Ok, I used the compression ration calculator on C-Speed Racing's website and I came out with this...I was wondering if this was too high for a street car.

block:
B18C1

head:
B18C1 P72

piston:
JDM ITR (these are the pistons I wanna use in my build up)

headgasket:
OEM 3-Layer B-series

piston-to-deck height:
OEM B18C1

c/r calculated to = 12.0:1

Is this too much compression for a street car? We have 93 octane fuel here in MA. Just wondering if this was too much or should I try using some other pistons? I am tryin to hit at least 210-220 whp in my GSR.

this is the link:
http://www.c-speedracing.com/h...c.php

 

It's high, but not necessarily too high for a street applicaiton, imo. Check around and you'll see guys with 13, 13.5 on H-T.

 

That seems to be wrong to me I had a gsr with jdm itr pistons and the compression was 11:3:1 and ran on pump 93 octane fine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ramhorn15 &raquo;</TD></TR><TR><TD CLASS="quote">That seems to be wrong to me I had a gsr with jdm itr pistons and the compression was 11:3:1 and ran on pump 93 octane fine</TD></TR></TABLE>

youre right. he is wrong.

think about it.

jdm b18c"r" (pr3 head) 11.0:1CR if im not mistaken?

gsr with gsr head with ITR pistons = same damn thing, plus .2CR because of gsr head. so...yea


i think the zeal autoworks compression calculator is way way high.

 

has the head been milled?

try http://www.zealautowerks.com/

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xDEFTONESx &raquo;</TD></TR><TR><TD CLASS="quote">
i think the zeal autoworks compression calculator is way way high. </TD></TR></TABLE>

do you mean c-speedracing or zealautowerks?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dinko &raquo;</TD></TR><TR><TD CLASS="quote">do you mean c-speedracing or zealautowerks? </TD></TR></TABLE>

zeal. c-speed averages about a half point lower on same set up.

ill get bored and sit there and enter in a KNOWN CR on a particular set up and itll read give or take about 1.3ish points high.

i mean thats ballpark, and on the safe side, but you know...honda-tech is full of envelope pushing stunners we need to know EXACTLY how shitty itll run on pump gas not "about" how shitty.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dinko &raquo;</TD></TR><TR><TD CLASS="quote">has the head been milled?

try http://www.zealautowerks.com/</TD></TR></TABLE>

naw the head hasn't been milled...i figured it was wrong cuz from what I know CTR pistons put u up in 12:1 c/r...so i figured JDM ITR pistons would not put u that high...but after goin over it in the calculatot I was having doubts.....so does anyone have an accurate calculator?

BTW, it was C-Speed Racing.

 

dude, its not rocket science. with the same crank and deck height as an itr, with jdm itr pistons, all you have to do is take the jdm itr stock CR, and add .2 points for the gsr heads quench area.