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?

[pcar916]

Gosh, I just typed in responses for the last 30 minutes and the battery went dead so they're gone. Thanks for the responses and I'll get back to this later today after tending to some urgent stuff. In short...

3.6L /w short-geared 914. I'm building up a 915 soon that will use the same cooling system.

1. Temps about 210 and higher in southern summers and aggressive hours through the Arkansas hills and on the track
2. Want to filter out particulates (Clutch LSD)
3. Increased fluid capacity (longer fluid life)

I think Weldon is a vaned pump. Very nice but more than I want to spend since a helical spur-gear will work just fine for $275 instead of nearly $600.

Weldon uses 100 micron, RBRacing uses 90. I've spoken to them and the Mocal 240 micron filter will be fine for a transaxle system. I'm not cooling turbocharger bearings here. More later...

[stewteral]

Gosh, I just typed in responses for the last 30 minutes and the battery went dead so they're gone. Thanks for the responses and I'll get back to this later today after tending to some urgent stuff. In short...

3.6L /w short-geared 914. I'm building up a 915 soon that will use the same cooling system.

1. Temps about 210 and higher in southern summers and aggressive hours through the Arkansas hills and on the track
2. Want to filter out particulates (Clutch LSD)
3. Increased fluid capacity (longer fluid life)

I think Weldon is a vaned pump. Very nice but more than I want to spend since a helical spur-gear will work just fine for $275 instead of nearly $600.

Weldon uses 100 micron, RBRacing uses 90. I've spoken to them and the Mocal 240 micron filter will be fine for a transaxle system. I'm not cooling turbocharger bearings here. More later...

Hey pcar916,

OK, then... you really know what's involved with your application! It seems that the oil temp is not the real issue, but keeping the oil clean is: Very Smart.

I went with a TORSEN diff in my 930 just to avoid the clutch plates in a limited slip diff. While the LSD is a better diff, those plates wear all the time and require radjusting & eplacement. I experienced this years ago with a Datsun 510 I raced with an LSD diff.

210 Deg in Southern Heat seems like NO Problem to me as conventional oil doesn't really start breaking down until above 250 Degand synthetics go much higher.

Since your goal is actually circulating and cleaning, may I suggest again the low-cost approach I used with the power steering pump? I think I paid $30 for it and $25 for the small oil cooler. Make your own "Aeroquip" lines and you're set!

Question: I have have heard a general belief that the 915 is not much, if any, stronger than the 901. Is this another erroneous "Legend?"

Best,
Terry