Ruptured powervalve diaphram

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08-31-2008, 02:21 AM
valvebounce

Ruptured powervalve diaphram

I have a holley on my supercharged engine. I've externally referenced the powervalve, as you do. She's been parked up for a few months, and I took it out today, and went over to my workshop to do the exhaust. It seemed to run poorly at cruise throttle, and didn't want to idle. But would sweeten up (Somewhat) when accelerating. (On boost)
I pulled into the drive, and it was running like a bag of @#$%. I pulled the spark plugs to see how they looked. The first two were textbook perfect. The second two were as black as your hat. (It's an inline four) I couldn't see how two plugs could be black, and two not. Then I twigged that the vacuum feed to the powervalve comes from the runner to the rear two cylinders. I pulled the hose off, and found that there was gas in it. I plugged the hose at both ends, and it started running right.
It's no big deal to stick in a new powervalve, but I'm poor, and don't want it to happen again.
Whats the fix to prevent powervalve failure? I don't want to give it WOT without the enrichment of the powervalve, so I needs to be fixed. Also the valve that's in there is only a few months old.
08-31-2008, 05:02 AM
pat mccarthy

plug it jump up ten jet sizes
08-31-2008, 06:10 AM
moter

http://store.summitracing.com/partde...5&autoview=sku

try this...plus its cheaper than a power valve
08-31-2008, 10:52 PM
valvebounce

Does that go into the powervalve signal port in the carb's baseplate? My port is plugged, and has a signal hole in the side of the baseplate. I have a non return valve I could fit to the line, but then the vacuum couldn't escape either and the valve couldn't open.
09-01-2008, 05:32 AM
pat mccarthy

Quote:

Originally Posted by valvebounce

Does that go into the powervalve signal port in the carb's baseplate? My port is plugged, and has a signal hole in the side of the baseplate. I have a non return valve I could fit to the line, but then the vacuum couldn't escape either and the valve couldn't open.

to work you wound have to buy the check valve unplug your hole for vac signal.and not use your line your pulling from your intake base. i just would plug the power valve and jump up your size on jets i use the power valve plugs on blower engines it works for me
09-03-2008, 02:32 AM
valvebounce

My engine is too small to run that rich a main jetting. Maybe I could fit that valve inside the hose that supplies my vacuum signal. I was planning to stick the wideband A/F meter on it again, and lean my baseline right out. Then increase the size of the powervalve restrictor orifices, to get a suitably enriched mixture for wide open throttle conditions.
It's only a 2300, so I don't have the benefit of secondaries for WOT enrichment.