Quote:
Originally Posted by ohcbird
Jody-
I was looking at your pics & trying to figure out if the drains were working against the bottom of the sump (however, they look like they go to the front end sides of the pan)- might they be backing up against oil in the sump? If so, would it be possible to put a check valve inline (uphill) on each return line?
I know it's a pain, but I'd do a 'weep' check on the hot side before removing it. I've found bad seals by running a Q-tip in the area where the oil will puddle inside the turbine housing. This could eliminate your drain system from being at fault.
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I think the drains are fine. I spoke with a friend who is pretty much a guru on turboed LSX's (thanks Kurt Urban!!!!!!!!), and he thinks it's too much oil pressure at idle causing the issue. Often it's only one turbo that exhibits it and he used restrictors in the oil feed line to get the pressure at the turbo in the 5-9 psi range. Still plenty of oil, but eliminates the oiling issue at idle, which is where mine seems to be.
I guess as the turbos spool they naturally direct oil down the drain lines, but at idle they aren't moving fast enough to do that and can easily back up in the turbo itself and push oil past the seal. There is no liquid oil coming out the downpipe, so it's pretty minor. And it does not appear to smoke at all cruising down the road, only at idle. It just doesn't take much oil in a hot exhaust pipe to get smoke though...........