Inliners International Forums General Discussion Engines 292 Compression in PSI's

I just have a quick question. Can anyone tell me what the PSI numbers should be when running a compression test? I just checked my newly rebuilt 292 today and I'm reading about 120psi on all cylinders and I know that the comp ratio should be somewhere around 8.5:1 on a moderately modified block like mine but I can't find any info on the actual PSI's. Thanks -Tim "Doc"

Dear Tim;

That's just fine.

The main thing is; there even, which is what you want.

All is well.

The factory manual says 130#, but I'd go along with what John says for now.

Larry

Thanks John and Larry, That helps alot. I'm trying to keep a log of all the work that I've done including all readings such as Vacuum at various RPM's, Oil Pressure at various RPM's, Compression, etc. Sort of a bench mark. I've measured, remeasured, torqued and retorqued, pre-oiled and pre-loaded everything after first asking and double checking everything and everyone along the way. I wish that I had discovered the Inliners about two years ago! I must have done something right when I put it together, I'm pretty surprised at how long it will hold these PSI's even after it's shut down. Thanks again guys, -Tim

Cranking pressures will vary depending on the camshaft and valve adjustment. You are looking for all six to be the same. So yours being 120# is just fine. I had a 12.5 to 1 race motor that only had 130# cranking pressure due to the cam overlap. Joe

Dear Tim;

I should come up a little when It's 'broke in' etc.

Happy trails,

Thanks John,

Also, it seems as though the timing gears whine a little (not much) is that normal during the "break-in" period? They're a stock-type Cloyes matched set. -Tim