Low Compression Result in.

[assa 98gsx]

150-150-130-150 I guess the motor is a bit toasted. the 2cylinder reached the serviced limit. I added a cap full of oil and the 2cylinder pressure jumped up to 170psi. What does that mean? Gasket? Rings? And is it okay if I keep driving it or I should replace them asap?

 

[Burnett03]

150-150-130-150 I guess the motor is a bit toasted. the 2cylinder reached the serviced limit. I added a cap full of oil and the 2cylinder pressure jumped up to 170psi. What does that mean? Gasket? Rings? And is it okay if I keep driving it or I should replace them asap?

it'll be fine for a while

 

[assa 98gsx]

i just did some more researches on the topic and found out the car wasn't really warmed up when I performed the test. Would it resulted differently? What makes the compression ratio different when the car is warmed up?

 

[Cool Mr Steve]

It may make a little difference, but it's definitely not a good thing to have a variance like that in a cylinder. Having it jump like that (jumping 5% or more) means that your piston rings are causing lower compression. If I were you, I'd follow all the specifications and make sure you did everything else correctly after you do the compression test with a warm engine (Having a cold engine generally produces a lower reading). Have your throttle plate open all the way and have all of your spark plugs out and crank it until the gauge stops moving. It's around the service limit, but you'll probably be able to drive it for awhile without much issue.

 

[oldman]

Compression test, follow it up with a wet test.

 

[assa 98gsx]

I will re-do the compression test and leak down test tmr to see if anything improved. But i remember I was also doing a boost leak test and had everything unhooked untill the turbo. I know the intake side shouldn't effect the compression insdie the block, but I am just giving myself some hope..

 

[oldman]

I know the intake side shouldn't effect the compression insdie the block

And you're correct, but you still need to put it back to warm it up.

 

[assa 98gsx]

It suprised me so much on how a warm engine can do to the compression.

195-190-175-190 is what I got today when I warmed up the car. These numbers made me feel so much better now! ! Thanks for all the great help tho. Just note to myself that gotta have a warm car next time.