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How's the power on the top end if it spools that fast and only 10psi?
I'm sure the turbo runs out of steam. the track I ran on is pretty short, and I plan in keeping the rev's limited until I get the new turbo/headers installed, so it didnt matter too much to me. ill just use 5th gear
not too big of a deal hopefully. Car ran great on track, then I went to load it up on the trailer the other week an she started billowing out blue smoke. #2 cylinder has a lot of oil in it (plug was wet)
put my boroscope down the spark plug hole and I can see oil dripping down the sides of the bores. pulled the intake, and no oil is dripping down the intake valve. Figured it was the exhaust valve.
pulled the head. exhaust valve-valve guide seems great. exhaust valve seal also seems good.
only thing I noticed was a bunch of goop on the head from the gasket. I'm now wondering if I did not clean up the head well enough (maybe not at all) before install, would it be possible for oil to leek into the cylinder that way? figured if it leaked from the valve, it would drip from the valve, and not run down the bores.
there was no oil in the coolant. and the head gasket looked pristine.
I also put a straight edge on the head (after cleaning it up) and can see no high/low spots.
just talked to my head guy. he thinks its rings. oil getting up through the oil scraper ring, then the top ring is pushing oil up. When I look at it with the boroscope, im seeing the oil that was pushed up drip back down.
is there anyway to block off the check valve in the head? I could then get oil pressure and visually see if its rings?
Any reason you went with the 2.7 head instead of the s2 head?
it should work plenty good, less moving parts, easier to deal with, and keeps me in gt2 vs kicking me up to gt1. I'm already not competitive in gt3 or 2.
just talked to my head guy. he thinks its rings. oil getting up through the oil scraper ring, then the top ring is pushing oil up. When I look at it with the boroscope, im seeing the oil that was pushed up drip back down.
is there anyway to block off the check valve in the head? I could then get oil pressure and visually see if its rings?
I'd be inclined to bolt the head back on and do a leak down test...
I pulled the #2 piston, and this has to be the problem:
I'm using wiseco pt098hs pistons. the oil ring land has gaps on each side for the pin. Looks like the oil ring rotated so the end was aligned with the gap.
is this just a bad piston design? would I expect rings to rotate once installed?
You are missing the spacer that goes under the oil ring. It would have been shipped with the pistons; bet you didn't know what the heck they were. The spacer is used whenever the pin bore goes into the oil ring groove and it supports the oil ring rails. You should also have noticed the oil rings were sloppy in the groove since the spacers weren't there.
Originally Posted by dizzyj
update:
I pulled the #2 piston, and this has to be the problem:
I'm using wiseco pt098hs pistons. the oil ring land has gaps on each side for the pin. Looks like the oil ring rotated so the end was aligned with the gap.
is this just a bad piston design? would I expect rings to rotate once installed?
09-14-2015, 05:14 PM
