i have done a search for compression numbers with different pistons in a Poor Mans Type R setup. from what i'm finding, i want to make things clear not only for myself, but for others who are wondering what the compression would be like with different pistons. i do not trust the cspeed compression calculator, because the numbers are not correct.

from searching, this is what i have found people to say about different Honda OEM pistons in a Poor Mans Type R setup to be:

P30 pistons = 11.6:1
PR3 = 11.4:1
P73-00 (JDM ITR) = 11.4:1
PCT (CTR pistons) = 12.1:1

take in mind, the setup is a Poor Mans Type R which is a B16 head, a GSR B18C1 block, and no milling done to the head.

now my question is, do these numbers look rite?

 

yo sup ams member! you know who this is! the number is slightly wrong just alittle the p73 jdm one should make 11.1cr, hey you could call me ill talk to you later

 

i have a jdm itr block, and i was told the cr is 11.1 with a b16 head.

 

jdm itr =11.10
usdmitr=10.6
pr3=11.11
p30=11.3

 

what about CTR pistons in a Poor Mans Type R setup?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote">jdm itr =11.10
usdmitr=10.6
pr3=11.11
p30=11.3
</TD></TR></TABLE>

This is correct

CTR pistons are debateable. But from the dimesions that Ominman provided, the CR should be approx 12.4:1

 

what compression does jdm gsr pistons have and what cr does usdm gsr pistons have with b16 head?????

 

b16 head will lower the cr by .2. i think

 

so if a usdm gsr block lowers it .2 then with jdm gsrpistons it would raise compression .4??

 

anyone know?