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1975 Cosworth Vega Cosworth Vega Interior. All 2,061 1975 Cosworth Vegas were finished in black acrylic lacquer with gold "Cosworth Twin Cam" lettering on the front fenders and rear cove panel and gold pinstriping on hood bulge, body sides, wheel openings, and rear cove. (Black was unavailable on other Vegas until mid-1976.)
The Chevrolet Vega is a subcompact automobile that was manufactured and marketed by GM's Chevrolet division from 1970 to 1977. Available in two-door hatchback, notchback, wagon, and sedan delivery body styles, all models were powered by an inline four-cylinder engine designed specifically for the Vega, with a lightweight, aluminum alloy cylinder block.
The Cosworth Vega engine was produced in 1975 and 1976 using the 2300 engine block. The engine was de-stroked to 3.16 inches (80 mm) giving 2.0 L; 121.7 cu in (1,994 cc), with a 16-valve aluminum cylinder head, double overhead cams ( DOHC ), forged components and solid lifters .
The Pontiac Astre is a subcompact automobile that was marketed by Pontiac as a rebadged variant of the Chevrolet Vega.Initially marketed in Canada for model years 1973–1974, the Astre debuted in the U.S. for the 1975 model year, competing with other domestic and foreign subcompacts that included the Mercury Bobcat, Volkswagen Rabbit, and Toyota Corolla.
An advanced design for the time, the Cosworth Vega engine used dual overhead camshafts, 4 valves per cylinder, and electronic fuel injection; in total, 5000 engines were assembled for 1975. [5] For 1975, the introduction of the Chevrolet Monza saw the introduction of V8 engines to H platform (not offered in the Vega and Astre).
The 1976 model was the introduction of Chevrolet's new 5.0 liter (305 CID) V8 engine with a two-barrel carburetor generating 140 horsepower (100 kW) at 3,800 rpm, but only for California and high-altitude Monza customers, and replaced the 350 V8.
One of the most successful and longest-lived projects of Cosworth has been its Indy car engine program. In 1975; Cosworth developed the DFX, by destroking the engine to 2.65 L and adding a turbocharger, the DFX became the standard engine to run in IndyCar racing, ending the reign of the Offenhauser, and maintaining that position until the late 1980s.
In the US, the name has also appeared in the title of a road car (well before it did in Europe) as the Cosworth version of the Chevrolet Vega. Only 3,508 1975 and 1976 Cosworth Vegas were produced from March 1975 through 1976. The engine features the Vega sleeveless, aluminium-alloy block fitted with forged components.