transmission oiling and cooling, Once again, my approximation Options

[michel richard]

I will be putting significant power through my 901 transmission, with the new engine I am having built (2.5 short stroke twin plug six) and I figured it might be beneficial and fun to build a cooling and oiling system for the tranny.
The factory did it on some racing cars, both 911 and 914. There are pictures on the thread below.

http://www.pbase.com/9146gt/porsche_gearbo...lubrication_kit

As usual, I don't want to go whole hog and through the trouble of sourcing factory parts, so I will machine a system to approximate what the factory did.

This is testing the limits of my abilities, though, and there is no guarantee that I will end up with a system that is good enough to install on my car.

Still, here it goes.

I was looking for a sportomatic oil pump, and Mark Garcia found one in his stash. He was kind enough to send it to me. Here's a thread with those details.

http://www.914world.com/bbs2/index.php?act=...&hl=sporto+pump

The next part I chose to tackle is the tranny drain. Here's what it's supposed to look like:

http://www.pbase.com/9146gt/image/39330791

After much thinking and experimenting, here's what I've come up with (the part is not completed, this is what I've done so far) :

[john rogers]

The system looks good so far. I started running a trans pump and cooler when we put in the higher revving six and I was told quite a few of the vintage 2L cars, both 911s and 914s have trans failures due to high heat and high RPMs. I used the "kit" that Jim Patrick sells and when the trans was out for refresh we added the spray nozzle over the R&P as you did and also one over the gear cluster. It was a bit tight to route the braided lines and AN fittings but they all fit. He also sells an aluminum bung that replaces the speedo drive so I hooked up a temp gauge and was surprised hot hot things got. I was going over 300 degrees in the Mexican road races where there was no long straights for extra cooling so I added an axial fan in the air supply line and temps stayed below 250 after that. I also switched the pump so I can let things start to warm up a little before I turn it on. For capacity, we are using just about a gallon of Swepco now.