I've been running the bike in the garage to create logs with the LM-2 and make some final checks. I noticed the bike sometimes smokes the first couple minutes, and depending on how long it was running, oil enters the exhaust right after I shut it off.
I'm using the Emtes Oil Scavange Pump and I'm sure the pump and all the oil lines going to (1/4") and from (1/2") the turbo are correct, including the outlet vent hose (1/4") required by the Emtes pump. I also have check valves installed at the turbo both at the inlet and outlet which should prevent this sort of thing.
Tonight I replaced the vent hose with clear hose. No oil backed up into the vent hose until I shut off the bike. At that point about 7" of the vent hose filled with oil within a minute or so. The level did evenutally drops to 5" or so but that missing 2" is probably in the exhaust pipe. When I start the bike, the oil in the vent hose immediately gets sucked in by the Emtes pump and everything is fine until I shut off the bike, at which point the process repeats itself.
I'm thinking that when I shut off the bike the pressure in the oil line going to the turbo takes a while to drop, which keeps the check valve from closing right away, allowing additional oil to continue flowing into the turbo. Having a high volume oil pump gear could be very well adding to this problem, if not the cause of the problem.
Okay, this is somewhat related to another post I made about a restrictor in the oil line between the check valve and the turbo. Only now I'm trying to figure out if the restrictor will fix the problem or if I need another check valve that requires a higher opening pressure.
If anyone has any thoughts, go for it.
I'm using the Emtes Oil Scavange Pump and I'm sure the pump and all the oil lines going to (1/4") and from (1/2") the turbo are correct, including the outlet vent hose (1/4") required by the Emtes pump. I also have check valves installed at the turbo both at the inlet and outlet which should prevent this sort of thing.
Tonight I replaced the vent hose with clear hose. No oil backed up into the vent hose until I shut off the bike. At that point about 7" of the vent hose filled with oil within a minute or so. The level did evenutally drops to 5" or so but that missing 2" is probably in the exhaust pipe. When I start the bike, the oil in the vent hose immediately gets sucked in by the Emtes pump and everything is fine until I shut off the bike, at which point the process repeats itself.
I'm thinking that when I shut off the bike the pressure in the oil line going to the turbo takes a while to drop, which keeps the check valve from closing right away, allowing additional oil to continue flowing into the turbo. Having a high volume oil pump gear could be very well adding to this problem, if not the cause of the problem.
Okay, this is somewhat related to another post I made about a restrictor in the oil line between the check valve and the turbo. Only now I'm trying to figure out if the restrictor will fix the problem or if I need another check valve that requires a higher opening pressure.
If anyone has any thoughts, go for it.
