Fuel-Injection Woes

18 Май 2015 | Author: | No comments yet »
Toyota 1957 Sports

Carbs versus fuel

Originally published in Sports Illustrated magazine in June

During the runs with the car, we were looking for flat spots—the transition in fuel/air metering that are among the defects of the carb-fed, than injected, engine. were none. The beef in the FI permits you to take off from in top gear just by revving up to or so and letting the clutch out slowly. Our to 60 (actual) time in top gear was 13.8 seconds. Then we the engine down to its smooth-running in top gear, 14 mph, and accelerated both full and partial openings. There was no faltering, were no flat spots. was generated smoothly and at an increasing until about 2800 rpm the cam hit its stride and the car hunkered down and into the distance. Elapsed for 14 to 60 mph in high was 12.3 seconds, on the machine.

The same continuous flow of held good during cornering and braking. Under conditions with the dual-quad the contents of the carb float were slung away their intended orifices and the engine gasping for fuel. was no trace of this with the FI which feels as though it be driven upside down.

In all the recent prophecies concerning FI, been assured that economy will be improved. In tests, the FI version registered as as 15 percent better gas mileage—in of a lower gear ratio. of this gain is due to the FI job’s compression ratio. In spite of the compression our test car’s did not detonate even when heavily in top gear.

In the U.S. far more interest is in cars’ sheer performance in their fuel economy and we normally restrict our fuel figures to averages obtained in running. But because of the novelty of FI and of the fuel consumption claims for it, we ran precise fuel checks at speeds, using a Donat 1/10-gallon fuel-measuring burette. The good results for so potent an are shown in the data table. suggest the fuel economy possible if you should choose to one of these injected cars which is not the kind of use they’re for. More important, indicate the improved operating that can be expected when FI become sufficiently inexpensive to be to normal touring cars.

To get more expert opinion our own on Chev’s FI, we turned our test car to racing FI specialist Stuart asking that he drive it and frank comment. This was first behind-the-wheel encounter Chev FI and he gave the car a careful, workout. Then he said, good. All I can find to criticize is its behavior and its complexity.


As an addendum to the performance figures and to the comparison curve from our Corvette test, we might the net horsepower ratings of the two 1957 tested—in other words, the output at the clutch with all leads subtracted. The injected delivers 240 bhp at 5600 rpm, the dual-quad rig turns up 230 bhp at 6000. year’s Corvette engine was modestly rated at 225 horses, so the this year is just you’d expect from an 18 cubic inches.

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