Ran a compression check on my car. It currently has 56,000mi and burns oil like a freak. I got 215psi on the dot on all four cylinders. Good or bad? Thanks in advance.

 

yep, 215 is fine.

 

The biggest concern is how close the # are to eachother!

Looks good

 

Well everyone was dead on the spot. I didn't block the throttle body open. Does that really matter?

 

You should redo the test with the throttle wide open. It should def hav an effect on the numbers but they'll still come out good IMO considering the 215's across the block.

 

Will they be better or worse?

 

Dunno honestly. I've never done a compression test without the throttle being open

Like h00tch said though, as long as they aren't horribly low and don't vary much you'd good to go.

Why is it burning oil anyways? oil rings?

 

How varied is bad? Neighbor's friend bought a '99 GS-R that we suspect has been ridden hard. Outsides are 210, middle two are 240.

 

I'd have to check helms, but I *THINK* it states 10% variance? maybe 15? hell maybe 20... I can't remember for sure.. sorry pat

 

Think it is 10% to 15% difference if I am not to drunk!

 

Yeah I guess so because it burns it BAD. I'm talking like 4 quarts or more between oil changes. I always keep an eye on it though and have never ran it low yet.

 

Not sure about the percentages...but according to my 95 helms, the maximum psi variation is 28 psi for the b18c1...with a nominal compression of 270 psi and minimum being 140. I imagine the numbers are similar to that of a b18c5.

 

That seems like alot of oil. Perhaps it isn't rings, and maybe a problem with the PCV system, or maybe there is a leak somewhere?

Or it could be you drive your car REALLY hard.

 

What is it supposed to be stock?

I need to test mine...

 

Helms says:

213 nominal
135 minimum
28 max variation

My B18C5 was 205-210 and my B18C 96 Spec was 205 across. My old B18C1 was 205 across too.

 

 

i got 225-235 all across

 

Damn, that's burning mucho oil.. You using Mobil 1 synthetic? Numbers sound ok..

 

i need to check my 96spec itr then

 

You know I did a compression check over the weekend as well....I pulled 210 in each cyl without the throttle wide open. I have 30k on the car and I am going through a quart every 1000 miles it seems. I don't know what the problem could be but I am running rich as hell.....took the car on its first road trip and went about a 120 miles using up a little over half a tank .....I think there is some thing wrong

[Edit] Oh yeah i just have an intake, axle back and timing advanced 2.......



[Modified by oRgy, 8:25 AM 1/20/2003]

 

Is the motor supposed to be warm when you do a compression check?

 

yes.

 

About how warm? We just checked the compression on my buddy's jdm r motor and all the cylinders were in between 225-232. I took a temp gun and checked where the spark plugs are and it said 115degrees. Just wondering about how warm it needs to be?

 

I believe the helms states "operating temp". I usually do a comp test after driving somewhere to get something (food, beer, etc).