Here is a great link for a how to compression test your engine.

http://www.hazone.com/hb18ccomptest.htm

Cheers!


Modified by Chemicalviper at 1:40 AM 9/24/2003

 

good stuff I am actually doing a comp test tomorrow. crossing my fingers for good results, then its boost time!

Adam

 

i didnt read it all, but i believe they forgot to mention to warm up the engine. Also I highly doubt 270psi is normal for a b18c1 (in the pics you can tell it's a gsr), it's more like 200-220psi.

 

NICE...

now we just have to get people to type 'compression test' in the SEARCH box!!
ya right......lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tilt &raquo;</TD></TR><TR><TD CLASS="quote">i didnt read it all, but i believe they forgot to mention to warm up the engine. Also I highly doubt 270psi is normal for a b18c1 (in the pics you can tell it's a gsr), it's more like 200-220psi.</TD></TR></TABLE>

In my haynes book (yes I know, they suck, I just use it for torque specs etc) it says 270 is the stock PSI. I doubt even a brand new gsr motor has that though. My motor is 250 246 245 245 so it isn't too far off.

 

this is what i have been looking for..

 

good clean and simple!
sweet find.

 

I would disconnect the distributor also.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tilt &raquo;</TD></TR><TR><TD CLASS="quote">i didnt read it all, but i believe they forgot to mention to warm up the engine. Also I highly doubt 270psi is normal for a b18c1 (in the pics you can tell it's a gsr), it's more like 200-220psi.</TD></TR></TABLE> yes, 200-230 seems to be normal...everyone seems to think that if you don't have 250+ across all four cylinders youre screwed.

 

this is something I've been meaning to get around doing one day.

 

would a built motor running differnt comp. pistons and head gasket effect this?
how would you know what to look for?

me = 8.5:1 pistons, .44mm headgasket...

 

Also, when it says to crank the engine, does that mean get in your car and turn the key to crank the engine? Or are you suppossed to somehow do it manually? Sorry if it's a stupid question, but I'd like to do this myself.

 

Just hold ignition fully turned to start - just like a cold hard start keep the key turned all the way until the need on the compression tester has stopped.


NOTE: What they forget to mention - Its best to have your car operating at normal temperatures for a little bit ( like let it idle out for 10 mins ) or go drive around. Come back. Turn off car. Begin procedure.


Gsr at 270 compression is mega high in my opinion - 200-240 is pretty good for GSR
I believe LS/RS is 190+ good.

Hopefully this helps - I made the title of the article simple so it can be easily searched hopefully.

 

so what happens if you do not take all the plugs out when doing the test. just taking out the plug from the cyl you are testing. how far will that throw your results

 

it will be harder for the motor to crank, that's all. if you manually crank it then it'll be hard, if you do the turn-key crank method then it won't matter.

 

funny, i just did on today om ny mr-2. 230-230-245-230. oil fell in the one with 245. very high for a mr2, but has high mileage and carbon build up. my gsr came to 220 across the board too.

 

oil in cyl = higher compression.

 

so what about a ls with b16 pistons...

 

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

 

got 190 psi on all four on my gsr.

 

Its decent. Could be better. my friend has a gsr in his 97 hatch his did 225 across the board.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chemicalviper &raquo;</TD></TR><TR><TD CLASS="quote">Its decent. Could be better. my friend has a gsr in his 97 hatch his did 225 across the board.</TD></TR></TABLE>

was it a stock motor?

mine seemed a little low compared to all the posts ive read on h-t.

but i guess its ok for a 100k+ stock gsr motor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MachAF &raquo;</TD></TR><TR><TD CLASS="quote">http://www.c-speedracing.com/howto.php</TD></TR></TABLE>

I was goin to say the same thing .

This topic has been covered SO many times people still shouldn't be asking about it.

 

so you are suppoed to do this when the motor is at operating temps, but i thought you were supposed to wait for the motor to cool before you took out the plugs? please correct me if i am wrong.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cover94 &raquo;</TD></TR><TR><TD CLASS="quote">so you are suppoed to do this when the motor is at operating temps, but i thought you were supposed to wait for the motor to cool before you took out the plugs? please correct me if i am wrong.</TD></TR></TABLE>

Warm motor. But if you perform it on a cold motor you won't get the proper readings.