Thread: SR20VE compression test numbers...

My 2.2L 90mm 12.5:1 turbo motor pegged my compression gauge past 300psi High comp plus boost and e85 was a blast.

I've started doing a compression test on by VVL (forged pistons,12.5:1 CR 87mm, N1 cams) First was 260, second maxed the tool at 300, so I stopped. Doing something wrong?

Look 1 post up.

Good point if reference. But wondering what is normal/expected.


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Check them all when hot, let it crank until the needle does not go up any higher. In my 12.5:1 88mm N1 motor i pegged the 300psi gauge on all 4. Do a leak down test next, this might help see what is going on.

new sr20ve, n1 pistons, vet metal headgasket, n1 cams, warm reading.

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Holy arm hair! Didn't know samsquatch could perform a compression test! Very nice numbers, looks healthy and I see some other goodies in the pic. Nicely done

doing one plug at a time reduces the cranking rpm.

if all the plugs are out you will see better numbers. take out all the plugs and pull the Dist plug(cas), this prevents the injectors firing and spark events as well, then proceed with your tests. the most important value is the closeness of the readings cylinder to cylinder, IIRC 10~15psi is good, less is better.

As other members have mentioned, a warm engine & open throtle is how u do the test and would allow all to compare apples to apples and so be meaningful and helpful to the community.

If you are not at sea level or close to it, mentioning that will help as well, persons at high altitude are not going to get the same comp readings.