I have done compression tests before but want to make sure I am really doing it right.
(Did a serach but didn't get a clear answer).
Do I do the test with the engine warm or cold?
When warm, I get ~165# across the board.
If I try it cold, I get next to none! The reading drops almost immediately. Can't get a good seal with the gauge when cold?
Should I do the oil in the cylinder test when cold? Or could the pistons and rings need to be warm to seal?
I am using a lot of oil and the plugs are fouling badly. I am pretty sure my valve seals are gone from the smoke at start up and decelleration. It also will smoke when I get on it hard, but only if it's been running at low speed or idling for awhile. Then it stops smoking.
Could the fouling and smoking be primarily from valve seals?
I'm planning on rebuilding this winter, but if I could slow down the oil use by replacing seals, I'll try it.
I have a crankcase evac system to the headers and the hose is pretty oily so I think I'm sucking oil out as well.
I have about 90# of oil pressure, so I think I'm flooding the valve seals too.
Sorry for the long post but wanted to get the facts out.
Thanks in advance!
69 396 w/SS Trim
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