Template:Convert engine, telescopic steering column, AM/FM, FM stereo, heavy duty oil bath air cleaner precleaner system with engine shrouding for dust control. Front Chevy emblem painted red.
1966	109,880	Template:USD	Improved 3 and 4-speed synchromesh manual transmissions; last year of Corsa model, Last year of Canadian production at Oshawa. Late 1965 modification to steering shaft adds a U-joint and floor reinforcement to reduce risks of column intrusion in collisions. Tire size upgraded to 7.00-13 from 6.50-13, with narrower Template:Convert whitewall. New "spoke" style wheel covers for all models with specific model centers. Front Chevy emblem now blue (remaining this color until the end of production). New optional equipment includes headrests, shoulder harnesses, 4-speaker Delco FM Stereo Multiplex, power rear antenna, 'Mag Style' (N96) wheelcovers.
1967	27,253	Template:USD	Last year for the four-door hardtop sedan, GM Energy Absorbing steering column, dual circuit brake system, stronger door hinges introduced. Template:Convert engine is only optional engine at introduction; eventually Template:Convert becomes available as Central Office Production Order in limited production as COPO 9551"B". New "safety" Powerglide shift knob, shoulder belt mount points added. New style standard hub caps for 500. Chrome ring inside taillight lenses widened. New options included Speed Warning, Delco Stereo Tape system.
1968	15,399	Template:USD	Air Injection Reactor standard in all markets, Template:Convert engine reintroduced as a regular production option, optional All Weather Air Conditioning discontinued, multiplex stereo option discontinued; fuel vapour return line and Ignition Key Warning buzzer new standard features. Front shoulder harnesses become standard after Jan 1, 1968, rear shoulder harnesses are optional all models. Side marker lights (clear in front with amber bulbs, red in rear) added to fenders on all models. New padding around central section of dash; thicker padding on top of dash, steering wheel spokes on Monzas now brushed aluminum (instead of chrome).
1969	6,000	Template:USD	Last year—production through May 1969; 521 Monza Convertibles of 6000 Corvairs produced; minor changes; improved clutch cable design on manual transmission cars, wider bucket seats with new head restraints, wider interior mirror, refined front brake hose design, Front side markers now feature amber lenses and clear bulbs (opposite from '68). Template:Convert engine, F41 'special purpose suspension', N44 'quick ratio steering box' Positraction and telescopic steering column remain available. Interior window handles featured clear-colored knobs. Deluxe steering wheel option discontinued. The last few months of production cars were hand-built on a special off-line area of the Willow Run plant.
Total	1,835,170

Stillborn third generation

Chevrolet had a proposed a third generation (1970-on) Corvair, essentially a re-skin of the 1965-69 model resembling the 1973 GM A Body intermediates, particularly the 1973 Pontiac Grand Am, retaining Corvair proportions. Having passed the point of full scale clay models, Chevrolet stopped developing the model in early 1968. Unlike the Turbo Hydramatic 400, the Turbo Hydramatic 350 transmission, introduced in the 1968 Camaro and later adopted by most Chevrolet models had been configured for use in the third generation Corvair.

Concept cars

File:Corvair Monza GT.1.jpg

Corvair Monza GT Concept

The Corvair spawned a number of innovative concept vehicles including the Corvair SS, Monza GT, Monza SS, Astro III, and even two Corrozzeria Pininfarina "Corvair Speciale" show cars. The Chevrolet Corvair Monza GT coupe toured together with the Monza SS (Spyder) in early 1963, making a further public appearance at the New York Auto Show. Although both cars were based on the Corvair drive train, each represented a futuristic development of the adaptable Corvair design. In the SS convertible, the engine (with a four-carburetor setup) was left in its stock location behind the transaxle, allowing a shorter (Template:Convert) wheelbase. Although the SS came very close to production, both cars remained concepts only. The Monza GT is housed at the GM's Heritage Center in Detroit. Template:Clear

Racing and modified Corvairs

From the first appearance of the Corvair, a large selection of high-performance equipment and modifications became available for it. Many sports car purists were more interested in the Corvair (particularly the 1965 and later cars) than in more conventional designs, such as the Ford Mustang, despite the latter's power advantage.

Yenko Stinger

File:1965 Yenko Stinger.jpg

A 1965 Yenko Stinger in a vintage race at Watkins Glen International.

