What should cylinder compression be?
Thread Starter
TECH Enthusiast
Joined: Oct 2003
Posts: 579
Likes: 0
What should cylinder compression be? What should the cylinder compression be on a stock LS1?
I just rebuilt mine, haven't dyno'd or tuned it yet. It has a .581 lift comp cam with LS6 Style Patriot heads. I only checked one cylinder and it was 135 pounds, I think that sounds low? There is about 500 miles on the motor
Thanks
I just rebuilt mine, haven't dyno'd or tuned it yet. It has a .581 lift comp cam with LS6 Style Patriot heads. I only checked one cylinder and it was 135 pounds, I think that sounds low? There is about 500 miles on the motor
Thanks
That sounds real low. Mine was at least 155psi and I've got a ton of miles on this engine. You really need to check all the cylinders and double check that one because you may have an issue if that one is lower than the rest.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Compression test should always be done with leakdown test.
Reason is that you may show low compression but it could be valve/seat related.
A leakdown will let you know where your compression is leaking from and by how much.
Reason is that you may show low compression but it could be valve/seat related.
A leakdown will let you know where your compression is leaking from and by how much.
Originally Posted by 2w0s060
Thanks guys, appreciate it.
I think we are having some valve seat issues because it is burning oil. I will check a few more cylinders as well
I think we are having some valve seat issues because it is burning oil. I will check a few more cylinders as well
Thread Starter
TECH Enthusiast
Joined: Oct 2003
Posts: 579
Likes: 0
Originally Posted by GuitsBoy
Valve seat or seal? Seats will affect compression, but the seals affect oil consumption.
What do you think?
Thanks
