According to the FFSquad the jdm p73 pistons will give me 10.8:1 CR in a b17a. this was my first plan, but i'd like to cut costs (by not having to have the rods shaved to have pistons put on).

So, i was thinking that the p30 piston might be a good alternative. I wouldn't have to get the rods shaved, and hopefully the compression would be similar---but I can't find the CR numbers for the p30 pistons in a b17a anywhere.

katman, i'm wondering if you might be the guy with all the answers??

TIA

 

Just logic tells me that it should fall between 10.8 and 11.4. I think it comes to about 11.2-11.3...


Jason

 

how can the p30 pistons be bigger than the p73's?? given this info from the FFSquad:

p30 pistons in b16a: 10.4:1
p73 pistons in b16a: 10.6-7:1

doesn't that say pretty blatently that the p73 pistons are bigger???? Or am i way off on my thinking here?

it seems to me that if there is a .2-.3 difference in the compression of a b16a with the p30 pistons and the p73 that there should be approx the same amount of difference when in the b17a motor, but i just need to know the facts.

 

its the stroke that makes the p30's more compression. if you look at the p30's they acually have a bigger dome. The longer stroke make the higher dome piston go higher in the combustion chamber.

 

i'm not sure why you're talking about stroke. i realize that stroke will change things. but i'm not talking about altering the stroke.

i gave the specs between the p30 and p73 pistons in the b16a (both cases have the same stroke, however the p73 pistons have the higher compression in that case). I just need to know the CR for the p30 pistons in a b17a.

 

jdm p73=10.4
p30=10.9
pr3=10.7
pctx=11.3
these of course are stock bore pistons!
the jdm p73 has less piston dome cc than the b16a pistons. http://www.theoldone.com/articles/pistons/


[Modified by da6_b17a, 12:24 AM 10/25/2001]