Reply to "Lane's Beck Super Coupe #3"

I have been looking at the numbers for a Subaru EJ25 piston to cylinder wall clearance.

.003" seems to be the number. This seems high to me and could be the source of the excessive oil consumption.

I recall that we used to try for .004" to reduce drag on the pistons. It was expected that with that much clearance, there would be excessive oil consumption and a tiny amount of smoke from the exhaust.

Many new engines only allow .002 to .0025 clearance. I suspect that the Subaru oil consumption may be from this seemingly excessive amount of clearance. It's possible that Subaru discovered a need for this clearance that we are unaware of.

Any one else have an opinion ? To me, this kind of excessive oil consumption is not acceptable. Probably Total Seal rings would eliminate the problem. Only problem is....total disassembly to install a set................Bruce

2/4/205:29 PM

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