At 07:37 PM 5/10/2016, Scott wrote: >lol..as far as I'm concerned ...like in engine air intake ....the piston >going down is SUCKing in air .. >Sucking .. >just like the cooling down coolant Sucks coolant back into the pressure >bottle. We think that way because we're surrounded by air and have to press against it to make little pockets of vacuum. If we were surrounded by vacuum instead it would be pretty clear that the pressurized air is pushing its way in. It's all a matter of context. We look at the fuel pressure regulator and think that it's changing the pressure in the fuel ring, because we measure it relative to atmospheric pressure. But the fuel injector thinks that the regulator is keeping the pressure exactly constant, because its reference is the inside of the intake manifold, and the regulator keeps the pressure at a constant offset from whatever the intake manifold pressure is. If you put a pressure gauge in a sealed box and connected the box to the FPR vacuum line you'd see that it's really keeping the pressure constant so that the injector will always inject the same amount of fuel for a certain number of milliseconds of open time, no matter what the engine is doing. Yrs, d |
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