The Central Hub for DSM Community and Information

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. This is where the DSM platform history is documented and archived. Log in to help us in our mission, and to remove most ads from the browsing experience.

What do these compression #'s mean?

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Megags

15+ Year Contributor
155
0
Oct 21, 2003
My car has been burning oil for a while, I'm tired of it so I decided to test the rings to see if I could get away with a freshening of the head. I only see it smoke when it has been idling for a few minutes (3-5).

I need some advice on if the rings are okay. Here's the #'s

cyl1 195 wet>235 (used capful of oil)
cyl2 200 wet>230
cyl3 200 wet>230
cyl4 200 wet>235

All vacuum readings indicate a healthy motor. Please tell me what you think I should do. I'm tired of putting in oil. Nt compression is supposed to be 192psi and the service limit is 145psi. I didn't know if I even needed a wet test, but did it anyhow.
 
Thanks, just wasnt sure since it had higher comp than its supposed to have. lots of miles 176k.
 
Quasimondo said:
Most likely the problems are the valve seals.

Or, it could be the rings. Perform a leakdown test as recommended to get a grasp on where the oil consumption is coming from.

Let us know what you find,

Andy
 
Add Value - Be Respectful - No Trolling - No Misinformation - Participate Often!
Support Vendors who Support the DSM Community

Latest Classifieds

  • Wanted 2g Shot in the dark (2g Pass strut cut out)
    Need 2g strut tower to save time.
    • frosh29
    • Updated:
    • Expires
  • For sale 2g 2G Mishimoto Radiator & Fan Shroud
    2G Mishimoto Radiator & Fan Shroud $200 + shipping and paypal feesYou must be registered to...
    • jersygsx
    • Updated:
    • Expires
  • For sale VIRGIN 4G63 6-BOLT TURBO HEAD
    Came off a virgin stock AWD Auto 1G DMS (91), also have matching block and crank which are also...
    • The_Partout_Spot
    • Updated:
    • Expires
  • For sale 1G DSM 4G63 6-BOLT TIMING COVER
    Used, see condition in photos. Buyer covers shipping / fees.
    • The_Partout_Spot
    • Updated:
    • Expires
  • For sale Garage clean out
    Changing setups on the car and getting rid of some stuff as well that's been laying around. Will...
    • 92GSXtacy
    • Updated:
    • Expires
Back
Top