1. drop the diaphragm end in some water (see next step for why)
2. heat the spring retainer gently with a propane torch to break the loctite seal
3. grab the centre of the valve with small needle nose pliers, larger pliers to wind off the spring retainer.
4. Adjust height of retainer, fiddle with springs and test, test, test until you find a vac rating that makes you happy.
5. reseal spring retainer with fuel resistant loctite, happy days.
*Unable to credit whoever originally posted it, it certainly wasn't me but I've done it a bunch of times over the years. It works really well.
Statistics: Posted by phill — Thu Jun 02, 2022 10:59 am
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Do you have an (approximate) number of turns per in.Hg?
Statistics: Posted by DrCharles — Tue May 31, 2022 6:15 pm
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Statistics: Posted by bigblockmark — Tue May 31, 2022 5:07 pm
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Statistics: Posted by DrCharles — Tue May 31, 2022 3:31 pm
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Statistics: Posted by rgalajda — Tue May 31, 2022 9:24 am
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Using a delicate spring against a rubber diaphragm to balance the very low force of vacuum seemed like a definition of insanity to me...
Rubber. Rubber that can be affected by petrol; that goes hard with heat; that goes hard with age. So not surprised to hear that a X.Y power valve has changed it's value.
Statistics: Posted by GTO Geoff — Sun May 29, 2022 6:24 am
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Idles around 13.8-14.2 AFR (not a steady reading due to the lumpy idle from the overlap). The exhaust already smells bad enough, I don't want to richen it more if I don't have to...
Cruise 14.5 @ 15" Hg.
This PV starts to open around 7-7.5" (it's clearly stamped 8.5!)
Fully open at more like 6", where the AFR drops rapidly to 12.5 and stays there as I keep opening the throttle more to stay at 5-6". That does not last long even in 4th gear
I know it's not a true bistable switch - it has to open far enough so that my relatively large .066 PVCRs are not restricted by the PV seat. Now I'm wondering how exactly PV ratings, even if accurate, are measured - where the valve starts to open? Or fully open?
Either way the one I picked does not seem to be quite rich enough. Time to try the (alleged) 9.5" I guess!
Statistics: Posted by DrCharles — Sat May 28, 2022 8:00 pm
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