what compression numbers on a m50nv

[livetheride]

What should I see for compression numbers if I compression test a m50nv?

It has only 126K on it, so im assuming its not too beat, but want to check numbers before buying.

thanks

[JGood]

I think the important thing is the variation between cylinders. They should all be fairly close (within 10% maybe?)

[livetheride]

okay. but would be a bad thing if they all come out at, like, 90-100? I know which an m20 people typically get around 150ish on a healthy motor IIRC.

[Adrian_Visser]

The reading depends on the altitude you are at but 90-100 seems low. If they are all within 10% though I would suspect a problem with the pressure tester more than the engine.

[JGood]

Yeah I think 140-160 is normal, but it really does depend on the tester.

[MattM]

mine were 196-201, tested by a shop. 92NV with 100,000km(62k miles)