Compression test results! (wow!!)

:eek:hey guys,

today i did a compression test with my B18B2 gsi integra as i am consiering boosting her. the car has 190,000 km on the clock and the results i got really astonished me.

Cylinder 1= 200psi
Cylinder 2= 200psi
Cylinder 3= 200psi
Cylinder 4= 200psi

this is the max that it should be on a B18B engine. the guage i used went up in increments of 10psi so they prob were not exact on 200 but well over 190 each! i didnt think i would see these results on a car with 190,000km

i do service it religiously though and do everything myself :):):)

btw did i do all the steps right?
1)warm up the car to operating temps so that everything has expanded in the block and is worknig at op temp.
2)pull out all sparkies
3)pull out 15amp FI fuse
4) stick compression meter into sparkplug hole and crack engine 5-7 times with gas all the way to the floor

repeat with all cylinders.

not bad just had mine done
250 -255 psi all four
b18cr

same... mines audm b18cR 260 across all 4

guess ill be boosting now

You guys testing hot or cold?

as in do you mean running temp or cold engine? i did mine after warming up the engine.

my b18c7 dc2r went 235psi in all 4 cylinders....
ready to be boosted............

what are danger numbers on the DC2R???
200 n over is safe???

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Originally Posted by dudeling7

as in do you mean running temp or cold engine? i did mine after warming up the engine.

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Whats the best way to do this? hot or cold?

Need to check compression when the motor is HOT. WOT and crank the motor over.

where do u get ur car comp tested
i want to do it ?

wouldnt it be better for the compressions to be lower since ur considering boost?

i did mine a while ago too.. same across all 4... NOS time

Quote:

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Originally Posted by teaseR

wouldnt it be better for the compressions to be lower since ur considering boost?

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i don't think so. I'm pretty sure a compression test is used to see if your rings are still in good condition

Quote:

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Originally Posted by IZY-10

i don't think so. I'm pretty sure a compression test is used to see if your rings are still in good condition

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thats all a compression test is for - for a more substantial block and head test , do a "leak down" test.

Quote:

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Originally Posted by teaseR

wouldnt it be better for the compressions to be lower since ur considering boost?

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not if ur car is suppost to have a certain amount of compression
Hypothetical example:
ie ITR is suppost to have 230psi over all cyclinders, but comperssion test shows only 170psi over all cyclinders
its got lower compression cause something is not sealing properly in the engine and is letting air/fuel escape

turbo cars run low compression, but thats cause they were designed to make less compression as the cylinders move up and down etc
hope u know what i mean:p

yeh compression test is jsut to test to see the condition of the cylinders and how they are sealed etc.

if you get varying results in a compression test such as 1 cylinder has 180 psi and the rest of them have 230psi then you know you have a problem in this cylinder.

to diagnose this problem you usually will follow with a leakdown test to see where the compression is being lost and usually this will point to a certain area in which you need to get fixed.

i jsut wanted to see the condition of my car before i went ahead and boosted, and surprisingly it was in great condition for its miles.

For a B18B 200psi is usually the max amount and 135psi being the minimum amount, lots of varibales though such as what type of compression meter used as they all yiled different results.

Also if the results show low compression in all cylinders but all 4 cylinders are similar (within 10 or 15% i think) this is more important that the max result that you get. consistency is more important with compression testing.