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In 1957 Chevrolet introduced their first fuel-injected engine, [12] the Rochester Ramjet high-performance option on Corvette and passenger cars at $484. [13] In 1956 Oldsmobile were also experimenting with Rochester fuel injection, at the GM desert proving grounds near Phoenix, but offered the Rochester triple-carburetor J2 option for 1957. [14]
In the late 1970s, the Chevrolet 200, Chevrolet 229 and Buick 231 V6 engines gradually replaced the 250 straight six in passenger cars in North America, with use of the engine discontinued after the 1979 model year. The 250 engine continued to be used in GM trucks until 1984, after which it was replaced by the 4.3 L V6 (essentially a 350-cubic ...
[citation needed] The digits in a Quadrajet model type denote its features. For example, the "E" at the end of a later Q-jet model denoted that it had an electric choke, the "C" denoted a hot air coil style choke element. Original Delco service kits were once sold through both GM dealers and Delco distributors and were called "Power Kits".
Rochester Ramject as seen on 1959 Chevrolet passenger car In the early 1950s, fuel injection was the topic of a significant amount of research by the auto industry in the US and internationally. Ed Cole , who had become the chief engineer of Chevrolet in 1952, pushed for Chevrolet to be the first GM brand to offer a fuel injection option on a ...
A 2.3-liter Quad 4 W41 engine. The W41 was the most powerful Quad 4. The 1991–1992 W41s were rated at 190 hp (142 kW), while the 1993 W41 was rated at 185 hp (138 kW) as a result of the first round of exhaust port size reduction to improve emissions and other changes to the Quad 4 architecture to reduce NVH.
In May 1963 a new injection system designed by Rochester was installed that produced nearly the same output as the Marvel-Schebler system. Performance of the most recent development engine was compared with a 4X1 140 hp (104.4 kW) engine on 5 November 1963; the injected engine produced approximately 14 hp (10.4 kW) more.
In 1966–1967, the 1-barrel was replaced with a 2-barrel Rochester 2GV, giving the engine a 5-horsepower boost to 160 hp (119 kW). The V6 was dropped after the 1967 model year in favor of a conventional 250 cu in (4.1 L) inline-six engine built by the Chevrolet division, and the tooling was sold to Kaiser-Jeep.
In 1986 and 1987, the 4.3 L (262 cu in) engine saw engine design upgrades similar to the Chevrolet small block V8. In 1986, the rear main crankshaft oil seal was changed from a two piece to a one piece seal. Some 1985 model year vehicles would have a 1986 engine due to service replacement – cylinder blocks were shipped with oil pans.
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