Donlon39 said:
Your crankcase is being pressurized by compression blowby, which is forcing oil through the main seal or around the too limited seating for the seal.
A leakdown test will confirm this diagnosis. See:
http://www.harborfreight.com/catalogsea ... own+tester $39.95
Prior to the development of the molded lip seal, engines relied on a tight compression ring seal and gravity to retain crankcase oil.
And it worked.
Frank Forster
Yeah, might be, simpler to just stick a reed valve on it, since you want one anyway, even on an engine that has zero blow by. I mean, we have 750 or 850 or even 900ish ccs of pumping pressure on every down stroke, the same on the up stroke of course, lets net a vacuum out of it. Lemonade from lemons.
