is there a way to test compression in a cylinder with the engine out of the car? i have a compression tester, will i get an accurate reading by cranking the engine over by hand a few times or will i lose pressure to fast?

 

i dont think so....never heard of doing a compression test with the motor out...i just did mine...ran 190 across with a b20b4 bottem end...low comp setup

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mouab18c1 &raquo;</TD></TR><TR><TD CLASS="quote">never heard of doing a compression test with the motor out...</TD></TR></TABLE>

me neither

 

Try it, turn the crank over with an impact gun to build pressure.

 

wont work, to get accurate readings motor needs to be at WOT

 

You wil not be able to do the compression check however you could do a leak down test. Which in all reality would accomplish the same thing. Kind of a static compression test.....

 

the motor needs to be at operating tempature

 

It would give somewhat of an idea. burnt valves, cracked ring lands, its better than doing nothing. Although at operating temp. would be ideal, it would still work OK..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all-mtr-teg &raquo;</TD></TR><TR><TD CLASS="quote">Try it, turn the crank over with an impact gun to build pressure.</TD></TR></TABLE>

i wouldnt do that, you may snap the crank bolt.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 808DB1 &raquo;</TD></TR><TR><TD CLASS="quote">the motor needs to be at operating tempature </TD></TR></TABLE>

Technically yes, but you can still observe cylinder variability when it is cold. OP, have you considered connecting the starter and "jumping" it?

 

no i didnt think about that. u mean bolt up my starter, connect it to power and use a bump starter to crank the engine? ill try it. thanks