Compression test
95° ouside engine cold
1 - 140
3 - 140
5 - 145
2 - 140
4 - between 135 and 140(137.5? Lol)
6 - same as 4
Is this good?
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Compression test
95° ouside engine cold
1 - 140
3 - 140
5 - 145
2 - 140
4 - between 135 and 140(137.5? Lol)
6 - same as 4
Is this good?
Yeah it's not bad. Engine being cold it's hard to get an accurate reading but what you really want to look at is certain ones being off from the others. Yours are pretty close so I would say your compression is fine.
I guess once I get my.front turbo rebuilt and it all put back together.I'll do it again but warm..
I get around ~130 on cold engine, but i'm not sure if the car not being run for a week beforehand makes a big difference (piston rings probably dry). also have cams so that might make a tiny difference
Quote:
Originally Posted by i3igpete
Forged pistons might make a difference when cold. They expand more than cast do.
I still get an average 140 with 219k on my engine.
I haven't run her in weeks.. and its stock internals. Looks like my oil was only front turbo bad heh...
My engine is about 150-160 with Wiseco pistons.
mine is 125-130 on all forged internals. came like that form laniers speed shop. he bored it a bit larger than .060 to handle taking a beating. he builds 7 sec drag cars btw ;)
mine was 150ish. but its more about the % difference between cylinders. your engine is fine
Consistency is the key with a compression test... not actual numbers. Yours are consistent, and unlike many cars, we actually have a spec in the manual. Many cars don't have a compression spec, they just need to be within 10% of each other.
Here's the other thing, you need to do the test with consistent cranks as well. For instance, you can't do one cylinder for 3 cranks and then do another with 10 cranks. Sure, it may take a lot of cranks to reach max compression, but they key is consistency. You need a strong battery for every crank, the same number of cranks, the same temperature, etc etc.
I did 5 cranks on each cylinder, same temp, and.battery was fully.charged before I started. I'm just happy I don't need a lower.end.rebuild lol