Turbo Oil Scavenge Pump

Natchamp · 05-27-2003, 02:52 PM

Ok gurus’, I need some help. I am trying to decide what to do for a turbo oil scavenge pump and can’t come to any clear conclusions. My base motor is a 78 so the cam does not have the stock accommodations to drive a pump. However, I will be taking the heads off anyway so if the best overall solution is to have the cam machined, that is ok. From what I have gathered, these are my basic options:

a) Buy an aftermarket oil pump from Power-Tech, TPC, etc. that is driven off the cam, have the cam machined to accommodate. These aftermarket pumps are based on a VW oil pump. Cost would be @ $600 for the pump, $?.?? For the machining.

b) Buy a new or used stock Porsche scavenge pump and have my cam ground to accommodate. I don’t know what the cost of these pumps are. ? According to Power-Tech’s website their aftermarket pump flows better than Porsche’s stock pump.

c) Buy a VW oil pump, machine a housing with my mill, and drive it off my crank pulley via a cogged belt. I already have some cogged pullies so this is my least costly option at @ $30 for a VW oil pump. However, I’m a little shy of wandering too far off into the R&D world cause I’ve been there for the last 3 years.

d) Buy a single stage dry sump pump and drive it off my crank like option “c” above. For a single stage pump it will cost @ $200.

If I go the cam driven route, it will be the most costly option at close to $1k for the pump and machining. Does anyone see a problem with driving a dry sump or VW pump via the crank?

724doorE · 05-27-2003, 03:39 PM

There is an article in Excellence for a guy with a white 914-6 twin turbo using twin vw oil pumps driveen off his cam shafts. I think he had an early engine, was making 500hp from a 2.2 or sun\me such number. I gues it wouldnt look so great.

Another option might be to take a look at a local salvage at some modern turbo cars( cheap ones) simply for ideas on the scavenge theme.

I'm dying to know what you try and how it works.

dean · 05-27-2003, 03:55 PM

I thought I heard cam machining was $160 or so.

turbo6bar · 05-27-2003, 05:15 PM

Mark, one of the tuner guys (Callaway or one of the Mustang tuners) sells a turbo oiling system that is separate from your engine oiling. It has an electric Tilton differential pump. Wish I could find the url. That might be another option, if you are not averse to an electric pump.

Jurgen

724doorE · 05-27-2003, 06:56 PM

Jurgen, I like that idea.

Too bad you can't really run a turbo with the water cooled bearings( and oil cooled obviously).

Whats the difference in life expectancy between the two types of turbos all other system constraints being equal?

Mark, Whats your hp goal with this setup?

Will the intercoolers be in the back fender wells or over the top of the engine?

turbo6bar · 05-27-2003, 07:34 PM

Here's the oil system I referred to earlier:
Self contained oiling system by GranatelliMotorsports

I thought it was a Tilton differential pump, but low and behold, this is just a fuel pump. I think the reason they can get away with using a fuel pump is because they call for 5w20 or 5w30 weight oil, which is not going to be too viscous when cold, and will thin a lot after the turbo heats the oil. Granatelli wants $1200. I bet a guy like Mark can replicate it for $250.

Good luck,
Jurgen

Natchamp · 05-27-2003, 09:41 PM

Thanks to all. I will keep you posted on what I end up doing.

Dennis, my HP guestimate is @ 500+ depending on how much boost I run. The IC's will be on top of the motor. I think I'm going to switch to a 993 TT wing to enable fitment of a large one.

cheers.