Quote:
Originally Posted by KevinW
Thanks Robert. I'll need to locate a compression gauge, as the unit I have on loan only measures vacuum.
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You don't need a compression gauge to measure any form of crankcase pressure.
If the venting system is inadequate, pressure will only rise to a point where the lip seals on crankshaft etc will allow pressure release.
I have two low pressure gauges, one reads to 12 in. Hg, 160 in. water (vacuum), the other reads to 1 inch Hg, 13 inches water (pressure).
Anybody running a big engine with 3/8 vent hoses should be increasing the largest hose to 3/4 or even 1 inch. Large hoses flow more air in total, but slower at any point which helps keeps the
oil in the engine.
Gary