turbo LSV issue, oil burn
06-30-2012, 10:55 AM
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turbo LSV issue, oil burn
hello!
build has 27K
everything has been machined, block, pistons, rods, crank, head.
here is a catch
replaced valve stem seals on rebuild of head, did not replace valve guides....
turbo exhaust seal not leaking, no wetness... unbolted downpipe....
leakdown test at 80psi was 10% across the board......
looking for input... ty.
forgot to mention it is a small amount of oil being burned... i would say... a half quart every 2-3K or something around that nature.... but i do see it on high rev...
mostly happens when i boost then decelerate.....
if I dont let the motor brake in gear while i decelerate, i get no smoke...
if i ride froma 4K+ and stay in gear and decelerate... smoke.....
stock bottom end LS
semi built head
12psi
PCV not clogged
build has 27K
everything has been machined, block, pistons, rods, crank, head.
here is a catch
replaced valve stem seals on rebuild of head, did not replace valve guides....
turbo exhaust seal not leaking, no wetness... unbolted downpipe....
leakdown test at 80psi was 10% across the board......
looking for input... ty.
forgot to mention it is a small amount of oil being burned... i would say... a half quart every 2-3K or something around that nature.... but i do see it on high rev...
mostly happens when i boost then decelerate.....
if I dont let the motor brake in gear while i decelerate, i get no smoke...
if i ride froma 4K+ and stay in gear and decelerate... smoke.....
stock bottom end LS
semi built head
12psi
PCV not clogged
Last edited by g0tgot; 06-30-2012 at 11:14 AM.
07-03-2012, 08:34 PM
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Re: turbo LSV issue, oil burn
is it possible that the valve has just enough play to cause damage or crack the valve stem seal and let oil by when it gets hot?
07-03-2012, 08:38 PM
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Re: turbo LSV issue, oil burn
turbine seal
intake valve seals, etc
if you have a minor leak from the turbine seal, you wont notice any wetness, when oil pressure drops just enough oil leaks around the seal to cause an issue, when you get back on it or let off it will smoke
intake valve stem seal could be leaking... you'd never notice it unless you pulled the intake manifold off. same with the exhaust side seals, unless you pull the turbo manifold off you'll never know
intake valve seals, etc
if you have a minor leak from the turbine seal, you wont notice any wetness, when oil pressure drops just enough oil leaks around the seal to cause an issue, when you get back on it or let off it will smoke
intake valve stem seal could be leaking... you'd never notice it unless you pulled the intake manifold off. same with the exhaust side seals, unless you pull the turbo manifold off you'll never know
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