Well we got bored yesterday so we did a compression test on my wifes 97 SH model and got some surprising numbers.

I have never come across a 125,000 mile h22 with compression test numbers as high as these. 1=230 2=225 3=225 4=230

Just curious if anyone has numbers on there h22a (jdm or usdm) not euro r or type s?

 

Those are about the same numbers I get on my 97 sh with type s pistons.

 

that seems a little high for a USDM H22a4. However, if the car is running good I would not worry about it.

 

Did you pull the fuel pump fuse or do an equivalent before doing the test?

 

Sometimes gauges vary from one another and also your testing conditions like alttitude, temperature, humidity, etc etc can all slightly change your results. What's important is that each cylinder reads close to each other.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vinuneuro &raquo;</TD></TR><TR><TD CLASS="quote">Did you pull the fuel pump fuse or do an equivalent before doing the test?</TD></TR></TABLE>

What does this do? Not flood the engine? I did a compression test and didn't pull any fuse. I did take the intake off and open the throttle but that's it.

Also what's the deal with using oil in a compression test? Do you just add a little oil on the threads of the compression tester? How does that work?

Sorry if I'm jacking but at least it's on topic

 

You don't want fuel in the cylinders washing down the oil on the cylinder walls, hence you pull the fuel pump fuse.

You add oil to the cylinder you're testing to see if oil will help the rings seal.

 

I believe the compression readings will be higher if you allow fuel to be injected during the test.

 

You know, I never thought about that. Stock 5Gen injectors flow 290 cc/min, so 1 second of flow will result in almost 5cc of fuel (4.833 cc to be exact). If you use this number to calculate CR (basically just remove 4.833 from the combustion chamber volume, or add it to the piston dome volume), you'll see it increases the static CR from 10:1 to almost 10.8:1!!

However, this is assuming the injector actually flows fuel for one full second. It's very doubtful that you'll get an injector to flow that much fuel during a compression test, so take that for what it's worth.

Also my calc assumes all the fuel stays above the compression rings, which is also highly doubtful.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">You don't want fuel in the cylinders washing down the oil on the cylinder walls, hence you pull the fuel pump fuse.

You add oil to the cylinder you're testing to see if oil will help the rings seal.</TD></TR></TABLE>


Ahh I see. Any idea to how much oil you would add to the cylinder? Until it's flush with the spark plug hole or less?

I'm burning quite a bit of oil (aprox 1L every 1000-2000kms, maybe a bit less) and not sure where

I think crank seal is leaking as well but not sure how much as its not dripping on the ground.

 

The compression test won't tell you the condition of the oil control rings, so it's not really going to help you diagnose your problem.

Uh, flush with the spark plug hole? You're kidding right? That would be something like 55 to 60 cc's of oil!! You want to add maybe a table spoon of oil when you do a "wet" test.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 117 &raquo;</TD></TR><TR><TD CLASS="quote">The compression test won't tell you the condition of the oil control rings, so it's not really going to help you diagnose your problem.

Uh, flush with the spark plug hole? You're kidding right? That would be something like 55 to 60 cc's of oil!! You want to add maybe a table spoon of oil when you do a "wet" test.</TD></TR></TABLE>

lol, well I didn't know which is why I asked I didn't literally mean flush, I just threw that out there......yeha that's it

But thanks for the answers. I wasn't sure if doing the test with oil would tell me where the oil is being burned up but I thought I would ask anyways.

The last time I did a test (dry) was with the fuel pump fuse still in and the throttle open and I got around 210 in all 4 cylinders. I figure I should try it with oil to see what comes up.

 

Well guys I did pull the fuel pump fuse and removed all the spark plugs during the test (which I've done on every engine i've tested). I work at a dealership and run comp tests all the time with work and personal engines. I was just really surprised to see those numbers out of an h22, cause my itr motors comp levels were around the same. I know for a fact her motor in internally stock and factory.

Oh well, I guess its from all the maintaince we have done. she nags constantly about keeping her motor "fresh".

 

i had
220 220 220 200
in my 4th gen

that last one worries me a little, but 220 is not far off from you