Question about 455cid compression...

[dave kopra]

When testing compression, how many pounds should I be looking for? A coach
I am currently studying tested at about 130 lbs per cylinder. Good or not
good?

Thanks again to all of you for your help with my questions yesterday, too!
I appreciate it very much. I'm almost a GMC owner!

Dave Kopra
davek

 

[heinz wittenbecher]

Dave,
others will be better qualified to answer, but FWIW I've always been
told that as long as there is no more than 20% variance it's not a
problem. Of course too little overall means it's worn out

I keep my mtce records (sort of) including compression tests at:

http://www.bytedesigns.com/gmc/workin.htm

Perhaps it'll help some.

Heinz

>
> When testing compression, how many pounds should I be looking for? A coach
> I am currently studying tested at about 130 lbs per cylinder. Good or not
> good?
>
> Thanks again to all of you for your help with my questions yesterday, too!
> I appreciate it very much. I'm almost a GMC owner!
>
> Dave Kopra
> davek