What Is A Good Compression Reading?

[CeJay]

Did a bit of a search just wanted to confirm what a good reading is?. Just had mine done, on a dry test they are coming up as 125psi each, pretty much the same, engine is an r32 spec rb25de-t (head doesn't have VCT) I thought this was a bit low but the mechanic said it was fine?

Had this checked after my turbo seems to have decided to go.

[W1ngnut]

Just for comparison Chris. John @ Trojan just did mine the other day on a cold block:

1st: 145

2nd: 160

3rd: 160

4th: 160

5th: 155

6th: 150

He said it was fine and would be even less of a gap once some heat got into the block.

[R31Nismoid]

http://www.skylinesaustralia.com/forums/Rb...;hl=compression

http://www.skylinesaustralia.com/forums/Co...;hl=compression

http://www.skylinesaustralia.com/forums/Co...;hl=compression

just some of the many

[CeJay]

Yeah I read that, my main concern was the mechanic told me that those figures were acceptable? Dry test was done. And was wondering if anyone else out there had a 32 spec rb25. Apart from wear and tear, what else would cause a lower compression? I thought the engine would get about 150-160 or so.

The engine was done by performance garage testarossa in japan, and was wondering if they would have lowered the compression ratio in the engine to support a big turbo? Apologise for the noobyness of the question.

[CEF11E]

hey chris,

as long as they are all the same you have no problems. might be low if it was done on an inaccurate guage. but if they are 125psi across the borad you have no probs. also your engine has great throttle response so i am thinking your comp ratio is at least 8.5:1

so your turbo is buggered? no good. mine needs a bit of attention soon and i want to get a bigger rear housing on it. are you going to get a new one or get yours rebuilt?

cheers!

[CeJay]

Hi Nic

thanks for the advice.

turbos fuba, fins bent and broken etc. Thinking of going a GTRS or a GT3076, still making up my mind what I want to do etc. So haven't decided.