compression

[Rambo24o]

Hello I just finished compressing my CA and I got 125psi on all four is this acceptable? Or do I need new rings?

[chalander]

I don't know but for reference, my ca18det tested 145-150 on all four cylinders

[float_6969]

That's super low. Did you warm the engine up first, or was this cold? Did you hold the throttle plate open while you were cranking? Did you have all of the plugs removed so that it would turn over as quickly as possible? My compression is around 200psi on a brand new engine, but that's running custom forged DE pistons, which have a dome on them.

[boost_boy]

It's been runing stupid rich, so I wouldn't be surprised if "rinse down" hasn't worn those rings out. I would try a different compression tester before determing that the engine is indeed in need of servicing. To confirm that it is the rings, pour a few ounces of fresh motor oil into each cylinder that you test. Remember to only pour the oil into one cylinder at a time; meaningonly pour the oil into the cylinder that you are going to test and repeat the process for remaining cylinders. Please make sure that you keep the throttle plate open during testing.

[D_Stirls]

Having even results are the main thing. Different compression testers can have different calibrations and things like cams and cam timing can have a large effect on the results. Just buy changing my cam timing my compression went from 165 to 145 (same tester).
A leakdown test will tell you the condition of your bores and where your losing the compression, if you are.

[Rambo24o]

No engine was cool
No I did not keep the throttle open
Yes I took all the spark plugs out

[float_6969]

Repeat the test with the throttle open and the numbers should come up considerably.