Don Yenko, who had been racing Corvettes, could not compete successfully against the Carroll Shelby Mustangs after they arrived on the scene; he therefore decided to race modified Corvairs, beginning with the 1966 model. As the stock Corvair did not fit into any of the SCCA categories, Yenko had to modify four-carburetor Corsas into "sports cars" by removing the back seat; in the process he would introduce various performance improvements. As the SCCA required 100 cars to be manufactured to homologate the model for production racing, Yenko completed 100 Stingers in one month in 1965. Although all were white, as the SCCA required for American cars at the time, there was a great deal of variety between individual cars; some had exterior modifications including fiberglass engine covers with spoilers, some did not; some received engine upgrades developing 160, 190, 220, or 240 hp (119, 142, 164, or 179 kW). All were equipped by the Chevrolet factory with heavy duty suspension, four speed transmission, quicker steering ratio, positraction differentials (50 with 3.89 gears, and 50 with 3.55 when Chevrolet dropped the 3.89) and dual brake master cylinders (the first application of this by Chevrolet, to become stock equipment the next year). The Stingers competed in Class D Production, which was dominated by the Triumph TR4, which was very quick in racing trim; however in its first race in January 1966, the Stinger was able to come in second by only one second. By the end of the 1966 season, Jerry Thompson had won the Central Division Championship and placed fifth in the 1966 Nationals, Dick Thompson, a highly successful Corvette race driver, had won the Northeast Division Championship, and Jim Spencer had won the Central Division Championship, with Dino Milani taking second place. The next year, however, Chevrolet dropped the Corsa line, and the Monza line was not initially available stock with the four carburetor engine; the engine was eventually offered as a special performance option, however, along with the 3.89 differential. The Monza instrumentation did not have a tachometer or head temperature gauges, which had to be separately installed. The SCCA, on the other hand, had relaxed its ruling regarding color, and the cars were available in red or blue. It is believed that only fourteen 1967 Stingers were built, but Dana Chevrolet, who distributed Stingers on the U.S. West Coast, ordered an additional three similar cars to be built to Stinger specifications, but with the AIR injection system to meet California emissions laws, with Yenko's permission. A total of 185 Stingers are believed to have been built, the last being YS-9700 built for Goodyear Tire and Rubber Company as a tire test vehicle in 1969–1970. Comedian, television star, and car enthusiast Tim Allen owned and raced Yenko Stinger #YS-043 until he sold it around June, 2009.

Fitch Sprint

Longtime roadracer John Fitch was particularly interested in the Corvair as the basis for a spirited road and track oriented car, due to its handling. The basic Sprint received only minor modifications to the engine, bringing it to 155 hp (116 kW), but upgrades to the shock absorbers and springs, adjustments to the wheel alignment, quicker steering ratio, alloy wheels, metallic brake linings, the obligatory wood-rimmed steering wheel (leather available for an additional $9.95) and other such minor alterations made it extremely competitive with European sports cars costing much more. Body options such as spoilers were available, but the most visually remarkable option was the "Ventop", a fiberglass overlay for the C-pillars and rear of the roof that gave the car a "flying buttress" profile. Fitch went on to design and build a prototype of the Fitch Phoenix, a Corvair-based two-seat sports car, superficially resembling a smaller version of the Mako Shark based Corvette. With a total weight of 1,950 pounds (885 kg), even with a steel body, and with the Corvair engine modified with Weber carburetors to deliver 175 hp (130 kW), the car delivered spirited performance for $8,760. Unfortunately, the Traffic Safety Act of 1966 placed restrictions on the ability to produce automobiles on a small scale; this was followed by Chevrolet's decision to terminate production of the Corvair, which confirmed the end of Fitch's plan. He still retains the prototype however, and occasionally exhibits it at car shows. The car may be glimpsed briefly in the documentary film Gullwing at Twilight: The Bonneville Ride of John Fitch.

V8 Corvairs

The ultimate Corvair modification was replacement of the engine with a V8. As daunting as this might seem, two things made it possible:

1. The Corvair engine rotated in the opposite direction from most other engines, so that if a V8 was placed in the rear seat area (the added weight of a V8 in the original location of the Corvair engine would be abominable to drive without proper suspension modifications) and coupled to the front of the transmission via a supplied custom made clutch gear and input shaft, this would drive the car in the proper direction with four speeds forward and one reverse.
2. The switch in 1966 to using standard Chevrolet Saginaw gear sets in the manual transmission could handle the torque of a V8.

