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You certainly could be right about that,
Rusty. My understanding was to expect the fuel pressure to vary to
compensate for the different manifold pressure. But, there is no
indication on my gauge and this is the second pressure regulator (but, of the
same make Hmmm) that I have had. It does regulate (else my fuel pressure
would be much higher) but apparently does not compensate for manifold pressure
based on what I am hearing.
But, as you indicated, If there is any
operational problem associated with it, I have not encountered it (or
recognized it as such). It is one of the smaller ones and it could be that
it is dumping all the fuel it can at 40-43 psi and there is not sufficient
return flow capacity to compensate for the variations in manifold
pressure. I suspect that if I had a turbo where the manifold pressure
varied considerably that the lack of such compensation might be more detrimental
to engine performance (and life). Just speculation of
course.
Ed A
----- Original Message -----
Sent: Saturday, January 22, 2005 8:50
AM
Subject: [FlyRotary] Re: Fuel Injector
Sizing
Actually, I have a manifold referenced
pressure regulator (which if I understand the concept) attempts to keep
the pressure differential between the fuel side and manifold side of the
injector constant. However, Varying engine manifold pressure (varying
throttle opening) does not appear to have any affect on my fuel
pressure. It sits rock steady at 40 psi with one pump and goes up to 43
psi with both running regardless of throttle position.
Hi Ed,
Sounds like your regulator isn't working like it's
supposed to, though I guess it isn't causing you any problems. A simple
test would be to run the pump with the engine off and note the fuel pressure,
then check it again at idle. If you really want to get fancy, and have
one of those Mity-Vac pumps, you can just vary the pressure signal to the
regulator with the engine off. My pressure definitely
changes.
Cheers,
Rusty (wonder if Tommy got his new regulator working
yet)
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