Compression Woes - Tuner-Junction

88 rex · #1 (**permalink**) December 11th, 2006, 09:37 PM

Out of boredom I did a compression test tonight.

Here's what I got

Cyl#1 - 210/210
Cyl#2 - 180/180
Cyl#3 - 200/200
Cyl#4 - 210/210

I wasn't too happy with the 180's so I poured a little oil in cylinder 2 to see how it changed and I got 205

Cylinder #1 went from 210 to 220.

Then I stopped. I didn't really care what I got for the other 2.

I'm kind of bummed, because I assume this means my rings are starting to go? I'm not really sure what to make of this because I don't consume any noticable oil and it only smokes when engaging VTEC. Even then, it's only a little puff, which is normal. Even the oil I poured down the cylinders didn't make the motor smoke, and i poured a cap full in.

Everything sounds healthy and it seems to run healthy. Is this just a small sign of bad things to come or are the numbers not as bad as I think they are?

88 rex · #2 (**permalink**) December 11th, 2006, 09:41 PM

Just realized I forgot to open the throttle to do the compression test and the motor was luke warm at best!!

Oooooppsss!

What that seriously affect the numbers?

A_White_Gs-R · #3 (**permalink**) December 11th, 2006, 10:01 PM

not really but it seems like ring 2 is starting to go.

EyelessCRX · #4 (**permalink**) December 13th, 2006, 07:09 PM

Did you redo it? Im kinda curious to see what you are running.

88 rex · #5 (**permalink**) December 13th, 2006, 08:55 PM

Quote:

Originally Posted by EyelessCRX

Did you redo it? Im kinda curious to see what you are running.

Not yet. I had plenty of time tonight, but turned into a couch potato with the laptop and looked up WHAT IF I need to rebuild this thing come spring.

EyelessCRX · #6 (**permalink**) December 13th, 2006, 09:08 PM

Quote:

Originally Posted by 88 rex

Not yet. I had plenty of time tonight, but turned into a couch potato with the laptop and looked up WHAT IF I need to rebuild this thing come spring.

Sounds like what I do every night. Keep me udated because im gonna check the compression on mine soon.

ksniperfox · #7 (**permalink**) December 14th, 2006, 03:09 AM

how much does a compression tester cost? jw..ill probably look it up on autozone or some shit. but ive never done a compression test so i want to do one. motor was rebuilt by previous owner 3k miles ago but wouldnt hurt to check.

MattTheCommie · #8 (**permalink**) December 14th, 2006, 03:49 AM

Cheap.

They aren't too much, my friend picked one up at Harbor Freight a few months ago, maybe 15 bucks max, even then I think it was on sale for like 8 dollars or something.

wang · #9 (**permalink**) December 14th, 2006, 04:12 AM

There was a guide somewhere on how to make a compression tester. I was gonna find try and find it and build one by christmas time, but lost motivation since Loon won't be back, so no work will be done on the talon.

ksniperfox · #10 (**permalink**) December 14th, 2006, 06:05 AM

fuck making one lol. i was browsing autozone online and theyre <20 bucks.

A_White_Gs-R · #11 (**permalink**) December 14th, 2006, 10:03 AM

Just buy one they are cheap. and i dont think your car has any severe problems the compression wasnt that much lower than the other cylinders anyway im guessing ring is starting to go.

88 rex · #12 (**permalink**) December 14th, 2006, 05:05 PM

Quote:

Originally Posted by MattTheCommie

Cheap.

They aren't too much, my friend picked one up at Harbor Freight a few months ago, maybe 15 bucks max, even then I think it was on sale for like 8 dollars or something.

I have the harbor freight one

triniskill · #13 (**permalink**) December 16th, 2006, 09:39 PM

Could this mean a another TJ crx motor rebuild...

Hey will..are you going to do that clutch on your friends wrx?

jadkar · #14 (**permalink**) December 17th, 2006, 12:18 AM

Will, I wouldn't worry about it too much. It does sound like #2 is starting to wear but then again, the engine is 10 years old and god only knows how many miles. If you're ever back up in my area we can run a leak down test on it and see how you score there.

Interesting my #2 is what died on my engine, I wonder if that cylinder sees any greater than normal stresses.

88 rex · #15 (**permalink**) December 17th, 2006, 06:37 AM

Quote:

Originally Posted by triniskill

Could this mean a another TJ crx motor rebuild...

Hey will..are you going to do that clutch on your friends wrx?

I turned down the clutch job b/c I was afraid of him having too much down time. His buddy has a lift a I told him it was best to let him tear it apart.

Quote:

Originally Posted by jadkar

Will, I wouldn't worry about it too much. It does sound like #2 is starting to wear but then again, the engine is 10 years old and god only knows how many miles. If you're ever back up in my area we can run a leak down test on it and see how you score there.

Interesting my #2 is what died on my engine, I wonder if that cylinder sees any greater than normal stresses.

Interesting. I've heard #3 sees the most heat because of the design of the block.

Do you count the cylinders this was way:

4 3 2 1

???

If I were to count them 1 2 3 4 then my #3, to some people, would be going, which would fit the bill of a normal wear and tear car.

triniskill · #16 (**permalink**) December 17th, 2006, 02:47 PM

Quote:

Originally Posted by 88 rex

I turned down the clutch job b/c I was afraid of him having too much down time. His buddy has a lift a I told him it was best to let him tear it apart.

true..but 2 days is the longest even if you mess up..its not that bad.

88 rex · #17 (**permalink**) December 21st, 2006, 03:29 PM

Checked compression today on that cylinder.

190 and 195 with a warmed up motor and throttle open.

It came up a little, but it's still a sign in my mind that it is dying a healthy life.