Anthony Boni
5+ Year Contributor
- 213
- 23
- May 13, 2018
-
Wrightstown,
New_Jersey
As the title states, I’m burning oil in boost. I can see blue smoke behind me when I get into higher boost (25+ From a FP Red). Then when I let off, the smoke goes away. If I start accelerating again, there’s a bunch of blue/white smoke for about 5 seconds.
I compression and leakdowns tested today, here are the results-
1 cylinder: 9% leakdown, 190PSI compression
2 cylinder: 8% leakdown, 195PSI compression
3 cylinder: 6% leakdown, 200PSI compression
4 cylinder: 8% leakdown, 195 PSI compression
I also pulled off my FP intake pipe from my turbo. There was literally one drop of oil, but no real evidence of oil in the compressor side. It looks very clean.
I removed my LICP to see if there was any oil, and it’s very hard to tell. I don’t really see much of anything inside of the pipe. Just a slight film on the walls. But no oil pooling as I would have expected with how much oil is being burnt.
The bottom end seems very healthy. High compression numbers (9.3:1 motor) and low leakdown percentage. I don’t suspect high blow by, even though I have a .050” PTW clearance with a .026” top ring gap. I have an excessively efficient crankcase ventilation system because I built the motor a little loose for higher boost applications. The turbo is being fed from the OFH (BSD) with a restrictor. The drain is a 10AN from extreme PSI (perhaps the drain needs to be larger?).
No smoke at idle or while cruising, only when I go into boost. I’m suspecting the turbo, but I have nothing to back that up. Zero in and out shaft play. Slight side to side. MAYBE oil is getting past the turbine and burning in the exhaust, but I’m not sure how to prove that.
Maybe it’s coming from the head? Bad valve guides? Valve seals typically leak and burn oil at idle and start up. But stranger things have happened..
Any help would be awesome. Thanks!
I compression and leakdowns tested today, here are the results-
1 cylinder: 9% leakdown, 190PSI compression
2 cylinder: 8% leakdown, 195PSI compression
3 cylinder: 6% leakdown, 200PSI compression
4 cylinder: 8% leakdown, 195 PSI compression
I also pulled off my FP intake pipe from my turbo. There was literally one drop of oil, but no real evidence of oil in the compressor side. It looks very clean.
I removed my LICP to see if there was any oil, and it’s very hard to tell. I don’t really see much of anything inside of the pipe. Just a slight film on the walls. But no oil pooling as I would have expected with how much oil is being burnt.
The bottom end seems very healthy. High compression numbers (9.3:1 motor) and low leakdown percentage. I don’t suspect high blow by, even though I have a .050” PTW clearance with a .026” top ring gap. I have an excessively efficient crankcase ventilation system because I built the motor a little loose for higher boost applications. The turbo is being fed from the OFH (BSD) with a restrictor. The drain is a 10AN from extreme PSI (perhaps the drain needs to be larger?).
No smoke at idle or while cruising, only when I go into boost. I’m suspecting the turbo, but I have nothing to back that up. Zero in and out shaft play. Slight side to side. MAYBE oil is getting past the turbine and burning in the exhaust, but I’m not sure how to prove that.
Maybe it’s coming from the head? Bad valve guides? Valve seals typically leak and burn oil at idle and start up. But stranger things have happened..
Any help would be awesome. Thanks!