Relating to my other thread on here ( What power to expect ) It has come to me that my head gaskets could be the wrong size and thickness.

 

I orginallly thought standard piston size was 87.5? or is it 87.0?

 

I have a receipt saying that my block was rebored and hatch honed by 0.20 .5mm which made me think it was an 88mm piston overbore.

 

So now my pistons are either 87.5 or 88mm depending on standard piston size?

 

The head gasket supplied to me are of a 88mm bore and of .45 thickness that i was assured was the right spec i needed even with skimmed heads.

 

Ive read a few writeups which makes me think that the bore size of the gasket should be slightly bigger than the piston is that right?

 

Thanks Dan

Edited June 27, 201015 yr by GIBSTER-TT

Standard is 87mm.

Because your heads have been skimmed the gasket thickness you have is stock, the next thickness size up would have been better to get things back to the same.

Cometic gaskets start at 88m bore size, worth checking your invoice or box the pistons came in to see what size you have, 87.5 or 88.

Ideally bore size of gaskets should be a min of 0.5mm bigger than the pistons.

smithy

Thanks Smithy,

 

I havent got the box no more because i sent them straight to the engine builders.

 

As my original pistons were standard and the rebore is only .5mm they must be 87.5mm pistons. With an 88mm bore gasket that should be about right.

 

Its just the low comp side of things now as like you say ill be running a standard gasket thickness. So ill have a higher or standard compression i think?