what compression levels does a motor need a rebuild?

Reply Subscribe

Thread Tools

Search this Thread

Apr 9, 2010 | 03:00 PM

rcantu

Thread Starter

2nd Gear

iTrader: (11)

Joined: Apr 2009

Posts: 105

Likes: 0

please close

thanks

Last edited by rcantu; Apr 10, 2010 at 01:47 AM.

Apr 9, 2010 | 03:05 PM

03BRG

4th Gear

Joined: Nov 2006

Posts: 570

Likes: 0

If you have any questions find a shop that can do a leak down test. That way you can pin point bad valves bad rings the compression test only tells you part of the story.

Apr 9, 2010 | 03:24 PM

rcantu

Thread Starter

2nd Gear

iTrader: (11)

Joined: Apr 2009

Posts: 105

Likes: 0

thanks. i also read it could be the cam as well. it still idles fine w zero misfires and no check engine light.

Apr 9, 2010 | 06:02 PM

plasticknives

3rd Gear

iTrader: (1)

Joined: Jan 2010

Posts: 285

Likes: 2

From: MA

For comparison, I just did a compression test on a stock block and head and came up with 175 170 180 181.

Even if 130 was normal, I would be concerned with the 30 psi variation between cylinders.

Apr 9, 2010 | 09:11 PM

cmt52663

6th Gear

Joined: Jun 2006

Posts: 4,165

Likes: 400

yep -- all those numbers are too low, and they should be at least within 5 lbs across all cylinders.

a good leak down would be the way forward. head? rings? both?

sorry.