my buddies building his LS VTEC, his set up is as follows:

LS B18B block
stock crank and rods
81mm Civic Type R (PCT) pistons

GSR head, untouched
skunk 2 stage 2 cams

my question is what kind of compression is he looking at? ive done compression calculators on 2 different sites, and i got 14.23:1 and 12.81:1... from some of the experienced, which one will be more accurate

also, assuming he tries running the stock headgasket, how close will the valves he to hitting the pistons with his skunk 2 cams? or will they hit?

any help would be greatly appreciated, thanks

 

compression should be around 12.2-12.3:1 dont know about piston valve contact tho. he doesnt plan on runnin those cams on stock springs&retainers doees he?

 

see here for more info.

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

I personally trust this site

http://www.zealautowerks.com/

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">see here for more info.

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

I personally trust this site

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

that website greatly contrasts from the highly used c-speed calculator

lsvtec with pct pistons would not put out a 14.4:1 compresion ratio

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">

I personally trust this site

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

this site is giving me over 14:1 compression

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by c5_el &raquo;</TD></TR><TR><TD CLASS="quote">

this site is giving me over 14:1 compression</TD></TR></TABLE>

it seem to be very incorrect

use the calculator on c-speedracing.com

it is much more accurate

 

LSVTEC with PCT pistons is 12.8:1 I think check the sticky on CTR pistons at the top of the forum.

 

both zeal and c-speed are wrong for CTR pistons, i go with the thread that was mentioned.

 

so 13.4:1 as posted by omniman is more correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMdc2lsVtec &raquo;</TD></TR><TR><TD CLASS="quote">

that website greatly contrasts from the highly used c-speed calculator

lsvtec with pct pistons would not put out a 14.4:1 compresion ratio</TD></TR></TABLE>


How would you know? Have you clayed a motor to determine if it is wrong?

"highly used"? How do you know?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by c5_el &raquo;</TD></TR><TR><TD CLASS="quote">so 13.4:1 as posted by omniman is more correct?</TD></TR></TABLE> i always go to that thread with PCT pistons if you read what they did it seems correct.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">


How would you know? Have you clayed a motor to determine if it is wrong?

"highly used"? How do you know?</TD></TR></TABLE>

because i know people who have built them, and everyone i know uses it and a 14.4:1 seems retardedly high to be able to run on 94 octane gas dont you think?

im not saying it is 100% correct but it seems close enough

ive learned from experience

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMdc2lsVtec &raquo;</TD></TR><TR><TD CLASS="quote">

because i know people who have built them, and everyone i know uses it and a 14.4:1 seems retardedly high to be able to run on 94 octane gas dont you think?

im not saying it is 100% correct but it seems close enough

ive learned from experience</TD></TR></TABLE>

Good enough