Did a compression test, these numbers ok?!
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Did a compression test, these numbers ok?!
I have been having vacuum problems with my new motor and decided to do a compression test. With carburator adjustments i got my vaccum from 5" to 12". At 5" the needles was bouncing quite erratically. Now it sits at 11" or 12" and just vibrates maybe .25". I have also been using some oil, and i'm not sure what is causing it. I found two of my intake bolts to be a little loose and tightened them. I can see a smoke color of some sort from the exhaust, but i think it may be from my lead additive. Anywho, i did a compression test and the results are as follows:
Cylinder lbs
#1 165
#2 165
#3 165
#4 170
#5 165
#6 167
#7 169
#8 Could not test (couldn't get to plug)
So do these number sound good? My compression is supposed to be
around 9.5-9.8:1. Everything check out?
Thanks for the input! :cheers: :cool:
Cylinder lbs
#1 165
#2 165
#3 165
#4 170
#5 165
#6 167
#7 169
#8 Could not test (couldn't get to plug)
So do these number sound good? My compression is supposed to be
around 9.5-9.8:1. Everything check out?
Thanks for the input! :cheers: :cool:
Melting Slicks
Joined: May 2000
Posts: 2,125
Likes: 9
From: Crescent City, CA
Re: Did a compression test, these numbers ok?! (VETDRMS)
The numbers look good. Don't use the how high of a number logic. Numbers vary with what cam you use.
The basic test is are they within 10% of each other. Yours look good.
Terry
The basic test is are they within 10% of each other. Yours look good.
Terry
Melting Slicks
Joined: Nov 2001
Posts: 2,214
Likes: 0
From: Casa Grande AZ
Re: Did a compression test, these numbers ok?! (VETDRMS)
I agree. Those numbers look really good. The variance between high and low is the most important part. If you have those numbers and good oil pressure, your golden.
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Re: Did a compression test, these numbers ok?! (lbell101)
I'm having the same vacuum issues however. Also for some reason it likes A LOT of timing to run smooth and have vacuum :confused: Oil pressure is 70lbs at cruise and 35lbs at idle (600rpm).
I did not degree my cam when i installed it, also i checked the cam for the matching numbers with my card and couldn't find them anywhere? :confused:
Something tells me this saga isn't over.... :chevy
Thanks for the input :cheers:
I did not degree my cam when i installed it, also i checked the cam for the matching numbers with my card and couldn't find them anywhere? :confused:
Something tells me this saga isn't over.... :chevy
Thanks for the input :cheers:
