Compression Test Results
 

1992 Tsi AWD 5spd 6bolt 139k mi
I finally did a compression test today on my car:
Cold, Dry test
#1:105
#2:139
#3:140
#4:148
Wet Test (capful of oil)
#1:135
#2:155
#3:170
#4:175

No wonder my car is so slow...

This means worn rings right (they all went up with wet test, not stay the same i.e. a valve issue)? Time for rebuild...

Re: Compression Test Results
 

No rebuild, just more boost?



J/K

Re: Compression Test Results
 

haha.

Re: Compression Test Results
 

And some NAWWZ!

Re: Compression Test Results
 

yeah thatd be tight yo. lemme bust out my pro fogger fo hizzle 500 shot.

Re: Compression Test Results
 

Sound like you have a plan to even that compression out. To zero.

Re: Compression Test Results
 

Wasn't that motor just rebuilt when Blake owned it. (by shindley)

Re: Compression Test Results
 

ouch man

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Wet test is kinda useless on a motor with dished pistons. The oil just sits in the dish and raises the compression.

Re: Compression Test Results
 

Sounds like your engine is gonna blow up! Just throw a 2.4 in there and be done!! :)

Re: Compression Test Results
 

Thread cleaned up. Keep this thread on topic from here on out. If you aren't giving sleepydsm opinions on his results then shut up and start your own thread. If you want to know how to compression test your own car then start another thread addressing that issue on your own and we will be glad to help.

CRAIG

Re: Compression Test Results
 

Blake didn't mention it to me? I probably screwed it up though.

Re: Compression Test Results
 

It isn't *that* bad except for #1. The engine has to be at full operating temp to get accurate results. Drive the car around for 20 mins and try it again.

Re: Compression Test Results
 

yah we def didnt do that. we'll try it again and post up new ones.

Re: Compression Test Results
 

Glad someone said something about that, it should'd do anything to even out the cylinders though which is actually the bigger issue. Like Shane mentioned, the wet test is somewhat tricky with any dish to the pistons. there is typically .300 above the ring to the crown that oil can ride in without going into the center, but it is a bit tricky to get it in there accurately. I have a few tricks to do it, stop by the shop and I can tell you how if you like.

Re: Compression Test Results
 

I will let you know what kind of difference lower compression makes. I will be testing on a car with (4-1) 140-140-130-90.

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Sounds good. I am redoing the compression test tomorrow, at operating temp just for shits.

Re: Compression Test Results
 

SLEEPYDSM's new test numbers:
1-120
2-130
3-150
4-150
Rings? Headgasket? Is his next step a leakdown test?

Re: Compression Test Results
 

Run 'er til she blows! It is probably valve seals or rings though.

Re: Compression Test Results
 

Ehh, I've seen much worse. I'd leave it and continue driving it as it sits unless you want to be super picky. Boost makes up for compression loss...

ASS (inside joke)

Re: Compression Test Results
 

Alright.

Re: Compression Test Results
 

You meant valve seats right?

Re: Compression Test Results
 

...cause bad valve seals do not make their presence known during a compression test, only a leakdown test, right?

Re: Compression Test Results
 

Valve seals are not in the area that compression happens, so no on leak down test also.

Re: Compression Test Results
 

Gotcha, thanks for the correction. :)

Re: Compression Test Results
 

A leakdown test would be usefull to tell you which was the problem between the rings or the valves. I can always run the new snakey borescope in and see if you don't just have some really crusty exhaust valves or similar if you wanted.

Re: Compression Test Results
 

Yep, was thinking seats and typed seals. :confused:

Re: Compression Test Results
 

Another issue is the quality of the compression gauge being used, and have you floored the throttle during your test? I would trust a Snap-On or similar compression gauge, not some $35 checker unit. Also the next step would be a leak down test, also a Snap-On or similar gauge should be used.

~John

Re: Compression Test Results
 

Thanks for talking to me like I'm a dumbass. I used a Craftsman compression tester. It worked fine; it did what it was designed to do. I did have the throttle at WOT while I turned the engine over during the test. I've been planning on doing a leakdown test ever since I did the compression test. My uncle, who is a mechanic, has a Snap On leak down tester. He, like every other mechanic at my work, has a vast array of Snap-On and MAC tools. I've used many, and I still like "el cheapo" Craftsman. I asked him awhile ago to do a leakdown test for me, but we have not set an exact date to do it. And if necessary, I can just go to QPR.

Re: Compression Test Results
 

Don't blame John for that. You should have stated that you did that during the test. How are we supposed to know how much experience you have?? There are a lot of new guys on the board lately, and most don't know a whole lot. You joined around the same time as them, but you happen to have a better background. Most of us don't know that.

Let us know how the leakdown goes.

Re: Compression Test Results
 

Sleepy I did not talk to you like you are an idiot, I do not know you, I have no idea what you know about cars. So I am sorry if I offended you, I was simply stating that Snap-On or similar Compression and leakdown testers will give you more accurate and consistant test results, this is why I recommended them over the cheaper units.

~John

Re: Compression Test Results
 

You can convert your craftsman gauge into a leak down tester....

Re: Compression Test Results
 

Sorry, I took it as an insult.

And I'm getting the leakdown tester tomorrow. I will post the results ASAP. Thanks for all your opinions, and suggestions (especially the ones I took offensively haha).