Yes, I know this topic has been discussed countless times already; but I noticed on my '03 (with 52K) an increase in oil consumption lately: About a quart / 1500 Mi. But given the fact that I redline my engine quite often, and that I drive like a maniac, I'm not that all surprized.
So, for peace of mind and eventhough my engine still seems to be running strong, I had the cylinder compression checked, and here are the results:
#1 & #3: 190 PSI
#2 & #4: 180 PSI
It seems quite low to me, so what gives? I hope the test was performed with the engine below operating temp.
The mechanic says, the numbers are good, and for sure, they are well within the tolerance within each other, and they are above the service manual's 134 PSI; But compared with the other numbers I've seen on this board, I'm pretty worried.
Any advice, suggestions?
Thanx

 

I'd say drive it till it quits working and then worry about it. Even if they're low (which I'm not saying they are), there's nothing you can do about it so, worry is pointless. Compression check isn't a reliable way to measure engine wear anyway.

For oil consumption, I'd be looking at the PCV valve. You're probably sucking oil through the valve.

 

boost it then the numbers will go up

 

I think max is around 200-220

190-180 seems fine to me, i'm going to do one on mine soon for kicks. I'll let you know

 

Thanks.
And I'll be looking at that PCV valve.

 

Those are the numbers I had too. Everyone told me that I was fine and the car still drives great. You should be okay too as long as everything is performing correctly.

 

The f20 motor is a pretty high compression motor isnt it? Normally numbers for a high compression motor are over 220 imo. My Usdm Itr i believe did in the 230's with 10-6 compression

 

The last time I did a compression check on my car it was about 210 for all cylinders. But I can't remember what that complete specs were for the car.

 

I found a spec of 228 psi in a mitchel publication. But your compression #'s are all close to eachother. My guess is that the test wasn't performed correctly and that is why you got low #'s. Or your test equiptment wasn't all that great.

The important thing is that the cylinder compression #'s are very close to eachother. If you had for example #3 cylinder with 150psi, and all others with 220psi, then there would be cause for concern.

No need to worry.

 

That's right . Plus the mechanic told me that the spark plugs where clean with no fouling whatsoever.
Maybe I'm just too anal about it!