Roush Propane Racer Development Engine
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The 5.4-liter development engine achieved its 620-plus horsepower on just one injector per cylinder (running at about 85-percent duty cycle), however the propane project's whole fuel system has been sized to support up to 1,000 hp, thus explaining the twin-injector setup. It will all be controlled via the car's FAST XFI processor, obviously having propane-specific calibration. View Related Article
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