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

 

Numbers are too far apart =[

 

power is still there but losing oil with no leak or smoke is time for a rebuild?

 

140 vs 105? i'd say YES

 

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.

 

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.

 

Oil on the plug threads?

 

no oil on plug threads, ill do a test again today and report back

 

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

 

Piston rings and possibly head gasket.

 

Broken ring lands.

 

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

 

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.

 

wouldn't bad ring land give a much lower compression reading?