Mocal vs Tilton oils cooler pumps, One better than the other? Options

[pcar916]

I'm adding a cooler and pump to my transmission. These two pumps are similar in specification and both companies have been around a long time.

Tilton: http://www.summitracing.com/parts/TIL-40-524/

Mocal: http://www.racerpartswholesale.com/product...ial_Cooler_Pump

I know several of you run Jabsco Water Puppy pumps, but I see no advantage to it over the Mocal or Tilton.

Anyone out there with experience as to whether one is more reliable than the other?

[pcar916]

Excellent discussion and why I like this forum. I've decided the electric pump separate from the cam is the way to go. Not just because of the inertial issues, and those static cooling and draining advantages, but also ease of installation. Those PBase 914-6 galleries are superb.

The 993 PS pump pulley is attached to the cyl # 4,5,6 cam, not the cyl #1,2,3 bank like the Sporto pump. The PS pump itself is attached high, where our trunk bulkhead sheet metal is. On the 993 engine there is a sensor (cam position perhaps... too crunched to cruise my 993 manual this morning) where the Sporto pump would be.





Anyway, that's more fabrication than I want to attack since the electric alternative is so much faster to implement. Frankly, I love design and fabrication. But driving a good car that you've built yourself is the bomb!

Cooler mounting position:
I mounted my 2nd engine oil cooler (off of the sandwich adapter in the picture) behind the transmission. I initially mounted a fan but never had to turn it on, so I removed it. For this trans cooler addition, I'm considering a "cooler-sandwich" in the same position with both engine and trans coolers and a spacer in between them. The downside is that if I back into gravel I could get cooler damage and the day would be done, although I did it once at Texas Motorspeedway with no damage... I'm still embarrassed about that one...

A fan might be needed then... don't know yet until I can record some temps. I like ambient cooling if it's enough, since the power requirements are restricted to the pump(s).

John suggested mounting it high, like on the floor of the trunk with air ducted into it. That would be easier for certain, both for access and drainage. I'd lose some trunk space but perhaps not so much!

Links to engineering data:
I've not found a lot of empirical data out there in racing circles, and the folks who develop and package their cooling systems aren't motivated to share the data either. I like to think of it as a simple heat exchanger problem where I know the input heat and design enough cooling to bring the oil back to a desired temperature before returning it to the transaxle.

- This is about coil droplet size and cooling efficiency. The summary is likely sufficient for our purposes here, Makes sense... surface area is key in heat transfer, but the math is there if you're interested.

http://www.sciencedirect.com/science?_ob=A...1a181157c75e5be

Not on this specific subject but a lot on transaxles... The mid-engine crowd loves our Porsche 930 & G50s, inverted or not.

There is a lot of fabrication and neat stuff in the GT-40 world. i.e.

http://www.gt40s.com/