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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.
In SU and other (e.g. Zenith-Stromberg) variable jet carburetors, it was mainly controlled by varying the jet size. The orientation of the carburetor is a key design consideration. Older engines used updraft carburetors, where the air enters from below the carburetor and exits through the top.
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.
It was succeeded by the Motorcraft 2150 carburetor. Size is determined by the diameter of the venturi. This can be found cast into the float chamber side. It will be a number in a circle, with the number being the venturi size in inches.
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 ...
Kenny Loggins had a run of successful singles in the '80s, when he was known as the "King of the Movie Soundtrack." His 1984 No. 1 hit, "Footloose," from the movie of the same, was one of the ...
The basic carburetor size can be selected by the butterfly valves, for DCO/DCOE the sizes are 38/40/42/45/48/50/55, with 40/45/48/50/55 being more common and available today. Jet size is based on choke size, and choke size is just based on engine displacement, RPM and application.
A larger 4 in (101.6 mm) ram air flex duct to the air cleaner from the left-hand fender, specific carburettor calibration for the Rochester Quadrajet, a "T/A 4.9" callout on the shaker, 60 psi oil pump, and cam similar in grind to the 220 hp (164 kW) 400 from the 1978–1979 model year were also included.
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