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Old 09-22-2010, 07:28 PM   #1
EsubaruJ
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Default Compression testing

Is there a way to accurately test the compression of an engine that is out of the car? I have read a few threads regarding this subject but haven't really been able to find a clear answer, some say yes, some say no. I would assume you can put the tester in the cylinder then crank the engine by hand using the bolt on the crank pulley, but are you going to be able to generate enough rpm's by hand cranking the engine to get an accurate reading? And if someone can tell me the size of the crank pulley bolt on a subaru engine(EJ20K) that would be great, iirc, its a 22mm but I could be wrong.
thanks
Chris
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Old 09-22-2010, 08:15 PM   #2
car_cursed
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Yes you can hand crank the engine.
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Old 09-22-2010, 08:35 PM   #3
Bones702
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Just pull all of the spark plugs. That will help turn it over a little faster.
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Old 09-22-2010, 09:06 PM   #4
bhhamblin
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Do a leak down test. Not a compression test. Its better than a compression test and will tell you where the leaks are coming from. (no im not talking about a boost leak test)
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Old 09-22-2010, 09:13 PM   #5
EsubaruJ
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I will try both, I'm sure I can find a link on how to perform a leakdown test. Thanks everyone! Does anyone have a leakdown tester? I assume its a different unit than a compression tester.
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Old 09-22-2010, 09:30 PM   #6
bhhamblin
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Checker or Autozone
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Old 09-22-2010, 10:28 PM   #7
EsubaruJ
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Most of the tutorials I read say to do both of these tests while the engine is warm. I obviously wont be able to get it warm, as its not wired up yet. How bad will that effect the outcome of the results?
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Old 09-22-2010, 10:37 PM   #8
bhhamblin
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Ive tested both warm and cold. its like 2-10%. Nothing enough to worry about.
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Old 09-22-2010, 10:48 PM   #9
EsubaruJ
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Cool, thanks!
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Old 09-23-2010, 03:40 AM   #10
EsubaruJ
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Default

Well, I wasn't able to even compression test the engine, but after looking at the car, it needs a lot. It will need everything besides the transmission to complete the 5 spd swap thats in it. I was really excited about this car, but unfortunately I just wont be able to finish the project without more funds. I am pretty bummed, but I just don't want to take on another project I can't finish. We all know how well my last project went over.. Hopefully something happens and I can still get it. But my hopes aren't high. Well I just needed somewhere to vent lol. This thread can be closed or deleted or whatever. Thanks for everyones input.
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Old 09-23-2010, 10:37 AM   #11
Bones702
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......?

Lets hear some details man.
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