hey, putting usdm itr pistons in a B18C1, what will this compression ratio be without milling the head, and stock head gasket, thanks for any posts

 

Go here:

http://www.c-speedracing.com/howto/c.../compcalc.html

 

10.6:1 approximately

 

Why would his compression end up lower than a USDM ITR (10.8:1) when he's using the USDM ITR pistons, and a head with a smaller combustion chamber (GSR, 41.6cc, vs ITR, 42.7cc.)?

Its actually going to be about 11.1:1.

 

I didn't check for sure but isn't USDM ITR only 10.6:1.... Therefore being around 10.8:1 with the B18C combustion chamber.

 

Jaker i just checked, it is around 10.8:1.... Where are you getting the extra 0.3:1? Are you sure you aren't thinking about CTR's stock compression being 10.8:1

 

Ok, first off a USDM ITR is 10.6:1. And I approximated (guessed that is). So, bite me.

Second, how do you get 11.1:1? Hell, I'm using JDM ITR pistons, and I'm barely at 11.6:1

 

B18C-EJ1 I agree, Jaker goes and tells you that you are wrong when he doesn't even have a clue what the STOCK ITR compression is... Anyways from you saying 10.6:1 and him saying 11.1:1, you were closer. Latez

 

You are both correct, and I made an error. it is indeed 10.8:1.

 

Correct me if i am wrong, but i think the 11.2:1 ratio came from itr pistons with a 2 layer headgasket, and 10.8:1 with stock 3 layer. Keep in mind this is in a stock bore 81mm block. Thanks for all the posts

 

yeah i think its 13:6.1 ahahahhah


[Modified by GS-Rcivic, 4:34 AM 11/5/2002]

 

Yea normally i go by this... A stock headgasket is around .029" each less layer is around 0.10" so a two layer head gasket would be about .019" thick. Each 1 layer or .010" off is equivlent to around .27-.28.... Therefore 10.8:1+.28 it would be right around 11.1:1 or so...