Compression...do I Have A Diff Head Gasket?

[RB20JT]

guys,

im in a bit of confusion....i bought my r32 skyline bout 6 months ago. the guy i bought it off said he has the motor rebuilt with forged pistons, rods. The turbo is a GCG high flow, fuel reg twin plate clutch, r33 gear box. front mount...bla bla.

Now i bought it with std ecu as the previous owner took out the powerfc...i said i didnt care..BUT I SHOULD HAVE BOUGHT IT WITH IT!! FARK...

i saw the dyno sheet...he produced with the above setup plus poiwer fc on 15psi 230kw roughly done by CNV performance. i havent got the sheet now but yer. with my understanding the GCG highflow can handle roughly 20 psi -22psi... am i right?

anyways to the point....

i did a compression test on the engine 2 months ago and got a reading or 146 145 146 146 147 146, now to me if the engine is warn out then yes the compressions would be low but different. So when taking into account with the guy saying the motor has been rebuilt...would he have put a different head gasket on it to reduce the compression???

what u guys think? i haven got the guys number...otherwise i would ring the nob...

any help would be great...

thanks,

daniel

[R31Nismoid]

So whats the problem?

The compression numbers you have posted look spot on.

Hardly any variance at all

[RedDrifter]

I am sure the RB20 should be round the 140 psi. If anything you have better compression than stock so don't stress.

I wouldn't worry about it.

[Cubes]

When I bought mine 5years ago with what appeared to be a genuine 60,000km's on the clock it had around 145-146psi in all 6 pots.

[MANWHORE]

Comrpession is fine - look for variance, not absolute figures, because that varies.

That was the worst mistake you made in not taking the powerfc. Did you try and skimp him, by making a low offer so he goes yeh, you can have it but i'm keepign the powerfc?

Now you have to buy a powerfc (1500$) + 500 for a tune - 2k.

You get what you pay for.

[RB20JT]

yer well...he wanted to take it out anyways coz he had another use for it or sumthing....spewing now.....

NOW...i know that the figures are all exact, im asking is it a std head gasket u reckon? or after market thing..u know the ones that u use to reduce compression or watever...

so yeh...wondering??? wat u think?

cheers for the replies boys

[Cubes]

Yes its most likely std thickness as it represents the usual comp test results.

[RB20JT]

too easy..thanks very much guys!!!

  Cubes said:

Yes its most likely std thickness as it represents the usual comp test results.