okay, i know this topic has been covered 50 million times, but everytime i get 50 million different results, i cant seem to get a straight answer on the cr of ctr pistons in an ls block with a b16 head, I've read that the ctr is 6.35cc all the way to 8.63cc and piston to deck height from being anywhere from stock ls height of .030 to .020 for b16b height and .010 b/c some say you should deck the block and mill the head to get a "true seal." And all these variables can push CR from 11.7 to 12.8, could someone shed some light on this subject? TIA
P.S. oh yeah, i already searched

 

bump4ge

 

cheak out the c-speedracing compresion calculator, its really easy

 

are you guys ******* morons.

lookie here i search fopr PCT or CTR


and lookie what i find

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

WOW a thread i posted not too long ago. not even in archives yet.

and look whats in there

Edit:
PR3 head/B16 Block

STD = 11.643438609136867
.25 OS = 11.703231023151065

PR3 head/B17 Block

STD = 12.193487116069006
.25 OS = 12.256369577319077

PR3 head/B18C Block

STD = 12.58636786521145
.25 OS = 12.649248792586258

P72 head/B18C Block

STD = 12.924594026551906
.25 OS = 12.989047869209281

PR3 head/B18A/B Block

STD = 12.825536009218106
.25 OS = 12.88971493738735

P72 head/B18A/B Block

STD = 13.170743903246784
.25 OS = 13.236528215133324

(THANKS ALTERED!)

now get a clue and use the search function before u post a question u know has been asked...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97L-esVeeTeg &raquo;</TD></TR><TR><TD CLASS="quote">i know this topic has been covered 50 million times</TD></TR></TABLE>

 

I dont think there is a need for name calling here, I thought we are all here to give each other a helping hand.. not demean a guy and then help him.
Thanks for clarifying things though, I'm sure its appreciated.

 

u know as well as i do that he shoulda searched./..

 

I'm taking a motor apart tommorrow for a guy in town. Supposely, he has CTR pistons install, motor last for like 500miles and went BOOM.

Should be fun working out in the sun tommorrow.

 

Its possible, but i wouldnt recomend it. Those calculations done by "Altered" are correct. C-speed is wrong.

-sander

 

Holy **** guys, this has been covered so many times.

The c speed calculator is WRONG for PCT's in an LS block. The piston to deck height should be ZERO.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by johnzm &raquo;</TD></TR><TR><TD CLASS="quote">u know as well as i do that he shoulda searched./..</TD></TR></TABLE>

I can't argue with that ..I was just in a crappy mood earlier heh.


Modified by Tomek at 11:48 PM 7/12/2004

 

Well johnzm, this is my point, this HAS BEEN COVERED 50 MIL. TIMES but like previously when i searched on not only H-T, but google, lycos, yahoo, i noticed the IB website has the piston cc's different than the c-speed website, and so far in this thread we've seen CR #'s from 11.7 to 12.8 like i said before, so lets not turn this into bash the n00b, i got varying answers from different sources and felt the good people of H-T could supply a clear and concise answer... i guess not. So before you assume i didnt or cant search... i did, thats why i'm here, b/c the diff between 11.7 and 12.8 is HUGE which is something i dont have to tell you guys. But thanx for the help anyway although i still havent got a clear answer so is it 11.7 or 12.8? TIA

 

roughly 12:1 yes its streetable on 93 octane and chipped ecu.