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compression test H23a1

 
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Old 03-30-2013, 02:42 PM
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Icon13 compression test H23a1

so over the weekend I did a compression test on my cylinders and found my numbers to be in my opinion... kinda low i suppose. from right to left it was about 90psi across the engine. I googled a tid bit and seen other people doing tests and there engines(h series) pulling 160s and 180s!! for my engine having over 200,xxx miles is 90psi bad??
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Old 03-30-2013, 07:09 PM
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Re: compression test H23a1

Compression number results vary due to altitude, warm/cold engine, air temp, tester being used, as well as other factors.


Which is why its more important to have consistent numbers, rather than going for the highest numbers possible.
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Old 03-30-2013, 07:25 PM
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Re: compression test H23a1

Consistant is good.. 90 isn't ideal but like V6 said factors can raise or lower your numbers. But I'd be stoked with 200+k miles and 90 across the board.
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Old 03-30-2013, 07:52 PM
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Re: compression test H23a1

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Originally Posted by twokexlv6coupe View Post
Compression number results vary due to altitude, warm/cold engine, air temp, tester being used, as well as other factors.


Which is why its more important to have consistent numbers, rather than going for the highest numbers possible.

hhhmmmm i see. Well with all that being said my numbers were consistent so im not going to worry to much about em. thanks
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Old 03-30-2013, 07:53 PM
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Re: compression test H23a1

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Consistant is good.. 90 isn't ideal but like V6 said factors can raise or lower your numbers. But I'd be stoked with 200+k miles and 90 across the board.

hey if your stoked than im stoked LOL!
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Old 03-30-2013, 08:08 PM
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Re: compression test H23a1

Ya im toked too! wait, what??
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Old 03-30-2013, 08:40 PM
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Re: compression test H23a1

Was that a cold(dry) or hot(wet) test?
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Old 03-30-2013, 08:52 PM
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Re: compression test H23a1

Wet the way to go dbd? Or should op do both?
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welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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Old 03-30-2013, 08:57 PM
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Re: compression test H23a1

I would do both. it's not a whole lot of work. Do one dry (engine completely cold, after sitting overnight or something like that). Record your results. Second time around, let the car warm up to temp, then take a small amount of oil (teaspoon-ish), pour it into the spark plug hole of the cylinder you want to test, and repeat the test for all 4 cylinders that way. You should get higher comp numbers when you do the hot/wet test. This isn't really necessary, but if you get consistent readings from a dry test, then do a wet test and don't get consistent readings, you'll know your motor isn't as healthy as it could be (i.e. Cylinder 1 - 180 psi, Cylinder 2 - 180 psi, Cylinder 3 - 130 psi, Cylinder 4 - 180 psi, you probably got some pretty worn rings on cylinder 3).
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Old 03-31-2013, 09:51 AM
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Re: compression test H23a1

Yea the wet test is just a test to see if your piston rings are worn or not.
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if it's knocking, don't answer it. it's prolly nothing but bad news bears.
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Old 03-31-2013, 09:18 PM
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Re: compression test H23a1

The wet test with the oil seals the rings better. If your numbers dont go up with a wet test, I think it may need a valve job or something like that.
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Old 03-31-2013, 11:14 PM
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Re: compression test H23a1

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Originally Posted by Adrenaline_junkie View Post
The wet test with the oil seals the rings better. If your numbers dont go up with a wet test, I think it may need a valve job or something like that.
You have to watch the way the pressure builds during the test. If the pressure is low on the first stroke, and increases on the next strokes but is still under spec it is most likely the rings. If the pressure is low on the first stroke and barely increases on the next strokes then the valves are most likely leaking.
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Originally Posted by twokexlv6coupe View Post
if it's knocking, don't answer it. it's prolly nothing but bad news bears.
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As much as I'd love to see this done, I offer you the same comment I offer everybody else: There's no point in being the first to do something if you're second across the finish line.
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Old 04-06-2013, 12:23 PM
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Re: compression test H23a1

Compression tests can tell alot. I have to do some more reading about what a leakdown test is all about and how it will tell you what is going on with your internals.
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Old 04-06-2013, 12:42 PM
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Re: compression test H23a1

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Originally Posted by static420 View Post
Ya im toked too! wait, what??
...ya what!? xD
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Old 04-06-2013, 12:45 PM
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Re: compression test H23a1

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Originally Posted by dbd6604 View Post
Was that a cold(dry) or hot(wet) test?
hot dry....

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Originally Posted by dbd6604 View Post
I would do both. it's not a whole lot of work. Do one dry (engine completely cold, after sitting overnight or something like that). Record your results. Second time around, let the car warm up to temp, then take a small amount of oil (teaspoon-ish), pour it into the spark plug hole of the cylinder you want to test, and repeat the test for all 4 cylinders that way. You should get higher comp numbers when you do the hot/wet test. This isn't really necessary, but if you get consistent readings from a dry test, then do a wet test and don't get consistent readings, you'll know your motor isn't as healthy as it could be (i.e. Cylinder 1 - 180 psi, Cylinder 2 - 180 psi, Cylinder 3 - 130 psi, Cylinder 4 - 180 psi, you probably got some pretty worn rings on cylinder 3).

I was considering doing a cold test but the guy at the auto parts store said only to do it when its warm to get best results...only had the tester for a day or two to test an engine for this car i was getting but it didnt work out so i just tested my own engine since I rented the tool. Never knew or heard about pouring the oil into the spark plug hole of the cylinder! All my readings where consistent thankfully but my numbers were really low but alright for an engine that has 200,xxx miles and was abused by some dumb teenager..
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Old 04-06-2013, 12:46 PM
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Re: compression test H23a1

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Yea the wet test is just a test to see if your piston rings are worn or not.
Learn something new everyday!
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Old 04-06-2013, 02:06 PM
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Re: compression test H23a1

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Originally Posted by Adrenaline_junkie View Post
Compression tests can tell alot. I have to do some more reading about what a leakdown test is all about and how it will tell you what is going on with your internals.
You could have a "hissing" sound coming from inside your head/block, or bubbles coming up out the rad. IF there are leaks.

Leak-Down Test vs. Compression Test on 4Strokes.com Forums

Leakdown test help needed INFORMATIVE

maybe this will get you feeling comfy with the whole process..
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Old 04-06-2013, 04:56 PM
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Re: compression test H23a1

Thanks
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Old 04-06-2013, 05:04 PM
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Re: compression test H23a1

No prob, keep us posted, I luuuuv leakdowns
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Old 04-06-2013, 06:19 PM
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Re: compression test H23a1

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Originally Posted by Vipers4Life View Post
You have to watch the way the pressure builds during the test. If the pressure is low on the first stroke, and increases on the next strokes but is still under spec it is most likely the rings. If the pressure is low on the first stroke and barely increases on the next strokes then the valves are most likely leaking.

Good info! Rep'd ya green
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...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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Quote:
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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