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Old 08-18-2006, 07:57 PM   #1 (permalink)
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Join Date: Apr 2006
Location: Vancouver, BC

Sheridan valve advice needed

I have a P-12 that is still giving me some valve issues. It has had a CA conversion added sometime during its long life, and I believe that this is the root of its persistent low velocities. I have it running at around 240, which is barely acceptable. This is with a pretty heavy bias towards the hammer spring, and a very heavy pump stroke. I have cut the valve spring down, and I have had to cut some of the cupseal valve stem down in order to allow the valve to open completely.

When I was looking at Palmer's selection of accessories and parts, I noticed the different valve stems for CA and cartridge powered guns. I have already cut most of the 12-gram piece pin down on my stem, and I now have comparable valve movement to my PGP. However, on Palmer's site, the CA stem has had nothing past the cupseal intact. Should I take this route and completely cut off the rest of the stem? I'm worried that nothing will guide the valve spring once this is done.
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