I recently read an article by Bill Lee from an old magazine. I believe it was about 1PSI with no check valve. 1.25 with. Doesn't sound like much, but it's still an increase! I may be wrong, however....
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That's pretty close, T.J.
What I wrote was
" ... a test stand to measure this and found that the tank
pressure from an untimed crankcase tap is about I.4
psi, or about 1.6 psi if a ball-check is used in the
pressure line."
Yes, this is crankcase pressure, not timed pressure, but what most folks would use.
Bill
ps; this may be found on the NCLRA website at
http://www.nclra.org/TechTopics/UniflowPhysics.pdf