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low compression test

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Old Jun 17, 2017, 05:30 PM   #1
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Unhappy low compression test

I would like to get everyone's opinion on my compression test results on my evo 5

1: 110
2: 140
3: 115
4: 105

The modifications for this engine are
manley H beam rods
manley pistons

I just changed the oil and there was no coolant in it and there is no oil in my coolant but the engine is losing oil no leaks and no blue smoke
milage 166,491 km/h

Thanks for your help ahead of time
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Old Jun 17, 2017, 07:23 PM   #2
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Numbers are too far apart =[
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Old Jun 18, 2017, 05:13 AM   #3
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power is still there but losing oil with no leak or smoke is time for a rebuild?
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Old Jun 18, 2017, 08:57 AM   #4
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140 vs 105? i'd say YES

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power is still there but losing oil with no leak or smoke is time for a rebuild?
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Old Jun 18, 2017, 12:37 PM   #5
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Numbers are definitely too far apart. Your next step is determining the issue: rings, gasket, valves? Put a little oil in the cylinder and see if the compression increases. That'll help narrow things down.
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Old Jun 18, 2017, 01:53 PM   #6
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Make sure you are getting a good compression reading - engine warm, throttle open and fuel off. Then drive it a day and do the test again. Sometimes a bit of carbon can unseat a valve but next day it will be gone. I remember compression testing and finding a bad cylinder and next day retesting and again finding a bad cylinder but it was a different cylinder.
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Old Jun 19, 2017, 01:23 AM   #7
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Oil on the plug threads?
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Old Jun 19, 2017, 05:01 AM   #8
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Oil on the plug threads?
no oil on plug threads, ill do a test again today and report back
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Old Jun 19, 2017, 11:26 AM   #9
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so i did the compression test again got different numbers this time

dry test
1: 125
2: 155
3: 110
4: 130
wet test
1: 140
2: 170
3: 125
4: 150

there was oil on 3 and 4 spark plug threads
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Old Jun 19, 2017, 11:38 AM   #10
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Piston rings and possibly head gasket.
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Old Jun 19, 2017, 02:37 PM   #11
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Broken ring lands.
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Old Jun 19, 2017, 02:46 PM   #12
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Numbers are low enough that you are not making all the power you could and idle won't be as smooth. On the other hand, its enough compression to fire and run. How much oil consumption?
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Old Jun 19, 2017, 03:03 PM   #13
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Numbers are low enough that you are not making all the power you could and idle won't be as smooth. On the other hand, its enough compression to fire and run. How much oil consumption?
about a 1/2 quart or a little over every 200miles
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Old Jun 19, 2017, 04:01 PM   #14
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Dealing with a similar issue here and have come to the conclusion that my motor needs to come out. Have you performed a leak down test? Regardless of the results, if you can confirm that your crank case pressure is under control, your turbo CHRA isn't eating the oil, your valve guides, and valve stem seals are not bad, then your rings or ring lands will be the next in line for replacement. Believe me I know it sucks.

Also I think the 4g63 cylinder head only gets oil pressure/supply from one tear drop shaped hole on the timing side of the block. The rest are oil return galleys so it's not like they are under any sort of pressure.

I'm burning a quart every 100 miles. It's retarded.
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Old Jun 21, 2017, 05:24 AM   #15
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wouldn't bad ring land give a much lower compression reading?
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