Can someone please explain this to me. If you have a JDM ITR motor and you put CTR pistons in it it will give you more compression. This doesnt make since to me cause the JDM ITR already has a higher compression then the CTR motor. I know it does make more compression but I just want to know why.

Steve

 

CTR pistons have a higher dome on top. That compresses the air/fuel into a smaller space creating a bigger bang.

 

Man its really cool to know that. IMO. So if I put the CTR piston in a B20z block would that also give me a higher compression, or would I have a valve clearance issue. If so what would you have to do to put the CTR piston in a B20z block.

Steve

 

you cant put ctr pistons in a b20 block. B20 bore is 84mm, ctr is 81mm

 

OH yeah WTF was I thinking sorry I was tired and just got off work. God im a ****** idiot for not remembering that.

Steve

 

would a stock bore ctr pistons fit ok on a 00 si?
i heard you have to mill 1mm of each side of the rod. if thats true, where can i take it to get it done and how much does it usually cost?
thnx. guys

 

The stroke also adds to the compression ratio.
That's why the JDM ITR is 11.1. Even though it has a lower piston dome than a CTR piston, the 1.8L stroke compensates, along with the P73-A00 piston creates an 11.1 cr.

The B16B is 1.6L with a higher dome of course puts out 10.8cr. It being 1600cc looses the compression ratio battle, because it's not compressing as much air & fuel as the 1800cc ITR engine.

hth.


[Modified by Katman, 1:23 AM 7/3/2002]