A radiator occupies the former trunk, in the front of the vehicle. However, the former engine compartment in the rear now is available as luggage space. A complete kit to adapt a Chevrolet small-block V8 to a Corvair was manufactured by a company named Crown Manufacturing, for $600. The resulting vehicle weighed only 2,750 pounds (1250 kg), compared to 3,700 pounds (1680 kg) for a small block Corvette, and possessed independent rear suspension of almost the same design. Crown's prototype with a 350 hp (261 kW) Corvette engine recorded a quarter mile (402 m) elapsed time of 12.22 seconds and 105 mph (169 km/h). An advantage of this modification is that the mid-engine design provides optimal handling characteristics for the road, as well as excellent drag strip traction without the need for slick or "cheater slick" tires as seen in front engine cars, let alone modifying the wheelbase as on the FX funny cars of the time. Although a few Corvairs have been modified to accept the Chevrolet big-block engine, the added size of the engine makes the work significantly more difficult, and the result, although a great performer, tends to be unreliable. Yenko Corvair YS99 was one of the 300 or so CORV8 conversions made. It is also possible to install a reverse rotation small block chevy in place of the flat six with many modifications.

Eshelman Golden Eagle

The first Eshelman Golden Eagle was an ordinary mid-1960s Chevrolet Corvair retrimmed with special emblems and other ornamentation and marketed through used-car dealers by Eshelman Motors Corporation of Baltimore, Maryland. By 1967, the model was called the Eshelman Golden Eagle Safety Car and was based on the contemporary Chevrolet line, but now each Golden Eagle had a patented standard Template:Convert impact-resistant "crash absorber" fashioned by incorporating each car's spare tire into the front bumper. Advertising claimed the cars were "Designed for the owner who has a special value for his life and the lives of his loved ones." Known Golden Eagle dealerships included the former Kislack Kar Sales in Houtzdale, Pennsylania and Plaza Motors in Niagara Falls, New York, but exact sales numbers are not known.

Dune buggies and aircraft

Corvair flat-six engines were a popular alternative to Volkswagen engines in dune buggy applications, and off-road racing. Some Corvair engines have also been used to power light aircraft.

Corvairs in popular media

• "Route 66", 1960–1964, TV Series - 1961 Chevrolet Corvair 4-Dr sedan is used by a character or in a car chase.
• "Voodoo Swamp", 1963, Movie - 1960 Corvair 4-Dr sedan is used by a character or in a car chase.
• "Bewitched", 1964–1972, TV Series - 1966 Corvair Corsa convertible used by a character.
• "Midnight Cowboy", 1969, Movie - 1960 Corvair 4-Dr sedan is used in a short scene.
• "Earthquake, 1974, Movie - 1964 Corvair Monza convertible is used by a character.
• "The Outsiders", 1983, Movie - 1965 Chevrolet Corvair Monza coupe is used by a character or in a car chase.
• "Fear", 1996, Movie - David McCall played by Mark Wahlberg drives a green Corvair convertible.
• "Mr. Holland's Opus", 1996, Movie - Glenn Holland played by Richard Dreyfuss owns an early blue Corvair Monza coupe.
• "Godzilla", 1998 - Dr. Niko Tatopoulos played by Matthew Broderick uses a Greenbriar van while studing radioactive earthworms in Russa.

Gallery

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See also

• Chevrolet Corvair engine
• Chevrolet Corvair Powerglide
• Yenko Chevrolet
• Unsafe at Any Speed

References

Bibliography

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• Cheetham, Craig. The World's Worst Cars : From Pioneering Failures to Multimillion Dollar Disasters. New York: Barnes & Noble, 2005. ISBN 0-7607-6743-2.
• Shattuck, Dennis, ed. Corvair- A complete Guide (A Car Life Special Edition). Chicago: Bond Publishing Company, 1963.

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External links

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• Motortopia: Assassination of the Corvair and Birth of a Classic
• CORSA home page — Corvair Society of America
• Rearviewed: Cruising the Streets with a Chevrolet Corvair Monza
• Online Corvair Information & Resource Portal
• Corvair Club Germany
• Rear Engine Specialists — Corvair History and Customization
• Corvair Autocross and Racing pages by Bryan Blackwell
• Conversion of the Corvair engine for aircraft.
• Filmstrip Advertisement for the Corvair from the Prelinger Archives at archive.org

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