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?

[naro914]

I hadn't heard that the Tilton had a 2 hour duty limit. Shouldn't be a problem, but I found that I HAVE to run the pump now...it seems that the trans fluid is bubbling up through the vent and into the trunk area (where my vent goes to) if I don't run the pump...

You technically overfill the transmission with fluid so you can fill the pump, lines and cooler...which all drain back into the case when not running. I'll probably move to Swepco or something synthetic once I know everything is working right...still dealing with an issue in the trans and had to take the engine out because of a BIG oil leak...

[pcar916]

I hadn't heard that the Tilton had a 2 hour duty limit.

...which all drain back into the case when not running.

The time limit was something a vendor told me and normally it wouldn't be a problem except in a street car during long trips. But he also said they were working on a constant-duty version of the same pump. Don't know how that turned out since I went with the gear pump which, in a perfect world won't take any maintenance. Considering we can hear our pumps so clearly I figure it won't be hard to hear when one of them fails! About the backflow, I did two things to make my system not dump much back into the case.

First there is a sensitive backflow valve at the pump inlet. RB Racing even has one that triggers at .5 lbs. Mine (Steuby Engineering) triggers at 1.2 lbs which is fine at it's height. The second is that my cooler is vertical, so it will never dump it's oil into the case. So far I have no pukeage at the vent, but I haven't done any track days either. I'll report back on that. I still haven't installed the overflow tank because the car is in the shop for bodywork and paint.