david85
Full Access Member
George you pretty much said it better than I could. I'm still on the fence too, and yes I want it to work but not if it would come at the expense of reliability.
Oilless Turbocharger?? (remote mount option)
- Thread starter david85
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BDCarrillo
Full Access Member
How about a separate oil system? Gravity drain turbo into large sump, and pump out through an oil cooler and bypass/regulator into the turbo? Scavenge pumps are rated to be supply pumps as well, so sort of two birds with one stone... If you could fit a sump underneath, behind the cab.
Wondered about that myself. I would think it would run cooler and the oil would stay clean for a really long time. You could probably get away with a little lighter oil to minimize cold start problems.
david85
Full Access Member
I would consider it, provided there was a hobbs switch on the feed side of the oiling circuit to warn the driver of lost oil pressure. I like electric motors and electronics (big reason I built my electric car), but its very tough to beat the reliability of a straight mechanical gear pump. The electric oil pump would also have to be well shielded from the elements, although I'd probably insist on an effective splash guard for the turbocharger as well.
SDEconVan
Full Access Member
Genius! This is a great thread! A closed, segregated lube system may work, the hardest part is to mimic the
"supply and demand" which basically is the same pressure as that in the engine- meaning, high oil pressure in
the crankcase is usually when more oil pressure is needed for the turbo.
Maybe there is a turbo out there that will function with a constant oil pressure?
(Shoot there's oilless turbos...
)
I don't even know if the typical turbo has a minimum head pressure (oil pressure) because if it does, the system
is pressurized. I know that pressurized oil enters the journals of the turbine body, then it is allowed to drain free,
post journals, (sort of like the "total loss system" of some 1900's-1940's motorcycles, except it is caught and returned
to the crankcase.) IF the system is pressurized, and the head pressure of raising the oil up above the turbo is less
than inlet line pressure, then we have an option. My guess is increasing the effort to get the oil out of the turbo is
not a good idea (but again, I don't know yet.) In that case, excess oil WILL find a way, IF the turbo design is "right,"
to the fuel charge, thus increasing the engine rpm, thus increasing the turbo rpm, thus... ...BLAM, you're done.
That is why I was suggesting some sort of "settling pond" post (and below) turbo, then oil is harvested from this
device, up, to another sump (where oil levels could be monitored,) OR oil could be directly deposited into the crankcase.
A lift pump would be in there somewhere, probably controlled by some sort of "go, no-go" criteria.
Anyways, I have a ton of other ideas, but don't want to pollute the thinking of other members too much
There's a pretty cool remote twin turbo kit for a Corvette, and the turbos live in the REAR corners, maybe I'll have
a look how they maintained lubricity on those little jobbies...
Best regards,
George
"supply and demand" which basically is the same pressure as that in the engine- meaning, high oil pressure in
the crankcase is usually when more oil pressure is needed for the turbo.
Maybe there is a turbo out there that will function with a constant oil pressure?
(Shoot there's oilless turbos...
)I don't even know if the typical turbo has a minimum head pressure (oil pressure) because if it does, the system
is pressurized. I know that pressurized oil enters the journals of the turbine body, then it is allowed to drain free,
post journals, (sort of like the "total loss system" of some 1900's-1940's motorcycles, except it is caught and returned
to the crankcase.) IF the system is pressurized, and the head pressure of raising the oil up above the turbo is less
than inlet line pressure, then we have an option. My guess is increasing the effort to get the oil out of the turbo is
not a good idea (but again, I don't know yet.) In that case, excess oil WILL find a way, IF the turbo design is "right,"
to the fuel charge, thus increasing the engine rpm, thus increasing the turbo rpm, thus... ...BLAM, you're done.
That is why I was suggesting some sort of "settling pond" post (and below) turbo, then oil is harvested from this
device, up, to another sump (where oil levels could be monitored,) OR oil could be directly deposited into the crankcase.
A lift pump would be in there somewhere, probably controlled by some sort of "go, no-go" criteria.
Anyways, I have a ton of other ideas, but don't want to pollute the thinking of other members too much
There's a pretty cool remote twin turbo kit for a Corvette, and the turbos live in the REAR corners, maybe I'll have
a look how they maintained lubricity on those little jobbies...
Best regards,
George
