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  #11  
Old 25th January 2017
mc2032 mc2032 is offline
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turbo, this works by diverting a certain amount of oil back to the tank. Sportsters are pretty much all roller bearing motors and need oil volume not pressure. at less than 5400 rpms (factory redline?) the pump supplies enough oil and the scavenge side of the pump (gravity fed) can keep up. At high/sustained rpms, the scraper inside the cases plus gravity and some positive crankcase pressure cannot get the oil out of the cases and cam chest fast enough, hence wet sumping. by bleeding off some of the excess oil the scavenge side should be able to pull the oil out and back to the tank.
the cases are pressurized somewhat. this pressure from the rotating assembly plus a little blow by helps push the oil out of the cases. I put breather heads and a weak pump on the bike and made my own exxon valdez. pipe plugs and a fresh pump plus the bypass hopefully should cure what ails the bike. I hope.
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  #12  
Old 26th January 2017
Turbo Sporty 48 Turbo Sporty 48 is offline
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Default Decreased Oil Flow and Pressure?

Quote:
Originally Posted by mc2032 View Post
turbo, this works by diverting a certain amount of oil back to the tank. Sportsters are pretty much all roller bearing motors and need oil volume not pressure. at less than 5400 rpms (factory redline?) the pump supplies enough oil and the scavenge side of the pump (gravity fed) can keep up. At high/sustained rpms, the scraper inside the cases plus gravity and some positive crankcase pressure cannot get the oil out of the cases and cam chest fast enough, hence wet sumping. by bleeding off some of the excess oil the scavenge side should be able to pull the oil out and back to the tank.
the cases are pressurized somewhat. this pressure from the rotating assembly plus a little blow by helps push the oil out of the cases. I put breather heads and a weak pump on the bike and made my own exxon valdez. pipe plugs and a fresh pump plus the bypass hopefully should cure what ails the bike. I hope.
Thanks for your help in this.
Decreased Flow and Pressure?
Obviously too much oil at high rpms leading to wet sumping. Is this supply bypass what is done rather than increase the scavenge capacity from that side of the pump? Maybe increasing scavenging is not reasonable.
The oil supply and drain for my turbo comes off ports in the cam cover.
This is why I want to understand this clever device.
But almost certainly, the turbo bike has wet sumping.
Hopefully not too much of a diversion for you but you certainly will address wet sumping.
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  #13  
Old 26th January 2017
mc2032 mc2032 is offline
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Pressure at idle will be lower per which main jet you install in the bypass. A CV45 main jet per the link is something like .052 i.d.. if you think about your oiling system, most passages are not much bigger'n that. as rpms increase so does volume and pressure. with the bypass, you are just bleeding off some of the volume but pressure should stay the same (hopefully). "excess" oil not being/able to be passed thru the motors oiling passages will be returned to the tank.
on old 4 speeds there is one choice for a better pump/scavenge and that is a proflow pump (no longer being made and if you can find one, it's not for sale). later model sportster can upgrade to a buell pump (don't now the make/model)
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  #14  
Old 26th January 2017
Turbo Sporty 48 Turbo Sporty 48 is offline
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Really interested in your build.
Hoping you post so we can follow.
Thanks for your help.
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  #15  
Old 29th January 2017
Sporty626 Sporty626 is offline
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Sounds like you have a good plan for trying out the E-85. I know what you mean about using back roads for testing. Coming up on tractors is not fun.
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