I just did a compression test and my result are:

Cyl 1: 150
Cyl 2: 120
Cyl 3: 120
Cyl 4: 150

But the number drop all the way down to 0... is it my piston rings? can anyone tell me what's wrong?

thanks...

 

What kind engine? how many km?
how is your timing set? properly? because an open valve(s) could cause the combustion chamber from holding compression

 

It's a B18B1 w/ 163,xxx miles. I'm not sure if my timing is set properly. I just had the car for a month.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4 KiDD &raquo;</TD></TR><TR><TD CLASS="quote">It's a B18B1 w/ 163,xxx miles. I'm not sure if my timing is set properly. I just had the car for a month. </TD></TR></TABLE>


How does it run normally? does it feel ***** slow or lacking performance???
I recomend you re-set your timing and do a valve adjustment and then do a compression test to eliminate false timing as a problem.

It could be piston rings at worst. Does it burn oil? when you drive it or drive it hard do your buddie say you have blue exhaust smoke comming from rear?

 

It runs normal no lack of performance. I don't think it burn any oil because there isn't any blue smoke coming out of the exhaust.

 

When you did the test was it up to normal operating temp?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike9571 &raquo;</TD></TR><TR><TD CLASS="quote">When you did the test was it up to normal operating temp?</TD></TR></TABLE>

Yea... I was driving it around for about half an hour.

 

did you have the "pedal to the metal" while you were testing? you should always open the throttle fully with the ignition disabled when checking compression. Why were checking compression anyway?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KWayRacing &raquo;</TD></TR><TR><TD CLASS="quote">did you have the "pedal to the metal" while you were testing? you should always open the throttle fully with the ignition disabled when checking compression. Why were checking compression anyway? </TD></TR></TABLE>

Can't really remember if metal was to the pedal.. .... I'm planning to go turbo that's why i was checking my compression.

 

anyone know why my compression dropped?

 

sounds like a leak from the head (valve seals, poor adjustment, etc...)

to check if it in your rings put a little oil i the combustion chamber before you do the test, but usually rings will give you a low reading not lose pressure after you are done cranking the motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC4 KiDD &raquo;</TD></TR><TR><TD CLASS="quote">

Can't really remember if metal was to the pedal.. .... I'm planning to go turbo that's why i was checking my compression.</TD></TR></TABLE>

youre planning on going turbo with a block with 163k on it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xteg95 &raquo;</TD></TR><TR><TD CLASS="quote">

youre planning on going turbo with a block with 163k on it?</TD></TR></TABLE>

if the motor was healthy yeah.... if not then it's time for a rebuilt.