DropTopBird

iTrader: (17)

I am in the middle of doing a plug swap so I thought I would check the compression while they are out. History of the car: 2000 auto with 125k on the clock and stock internals. Uses no oil between changes save for the slight oil leak I am chasing down. Mileage has been dropping as of late to the point where its ~17. All numbers are dry with all plugs out and car cold. I think #8 might be lower than the others because I couldn't the the connector 100% tight in the hole. I heard a slight hiss when testing that one which is why I think the number was affected.

1- 135psi
2- 130psi
3- 150psi
4- 140psi
5- 135psi
6- 145psi
7- 135psi
8- 125psi

All I could find about cylinder PSI is that the minimum pressure is 100psi. Ive seen other people post numbers in the 180-220psi range, but most of them were not on stock components (eg no heads and cam). Should I be worried about these numbers? Thanks for the help.

Btw here is a pic of the plugs laid out in the order of the cylinders. I think they look alright for 40k, but thought I would post them up to see what others thought.

BOXCHEV

iTrader: (3)

No thread jack

But was just wondering about this. Will help me out when I go purchase a new motor.

3rdCoastPowerSports

iTrader: (5)

did you do the test with a hot motor? Did you do the test at WOT? after you run the dry compression test, run a wet compression test and compare your two sets of numbers. That will tell you a lot about the condition of the rings. you said you don't have an aftermarket cam is that correct?

DropTopBird

iTrader: (17)

Motor was cold, throttle was open, all stock internal parts. I am going to run a wet test, but thought I would post up these numbers first.

DropTopBird

iTrader: (17)

Bump for any more thoughts on these numbers. I will have wet numbers as soon as I get the valley cover swap done.

HRHohio

Any update?

Interested too.