I did a compression test today, the day was sweet so i was out working on the car... and the results... which I am still confused by... any input would be great.

I just got my car back from the shop, with CTR standard bore pistons, in a B18C5, and did a compression test to make sure the motor was running good.

Results and the Order from 1-4... 239, 240, 239, 240.

My question is, even tho the motor is good and dandy the fact that they are very consistant and close to each other, doesn't it seem low for CTR pistons? I believe CTR pistons bumps from the factory 10.6 to 12.1-12.3 approx.

From what I was told it was suppose to be close to 300 all around.

Correct me if im wrong or for asking such stupid questions, but any help would be great.

thanks


Modified by QuanKwan at 2:56 AM 3/2/2004

 

Different compression testers show different compression numbers. As long as they are all close you are good to go.

 

if your not happy with the results try dumping a teaspoon of oil into each spark plug well and see if that gives you the numbers you want. if so change you piston rings and youll be good to go. those readings were good though, practically anything above 200psi is really good. if the pressure doesnt jump after adding oil then you may want to look into replaceing your valve guides and possibly your retainers. make sure you do the test properly...all of the spark plugs out and the throttle wide open ( i use lock wire and wrap it around my butterfly and tie off at the intake)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by QuanKwan &raquo;</TD></TR><TR><TD CLASS="quote">I did a compression test today, the day was sweet so i was out working on the car... and the results... which I am still confused by... any input would be great.

I just got my car back from the shop, with CTR standard bore pistons, in a B18C5, and did a compression test to make sure the motor was running good.

Results and the Order from 1-4... 239, 240, 239, 240.

My question is, even tho the motor is good and dandy the fact that they are very consistant and close to each other, doesn't it seem low for CTR pistons? I believe CTR pistons bumps from the factory 10.6 to 12.1-12.3 approx.

From what I was told it was suppose to be close to 300 all around.

Correct me if im wrong or for asking such stupid questions, but any help would be great.

thanks </TD></TR></TABLE>

Did you have to completely rebuild your motor?

 

I Just swapped out pistons

 

those reading sound more accurate for JDM Type R pistons which yield 11.1:1 with a stock head gasket and 11.3:1 with a spoon or mugen 2 ply gasket.

 

sounds a tad low for 11.8 comp but your readings are very consistent, which is the most important.

glad to see you rebuilt your engine with the TODA belt this time, no more timing belt snaps good luck with your dyno tuning homie

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syner-G-Racing &raquo;</TD></TR><TR><TD CLASS="quote">if the pressure doesnt jump after adding oil then you may want to look into replaceing your valve guides and possibly your retainers. </TD></TR></TABLE>

wow... thats a brilliant comment... from the president of Syner-G-Racing yo.

D

 

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

wow... thats a brilliant comment... from the president of Syner-G-Racing yo.

D
</TD></TR></TABLE>

LMFAO!!!!

 

ahhh anyone with CTR pistons in their B18C5 can tell me what the compression #s should be?