Posted by Steven f/AZ on May 12, 2008 at 12:48:46 from (216.67.213.217):
In Reply to: Oil pressure posted by mkirsch on May 11, 2008 at 18:10:35:
First, put a REAL, numbered gauge on it and see what you actual pressure is. General rule of thumb is 10psi per 1000 rpm. So if your Cub manages 15 to 20 psi hot, you're fine.
The comment about an engine not holding 60 psi all day is wrong - oil pressure has NOTHING to do with how the seals of an engine perform. Seals are not under pressure at all. My H will hold 75 psi at full throttle all day with 5w-40 oil in it, drops down to 50 psi at idle when hot. The pressure relief valve on H's and M's, etc. is set for 75 psi. I'm not sure what the relief valve is set for on a Cub.
Again, if you have 15 to 20 psi at full throttle, you are fine. At idle, you don't need any oil pressure - just volume, so as little as 2 or 3 psi at idle is fine.
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