Need help calculating compression ratio

[Ken Park]

I am about to have a KA24DE put together with forged pistons which are 8.6:1 and I have a headgasket that is 3mm thick. I have seen compression ratio calculators on the net but I dont know all the variables to plug in to get the answer. Can someone please help me out and tell me what my final compression ratio will be ---- (with the block deck and head surface being stock figures)

[c-rad]

3mm? That's insane. Why in the world would you get one that thick? You would be ruining the quench area of the combustion chamber. Use a stock thickness headgasket or adjust the thickness depending on how much was removed from the head/block during resurfacing.

[Ken Park]

I had gotten one that thick because I had planned on running it with stock compression on an otherwise stock motor. I came across some 8.6:1 pistons for a hell of a deal also.

[c-rad]

I had gotten one that thick because I had planned on running it with stock compression on an otherwise stock motor. I came across some 8.6:1 pistons for a hell of a deal also.

Even still...buying a thicker headgasket for the task of lowering the compression isn't how it should be done. As I stated before, it throws off the quench area and the motor will run like crap (ie: usually results in incomplete combustion).

[Ken Park]

Thats good advice, thankyou. I am going to go with a 1mm thickness gasket.