major oil consumption on new turbo build
#1
major oil consumption on new turbo build
1999 stock 1.8 litre with 75K miles; did not burn much oil if at all
MSPNP gen2 with 20 PSI turbo never been past 10 psi
with the new turbo, 1 quart/70 miles or so
Added valve cover venting; still burning oil
Had the head rebuilt. Still burning oil.
Did the compression and Leak-down tests with engine up to running temperature.
Cyl 1, plug dry, 195 comp, 4% leak
Cyl 2, plug dry, 195 comp, 5% leak
Cyl 3, plug dry, 195 comp, 5% leak
Cyl 4, plug dry, 197 comp, 5% leak
Sometimes with boost and sometimes without boost. it blows smoke
I think I have enough venting of the valve cover but it is mostly running through the OEM baffles. A couple lines are connected to the turbo intake for vacuum. PCV removed and vented to air with 1/2 inch port and hose
With the compression and Leak numbers, it doesn't look like rings (to me. but what do I know). Could it be a crack internal to the head causing oil to leak into the valve port? I have no idea where the oil journals and passage ways are in the head????
MSPNP gen2 with 20 PSI turbo never been past 10 psi
with the new turbo, 1 quart/70 miles or so
Added valve cover venting; still burning oil
Had the head rebuilt. Still burning oil.
Did the compression and Leak-down tests with engine up to running temperature.
Cyl 1, plug dry, 195 comp, 4% leak
Cyl 2, plug dry, 195 comp, 5% leak
Cyl 3, plug dry, 195 comp, 5% leak
Cyl 4, plug dry, 197 comp, 5% leak
Sometimes with boost and sometimes without boost. it blows smoke
I think I have enough venting of the valve cover but it is mostly running through the OEM baffles. A couple lines are connected to the turbo intake for vacuum. PCV removed and vented to air with 1/2 inch port and hose
With the compression and Leak numbers, it doesn't look like rings (to me. but what do I know). Could it be a crack internal to the head causing oil to leak into the valve port? I have no idea where the oil journals and passage ways are in the head????
#11
Do the plugs look anything like the tops of those pistons? Cause those pistons look like they've been chewing on ALLOFTHEOIL.
#12
Fouled would be a great description. Similar to the plug on the far right from your video. I cleaned the piston heads, had the head rebuilt, and still burning the same amount of oil. I was not positive the head rebuild would fix the problem but it was the quickest and cheapest attempt I could make.
Last edited by newwithturbos; 09-23-2017 at 07:28 AM. Reason: Adding info
#19
I closed off all the additional venting I did for the valve cover. I installed a check valve (PCV) and fed it back to the 3/8 port on the intake. Started it and no smoke for a while. I have a port on the turbo oil return in case I wanted to vent it. When I removed the cap, I had vacuum from the oil pan (I put the plug back in). After a bit, I was getting billowing white smoke. I am hoping this is just carbon burning off but not sure. Very white smoke like you get when you Seafoam the intake. I let it run for a few minutes longer but it is in my garage and the wind was blowing in...I am planning to let it cool and take it our for a bit (again, just like when you seafoam) and running up the rpms. Maybe the white smoke will stop after a bit? I am not usually that lucky so maybe not.