mikkel

Can anyone tell me the cc.on a standard 2wd combustion chamber and the thickness off the Head gasket.
Thanks

MadMac

ERM, needle in a haystack! What car? What engine? Turbo or N.A???? petrol or diesel

Combustion chamber size isn't measured in cc's its measured by the ratio to which the pisont compresses the air fuel mix in the cylinder. Say 10:1 is typcal for a petrol N/A car, 15:1 for a Diesel, 8:1 for a turbo.

mikkel

OH, I forgot to say this was about a Sierra Cosworth.
But about MadMac's post,how can you calculate the compression ratio if you don't
know the volume of the chamber+gasket,hrmm

Stu @ M Developments

iTrader: (12)

He wants to know the actually clearance volume in CC.

The easiest and most accurate way to measure this, and many will disagree, but it works fo me, is to bolt the head onto the block with engine set to compression TDC and using a BURRETTE measure the amount of fluid required to fill up to the spark plug hole.

That will give you asn accurate clearance volume, then you just need to add your swept volume into the equasion and bobs your mothers brother

MadMac

You can work out the clearance volume by using the cc of the engine and the compression ratio cant you?

Yeah, didn't think about using a burrette to mesure it, that will be usefull to know cus I always did it by dividing the swept volume by the compression ratio.

Stu @ M Developments

iTrader: (12)

Yes, but what happens when you dont know the compression ratio? say youve skimmed the head and the block, and are using pistons that you have machined valve pockets into?

MadMac

All good stu all good, you learn something new every day!