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Hello

I have had my bottom end rebuilt in my GTR and installed Arias pistons that stick out of the block by 8thou. What thickness head gasket would I need to buy to keep the standard GTR comp ratio? I am guessing that 8thou is approx .2mm?

What is a standard GTR head gasket thickness?

Cheers.

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  • 3 weeks later...

I have a couple of questions then:

1. I had brought a 1.8mm metal head gasket, can anyone guess at what my resulting compression ratio would be? I am guessing that it would be the same as using a 1.6mm gasket on a standard motor?

2. What would be the compression ration if I ran a standard head gasket (1.2mm) with the pistons protruding 8thou?

Just trying to work out the best combination for running R34 N1 turbos on the motor.

Thanks.

you can work out the headgasket volume but you need the diametre of the hole....for the pistons drop them say 10mm down the bore(measure with a dial indicator)then CC it....work out what the volume of 10mm with your bore size then deduct it from the reading and that will give you a minus figure....then do the head then work it all out from there

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