How much do you guys think stage 2 needs as in compression. I have a gsr and was thinking of going ctr pistin. Do you guys think that'll bump enough with a mill head?

 

ya thats enought compression, try searching usually. 11.5 and up compression is good. those ctrs in a gsr will be around 12.0 +

 

12:1 cr would be perfect for those cams. I wouldn't mill the head either.

 

Don't run ctr or mill the head the compression will be way to high.

 

The sweet spot compression wise for those cams is around 11.8:1 if u use a dynamic compression ratio calculator (correct me if im wrong), so 12:1 isn't really too much.

 

im running 12:1 with my stage 2s and they love it....

 

ctr in a gsr is more like 13:1.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Runnerdown &raquo;</TD></TR><TR><TD CLASS="quote">ctr in a gsr is more like 13:1.</TD></TR></TABLE>

you sure.... i always that on a gs-r head it would be at 12.1 or so.

 

https://honda-tech.com/zerothread?id=717928

P72 head/B18C Block

STD = 12.924594026551906
.25 OS = 12.989047869209281

 

If you use a compression ratio calculator such as the one on http://www.c-speedracing.com, the cr is around 12:1.

 

C-speeds compression calculator is incorrect in regards to PCT pistons! See the above link ^^^^

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Runnerdown &raquo;</TD></TR><TR><TD CLASS="quote">Don't run ctr or mill the head the compression will be way to high.</TD></TR></TABLE>

Nothing is too high...

 

CTR sounds good to me. thx for the replies.

 

bump...does anyone know exactly how much CTR bump compresstion for gsr?

 

Yes, did you see this post at all?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Runnerdown &raquo;</TD></TR><TR><TD CLASS="quote">https://honda-tech.com/zerothread?id=717928

P72 head/B18C Block

STD = 12.924594026551906
.25 OS = 12.989047869209281
</TD></TR></TABLE>

 

I'm running 12.5:1 and my s2stg2's love it

 

Welp a year later with the CTR piston in my motor it BLEW....It loved the 13.1 compression for about a year and it gave me the MIDDLE FINGER....haha...I was now thinking about using PR3 pistons where my compression should be at 11.28, or should i get p30 to bump it up to 11.5. I'm also planning to hit the nitrous button eventually. So i'm leaning toward the PR3 for lower compresson safer for Nitrous..Whats your thoughts on that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aznstyler119 &raquo;</TD></TR><TR><TD CLASS="quote">Welp a year later with the CTR piston in my motor it BLEW....It loved the 13.1 compression for about a year and it gave me the MIDDLE FINGER....haha...I was now thinking about using PR3 pistons where my compression should be at 11.28, or should i get p30 to bump it up to 11.5. I'm also planning to hit the nitrous button eventually. So i'm leaning toward the PR3 for lower compresson safer for Nitrous..Whats your thoughts on that?</TD></TR></TABLE> Hey, I would go 13-1 this poster made it a year. Wo-Ho. I have block's and heads for sale. 13.4-1 sounds like a good number. IM me for parts. After the button.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote"> IM me for parts. After the button.</TD></TR></TABLE>