- Tue Oct 22, 2019 8:03 pm
#86158
I have read your comments papasmurf, and I would back up what the others have said. I think you are using the same words for different things.
For most of us, we understand the sump to be the bottom of the crankcase compartment under the crankshaft. The pre-UCE/EFI design Bullet, whether classic, Electra-X or Electra-ish, is for a DRY sump, i.e. all the oil that gets flung into it from the big end or scraped off the cylinder walls is immediately slurped up (all being well) by the scavenge pump and sent up to the rockers, whence it drains down past the pushrods, into the timing chest and back to the oil tank. NO OIL IS SUPPOSED TO BE STORED IN THE SUMP, most of it lives in the OIL TANK.
The dip stick fits into the oil tank, which is a SEPARATE chamber next to the sump. It is still part of the main crankcase casting, but divided from the crankcase proper by an internal wall, so that oil from the oil tank does not run into the sump unless there's something wrong with the the joint faces.
A certain amount of oil is supposed to remain inside the timing chest, wet sumping occurs when oil leaks from here into the sump. Leakage can occur particularly on the Electra-X where there is no seal behind the timing pinion, it just relies on the high capacity of the scavenge pump to drain it quickly on start-up. Or should do.
A.
For most of us, we understand the sump to be the bottom of the crankcase compartment under the crankshaft. The pre-UCE/EFI design Bullet, whether classic, Electra-X or Electra-ish, is for a DRY sump, i.e. all the oil that gets flung into it from the big end or scraped off the cylinder walls is immediately slurped up (all being well) by the scavenge pump and sent up to the rockers, whence it drains down past the pushrods, into the timing chest and back to the oil tank. NO OIL IS SUPPOSED TO BE STORED IN THE SUMP, most of it lives in the OIL TANK.
The dip stick fits into the oil tank, which is a SEPARATE chamber next to the sump. It is still part of the main crankcase casting, but divided from the crankcase proper by an internal wall, so that oil from the oil tank does not run into the sump unless there's something wrong with the the joint faces.
A certain amount of oil is supposed to remain inside the timing chest, wet sumping occurs when oil leaks from here into the sump. Leakage can occur particularly on the Electra-X where there is no seal behind the timing pinion, it just relies on the high capacity of the scavenge pump to drain it quickly on start-up. Or should do.
A.