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Old 04-09-2009, 03:38 PM   #1 (permalink)
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I put in a high comp. piston and now i have oil coming up from my crankcase vent. I havent done a leak down test yet but has anybody seen this or have a fix.I should mention oil is at right level.
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Old 04-09-2009, 04:49 PM   #2 (permalink)
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How much oil sledneck ?? ...... a few drops ?? ... a little ?? ... or a lot ?? ... must be some blowby from the compression getting down into the crankcase .... but I'm guessing .......... hopefully, someone with more internal knowledge will chim in soon .........

Later ..........
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Old 04-09-2009, 08:22 PM   #3 (permalink)
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Level OK ? Any chance its gassy smelling oil?
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Old 04-09-2009, 09:54 PM   #4 (permalink)
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just throwin' this out there, but you didn't happen to line up the ring grooves did ya?
something has to be causing pressure in the crankcase, and compression is about the only thing that'll do that. if it was a ventilation problem (oil gets hot, has to push the increased air pressure somewhere) then it wouldn't be coming out the vent, it would be pushing it past a seal. but since the oil is coming from the vent, the vent has to be clear. that only leaves blowby.

the ring end gaps aren't too big?

was the cylinder bored or at least honed?

did you use synthetic oil for break in? synthetic is NOT recommended for break in, because it works TOO well and will not let the rings seat.
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Old 04-10-2009, 09:02 PM   #5 (permalink)
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Rings are all the way they are supposed to be. There is enough oil maybe 50ml. Thanks for the though on synthetic i overlooked that and used synthetic. Maybe they will seat goin riding tomorrow. And the carb and valves are all good no gas coming back through.Though i should mention it was deglazed and everything was measured in spec.
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Old 04-10-2009, 09:43 PM   #6 (permalink)
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Keep us posted sledneck .... and I sure hope the rings do finally seat !

Good call Hammer ....

Later ....
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