P Steering pump as oil scavenge pump what do u thk

[Guest]

I'm going to need an oil scavenge pump for my turbo 3900 as I've realized with borderline drain back already, if I park on an incline nose up there's going to be a problem with flow.

I've figured out in the link below that the power steering pump can handle the heat. I'm not sure about the motor oil. If the seals can handle the motor oil, my plan is to use an electric motor, probably a good cooling fan motor with possibly a 2 or 3 to one ratio to operate the pump.

That should offer good durability given the torque loads a cooling fan motor is subjected to turning the fan blades.

The other option is the same scenario using an engine oil pump mounted in a small can driven by an electric motor from the top to work the way it does in the engine.

For expected motor durability, I can measure the current draw on my cooling fan when it's running and compare that to the current draw on the pump in the scavenge arrangement and adjust the motor to pump ratio to the lowest necessary to provide adequate scavenge and reduce the current draw as well.

If the current draw is still less with a direct drive, than it is when turning the fan blade I will not need to reduce the drive ratio.

http://www.gmhightechperformance.com/tech/0602htp_ls1_fbody_turn_one_power_steering_pump_install/photo_11.html

[MidnightriderZ24]

a powersteering pump should work fine, interesting idea.

[Schmieder]

I'm going to need an oil scavenge pump for my turbo 3900 as I've realized with borderline drain back already, if I park on an incline nose up there's going to be a problem with flow.

I've figured out in the link below that the power steering pump can handle the heat. I'm not sure about the motor oil. If the seals can handle the motor oil, my plan is to use an electric motor, probably a good cooling fan motor with possibly a 2 or 3 to one ratio to operate the pump.

That should offer good durability given the torque loads a cooling fan motor is subjected to turning the fan blades.

The other option is the same scenario using an engine oil pump mounted in a small can driven by an electric motor from the top to work the way it does in the engine.

For expected motor durability, I can measure the current draw on my cooling fan when it's running and compare that to the current draw on the pump in the scavenge arrangement and adjust the motor to pump ratio to the lowest necessary to provide adequate scavenge and reduce the current draw as well.

If the current draw is still less with a direct drive, than it is when turning the fan blade I will not need to reduce the drive ratio.

http://www.gmhightechperformance.com.../photo_11.html

You probably could install a large oil cooler to receive the hot oil from the turbo, guide a hardline hose into the oil cooler towards the bottom with a few holes in the sides of the hardhose.

Or you could install a seperate oil cooling system for the turbo. This has some benfits because the turbo actually requires slightly different oil versus the rest of the engine. Oil used for high RPM turbine jets is a better option for a turbo. There is some info out there somewhere if you search it out.

The beauty of an isolated system....keep hot turbo oil out of the engine, keep turbo oil clean and free from debris from the engine, use better oil for the turbo, turbo placement options open up (trunk? lol). I would draw the oil via vacuum throught the oil return on the turbo versus pushing it through the turbo oil feed. You can decide just how much oil you need in reserve which effects over all turbo temp.

I thought of installing 2 strong B&M Oil Coolers with switchable fans and have 1 oil pump and 1 oil vacuum pump. Have the forward pushing oil pump push oil through the cooling system seperate from the turbo but in the same oil system. This way the oil can be pushed through the cooler faster and have a catch can like device to capture trapped air to keep a properly filled system.

[Joseph Upson]

That's a bit off the beaten path for what I'm trying to do. I just need better oil return to the pan. Turbo longevity is well in excess of 100k miles particularly for the water cooled and properly maintained so there would be no reasonable return for me to go through the trouble of installing a separate oiling system for a daily driver. I've decided to use a combination of an engine oil pump driven by a cooling fan motor which I believe will provide the best results given how long the fan motor lasts under normal use (200k miles on a Honda fan motor) but in this case with a lower load. I'll have an o-ring groove cut in the input shaft bore and then thread the inlet and outlet for fittings and fabricate a connecting mount between the motor and the pump. This way I can easily address a motor failure with an off the shelf part.

[Schmieder]

Hehe, sometimes I have to stop myself and reground my thoughts/plans.

Though the topic of an external oiling system for the turbo was an interesting read (can't remember source). It was remarking how motor oil wasn't the best type of oil for a spinning turbine versus the travel and force of a piston. If a seperate oiling system was created then the turbo will benefit in either longetivity or slight performance improvement if the oil was specific for a turbine system, like jet aircraft.

If I was building a drag strip car I would consider it. But a DD is a little extreme and I agree in simplicity.