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914World.com _ 914World Garage _ Cylinder Compression Issue

Posted by: rickso71 Jun 30 2005, 10:24 PM

What are normal compression numbers?

1.7L engine was re-built by PO but was never started. Tonight I adjusted the valves (he'd left them very loose) and checked cylinder compression... about 90 lbs. except #1 only 70 lbs. Hoping I have a valve that's just sticking a bit and it will loosen up after running a while?

Posted by: scruz914 Jun 30 2005, 11:21 PM

I am guessing that you need to run it for a while to seat the rings before the compression comes up. How long ago was the engine rebuilt? Hopefully the PO didn't leave the cylinders dry and let them rust.

-Jeff

Posted by: rickso71 Jul 1 2005, 08:14 AM

THe engine has signs of oil around the intake, exhaust valves, etc. so I'm pretty sure he left it lubed up. I'm thinking the same thing,... run it for a while to seat everything. Not sure when it was rebuilt but was at least three years ago.