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Guest Message by DevFuse

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Compression Test Results

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2 replies to this topic

#1 DirtyMech


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Posted 02 November 2005 - 05:47 PM

Here are the results of my compression test using an Actron Sunpro compression gague from Summit Racing equipment. The compression gague is the type that keeps the needle at the highest reached pressure until the release button is pressed. The engine is a EA82 from a 1985 DL 2WD, and I recently dismantled it, cleaned it, and put in fresh gaskets. Each number is a composite of two indivdual tests (tests were pretty consistent):

Cylinder 1: 185
Cylinder 2: 175
Cylinder 3: 190
Cylinder 4: 190

Look pretty good? All cylinders are within 10% of each other, although it's somewhat close at about 8% difference between C2 and C3/4. The strange thing is that the two cylinders closer to the front of the engine are exhibiting greater wear. I wonder if this is common in Subarus?

I held off on putting new piston rings in and reconditioning the cylinder heads until I got these results back. I never did a proper compression test before I removed the engine because I wanted to clean the sucker, and paint the inside of the engine compartment.

Now I guess the next step would be for me to put everything back together and see if my original problem, the engine dying as it approaches idle speed, has gone away or still persists. Either way I can rule out bad engine compression as the cause of the problem....right? ...right.

#2 idosubaru


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Posted 03 November 2005 - 10:18 AM

doubt compression is an issue. those numbers look really high though. i would have expected around 160 for this motor, am i missing something? older soobs had 160 or less and newer ones have around 210 or so. that's what i thought anyway for the NA cars.

#3 nipper


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Posted 03 November 2005 - 10:36 AM

Those are really healthy number. I wouldnt mess with them.


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