In 1955, Chevrolet fight a home run v its smartly restyled passenger dare (including the high-end Nomad wagon) and brand-new 265ci V-8 engine. In 1956, Chevrolet hit a cool slam with its Zora Arkus-Duntov-conceived 225 hp dual-quad engine. And, if we may proceed the baseball metaphor, they won the World series with the extremely styled "57 models, 283ci engine and also Rochester fuel injection that produced a then-amazing 283 hp.
Chevrolet Chief engineer Ed Cole"s desire to have actually the an initial practical fuel-injected engine in an American passenger auto was the driving pressure behind Rochester"s unit. In "55, that assigned Duntov the job of developing a brand-new fuel injection system. If Duntov it s okay high worship for his work-related on the Corvette, he constantly gave full credit to GM engineer man Dolza because that his outstanding work-related on the Rochester fuel injection system.
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The biggest advantage of fuel injection was no horsepower, but the capacity to distribution the fuel-air mixture equally to every cylinders. Traditional intake manifolds space designed v a compromise between low- and medium-speed driving. Due to the size of the runners, fuel mixtures have the right to vary as lot as 15-percent in between cylinders. Carburetors were also susceptible come fuel sloshing in tiny float bowls. This was specifically bothersome to those who road raced and would find their engine starved because that fuel after particularly hard turn and flooded after the next.
Rochester"s fuel injection system consists of three main components: the entry manifold/plenum (also know as the "dog house"), the fuel meter, and the air meter. The input manifold/plenum is the largest and most visible of the components. There space two piece to the manifold, a basic plate, i beg your pardon doubles as a valley cover (and because that the injector nozzles), and the actual plenum. The plenum"s project is to distribution air come the cylinders and serve together a mount because that the fuel meter and air meter.
Rochester"s engineers placed the fuel meter come the best side that the plenum. This little rectangular component contains a large fuel reservoir with a traditional float, needle and also seat, and a optimistic displacement high-pressure pump. A flex cable attached come the distributor cd driver this pump. It operation at half engine speed and also pressures vary from 7.2 psi in ~ idle to 530 psi at 6,000 engine rpm. The fuel native this pump is ceded directly to the nozzles.
The air meter is the third significant component of the Rochester fuel injection system. The is mounted on the left side of the plenum. The air meter measures, controls, and delivers the air offered in combustion. Its 3 main materials are the throttle valve, the diffuser cone, and the waiting meter body, which includes the Venturi.
The distributors on every Rochester fuel injected engines were unique to the application. All were a two-piece style with a tiny flex cable drive the spun the fuel pump in the fuel meter unit. In 1957, all early fuel injected cars, both 250- and also 283hp, were fitted with dual-point distributors through no vacuum development unit. Later in the design year, Chevrolet adjusted to a single-point distributor ~ above the 250hp engine with a vacuum advance. Between 1958 and also 1962, every high performance fuel injected engines used dual-point distributors there is no a vacuum advancement unit.
Driving a car with a Rochester fuel injection device is a distinct experience. When the accelerator is depressed over there is one instant and smooth response, unequal a carbureted engine, where there is constantly a definite readjust in the acceleration sensation as soon as the secondaries are opened. On any type of carburetor, that minute when the secondaries are around to open is constantly a complicated transition. With the Rochester injection, over there is no tip-in point, just smooth acceleration transparent the entire selection of the accelerator pedal.
At $550, the price for the fuel injection choice (same because that either the low- or high-horsepower version) on a "57 Chevrolet passenger vehicle was steep. But many to be sold, especially on the stylish Bel Airs and also Nomad wagons. Those ready to shell out the extra money were rewarded v the most progressed engine available in a production passenger car. Chevrolet readily available two injected 283s in "57: the hydraulic-cammed 250hp mill that can be donate by an automatic, and also the 283hp choice that required a hands-on transmission.
The "57 FI cars also displayed a overcome flags emblem and also fuel injection script on the fenders. These were the exact same emblems used on the FI Corvettes. This is the very first time the a modern-day manufacturer had included an exterior emblem that directly related come an optional engine ~ above a passenger car. Chevrolet had actually been using a "V" emblem since 1955 to represent a V-8 engine, however nothing to indicate the induction system. The fuel injection emblems top top the fender spoke volumes as soon as a new "57 Chevrolet rolled into a drive-in restaurant.
In 1958, Chevrolet rolled the end a auto that looked nothing prefer its "57 predecessor—it looked an ext Cadillac than Chevrolet. It to be longer, lower, broader and decked v chrome. Chevrolet again offered two fuel-injected version of the 283, both listing for $450, and also both were identical to the fuel injected engines in the "58 Corvette except for the wait cleaner and valve covers. The horsepower ratings to be 250 and now 290 for the solid-lifter version, even though the was the same to the 283hp version sold a year earlier.
To satisfy the demands of its widening truck line and also future cars, Chevrolet"s engineers developed an all-new engine for "58 that displaced 348 ci. Originally in 2 horsepower ratings: 250 with a solitary four-barrel carburetor, 280 through tri-power and also (later in the year) a 315hp high-performance tri-power version.
The buyer"s dilemma ended up being obvious: Why invest $450 because that a 290hp fuel-injected 283 when you can have the 315hp tri-power 348 for just $162? giving two V-8s could have been a marketing point versus Ford, but the internal intricacy it produced for Chevrolet and also the extra customer cost surely limited the order of fuel-injected engines in full-size Chevrolets.
In the late "50s race for bigger fins, Chevrolet went all-in v its gull wings and cat"s eye taillights. Power was tho a huge part of Chevrolet"s service plan and the two optional fuel injected engines (250 and also 290 hp) remained on the option list. But its cost and complexity driven potential buyers away. Those that were searching for performance could pick one the the several less expensive 348ci engines.
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Chevrolet didn"t market a fuel-injected engine for its passenger dare in 1960, however the FI option continued in Corvettes for years. In 1961, the last year for the 283, Chevy"s designers pulled a durable 315 hp the end of its FI engine. The addition of the 327 in 1962 allowed Chevrolet"s engineers to crank out 360 hp. In 1965, its last year as a Corvette option, the fuel-injected 327 created 375 hp—the high water note for the first-gen SBC.
While constantly overshadowed by big-block horsepower, Chevrolet"s Rochester fuel injection is just one of the cornerstone piece that comprised Chevrolet"s performance pyramid. And even today, a car with one of these Rochester units still has actually the capability to draw a group at a car show favor a hit in a schoolyard.