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The Quadrajet is a four barrel carburetor, made by the Rochester Products Division of General Motors.Its first application was the new-for-1965 Chevy 396ci engine.Its last application was on the 1990 Oldsmobile 307 V8 engine, which was last used in the Cadillac Brougham and full size station wagons made by Chevrolet, Pontiac, Oldsmobile, and Buick.
The final Chrysler use of four-barrel Carter carburetors was the Thermo-Quad, which used a lightweight thermoplastic float bowl, on the most powerful Chrysler engines. [1] Carter produced Rochester Quadrajet carburetors for their rival maker whenever demand outpaced Rochester's ability to make them. They were identical to Rochester's units ...
The combination of good torque at low engine speeds, the Quadrajet four-barrel carburetor, and the THM-200-4R three-speed plus overdrive automatic transmission having a lockup torque converter allowed for decent performance, and fuel economy considered reasonable for the era, even in the larger and heavier model cars. The engine is also known ...
The Quadrajet became computer controlled in 1980 in California and in 1981 in the rest of the states; its last application was on the 1990 Cadillac Brougham and 1990 full size GM station wagons with the Olds 307 engine. [citation needed] RPD was a pioneer in fuel injection systems in road cars in the 1980s.
Power output dropped to 145 hp (108 kW) at 3600 rpm and torque to 270 lb⋅ft (366 N⋅m) at 2000 rpm in DEFI forms as used on the front-wheel-drive Seville and Eldorado but 150 hp (112 kW) on the four-barrel Quadrajet-equipped RWD models. This engine was standard on all Cadillacs except the redesigned Seville, in which it was optional.
The Tri-Power carburetion system was replaced with a single 4-barrel Rochester Quadrajet carburetor. The 389 cu in (6.4 L) engine received a larger cylinder bore 4.12 in (104.6 mm) for a total displacement of 400 cu in (6.6 L) V8, which was available in three models: economy, standard, and high output. The economy engine used a two-barrel ...
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