Transaxle oil cooler pumps Options

[pcar916]

How many of you are using gear pumps instead of diaphragm types and what filter element (micron) sizes are you using?

[ottox914]

The location of the pump will make a difference. Gear drive pumps, like these: http://www.rbracing-rsr.com/oilsystems.htm need a gravity feed- they won't "pull" oil if the pump is located above the lowest point of the oil feed. The tildon style can be mounted above the trans if needed.

I switched from the tildon style to the RB gear pump for the scavenge pump on the turbo 914. Don't know if the tildon was bad or not, but liked the idea of the smaller and more powerful gear drive to be SURE there was no oil backing up into the turbo, as with the low mount of the turbo, there is no roof for a sump.

Just something to think about in the trans application.

[pcar916]

Gear drive pumps... need a gravity feed- they won't "pull" oil if the pump is located above the lowest point of the oil feed.

Now that's interesting. I thought all external-gear pd pumps were self priming (by definition) up to varying heights depending on the pump design. My check valve on the pump outlet will keep oil in the circuit anyway unless it leaks down but by this example since I'm pulling the oil out of the drain plug, I'd have to install the pump down at that level. Am I understanding you right?