Quote:
Originally Posted by UFO
And I own and modify that same Z car. And I can say with 100% certainty this very common fuel system maintains a constant fuel pressure across the injector. So a duty cycle of x% represents the same fuel flow at a particular rpm regardless of engine load.
Reference your fuel pressure gauge to the manifold and you will see what I mean.
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I have heard the same statement for other sources. It's been a while since I worked on them.
My memory was the pressure range was 32-40 PSI, with pump pressures of 65PSI.
Maybe I am not following your logic correctly but with atmospheric pressures ranging from say 26.99 (cat 5 hurricane) to 31 (seriously high pressure cell at sea level), I can't follow the logic that the range differential in pressure at the injectors follows the range of available air pressure into the cylinders.
With vacuum readings of 20-22 inches, your range of available air pressure to the cylinders would be 4-9 inches (depending on atmospheric pressure) and 26 to 31 inches at WOT.
Maybe my math is rusty but that would be hard to match perfectly with a range of 8 PSI at the injector, but I am always open to additional learning
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Here is my 76 280 at the National Convention in Knoxville 1992.
regards
Mech