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ixlr8ez

Apr 28, 2006 08:07 PM

Low compression

I get low copression (around 70 psi) in cylinders 1 2 and 4. Cylinder three has about 160 psi. What would cause this? The motor has just been rebuilt, bored .020 over has new everything. Any ideas?
thanks

Walter

Apr 28, 2006 08:17 PM

Re: Low compression

piston rings ?

1991civicsi

Apr 28, 2006 09:51 PM

Re: Low compression

Did you measure the ring gaps? Were the ring end gaps spaced properly? Were the rings installed properly? Did you build enough oil pressure? Do a leak down test, it may be leaking from the head if its not leaking from the bottom end.

peenmysoup

Apr 28, 2006 11:12 PM

Re: Low compression

Sounds like to me only one of the pistons have the rings on them right. Time to crack it open again

ixlr8ez

Apr 29, 2006 01:21 PM

Re: Low compression

thanks guys, I'll do a leak down test and see what happens. Knowing me though I probably forgot to put the rings on right

ghettoturbo

Apr 29, 2006 02:22 PM

Re: Low compression

how long have you run it

ixlr8ez

Apr 30, 2006 11:15 AM

Re: Low compression

Quote:

Originally Posted by ghettoturbo

how long have you run it

I haven't run it since it was rebuilt

con	Apr 30, 2006 11:44 AM

Re: Low compression

Quote:

Originally Posted by ixlr8ez

I haven't run it since it was rebuilt

You need to break that ---- in before you will have good compression.

ixlr8ez

May 2, 2006 10:08 AM

Re: Low compression

Yeah but it ahould be better than 90 psi

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