warmed the car up and shut if off...waited 10 min then took plugs out. gassed it and cranked it 4 or 5 times. setup is a b16 head on gsr block with jdm itr pistons. got 240, 210, 240, 235. i dunno what's up with #3. what could be the problem? worn piston ring?

 

sorry for being such a n00b

but from this, how do u find ur compression ratio? eg 11.1:1 etc... :S

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ek_jeremy &raquo;</TD></TR><TR><TD CLASS="quote">warmed the car up and shut if off...waited 10 min then took plugs out. gassed it and cranked it 4 or 5 times. setup is a b16 head on gsr block with jdm itr pistons. got 240, 210, 240, 235. i dunno what's up with #3. what could be the problem? worn piston ring?</TD></TR></TABLE>

Could be. That's not super bad anyway, but a bit more variance than you'd like to see. Dump a teaspoon of oil in #3 and try that one again. If it goes up near the others it's likely the rings. Otherwise it's probably the valve seals.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Weapon &raquo;</TD></TR><TR><TD CLASS="quote">sorry for being such a n00b

but from this, how do u find ur compression ratio? eg 11.1:1 etc... :S</TD></TR></TABLE>

You don't.

 

Those gauges are too innacurate and there are too many factors to reliably calculate static c/r from it. Even altitude would play a role.

 

then how do u find ur compression ratio? :S

 

You calculate it, by hand or with a program.

http://www.c-speedracing.com/h...c.php

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TimoneX &raquo;</TD></TR><TR><TD CLASS="quote">You calculate it, by hand or with a program.

http://www.c-speedracing.com/h...c.php</TD></TR></TABLE>


isn't there like another site that used pictures of the head, block ,etc................just wondering, I like to plug and play, rather than sit here with nubmers, lol

 

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


isn't there like another site that used pictures of the head, block ,etc................just wondering, I like to plug and play, rather than sit here with nubmers, lol</TD></TR></TABLE>

LOL

Sure...for all you romper room fans there's this one too.

http://www.bojangs.com/calculator/

 

hm....i'm guessing piston rings, but I could definately be wrong also.

 

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

LOL

Sure...for all you romper room fans there's this one too.

http://www.bojangs.com/calculator/</TD></TR></TABLE>

yea, yea, yea.........thats the one I was talking about. I like picture and stuff .............brings back memory as a kid

 

Maybe not worn rings so much but a broken or cracked ring will lose around 30 - 50 psi in a cyl.