dean.psiropoulos(at)veriz
Guest
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 Posted: Sat Aug 04, 2012 8:20 pm Post subject: Engine power loss |
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I had a problem with a bad idle on my AFP injected parallel valve 0-360
Stan. After 5 months of trouble shooting I discovered that the flow divider
(on top of the engine) was sticking. How I figured that out was to tee in a
mechanical pressure gauge between the servo and the flow divider (not at
fuel pump outlet, you won't get accurate readings there). You'll need one
calibrated with a 0-10 PSI range. I ran a hose up to the canopy from the tee
and connected it to the gauge there so I could see the reading from the
cockpit. Then I started the engine and watched the gauge while I was
advancing the throttle. The engine stumbled and the pressure reading went a
couple PSI above where it should have been before dropping back and acting
normally (ie. going up and down with throttle movement). After consulting
with Don Rivera at AFP the conclusion was a sticky flow divider so I
returned it to him for repair. The engine ran like a top after it was fixed.
Another friend with a Bendix system found a small piece of black tape
plugging up one of the fuel ports in his flow divider but that was during
first run when one EGT showed a cold cylinder (so much for the integrity of
FI rebuilders). After that was fixed it still ran a bit rough and when he
did the flow matching test (with the 4 cups under the injectors) he found
one somewhat constricted. So he soaked that injector in Hoppes gun cleaner
and viola, engine runs great. Troubleshooting the fuel system can be very
frustrating. By the time I finally figured out the flow divider problem I
was so disgusted that I had started to look for a Marvel carb. And I'm a
pretty patient guy.
Dean Psiropoulos
RV-6A N197DM
FL to Indy 2012 without a hiccup
__________________________ Original Message _____________________________
Subject: Help me solve engine power loss
From: speedy11(at)aol.com
Engine gurus,
.. On takeoff roll there seems to be slightly less power, but the power
loss is more noticeable (approx 20% loss) once airborne. At pattern
altitude with reduced power the engine runs ok. But as I add throttle
(high RPM on prop) the engine loses power as if it is loading up. The
EGTs and CHTs are normal. The RPM and MP are normal.
Stan Sutterfield
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