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Good information from Bill as usual.
I will offer one subtlety regarding the cooler return oil into the leading edge of the CWP mesh area. The highest temp is immediately after the mesh on both parts, also the introduction of excess oil as the gears lead into mesh can create very high hydraulic forces, enough to reduce the life of the gears, cause surface errosion. Cool oil would be best added to the trailing side as the gears come out of mesh.
As Bill says the "Virtual Hurricane" or as I put it in my favorite term "a whirling dervish of oil mousse" kind of defeats any real effort to have an effective oil spray bar system. I used a new analogy in a discussion the other day - "like trying to piss down the drain hole while your standing under the shower." It is unlikely that the oil from a spray bar nozzle makes it to the intended target. Unlike the piston oil squirters in a 911 motor, that operate in a relatively oil free environment inside the dry sump crankcase of the motor.
However the spray bar is a good way to fully distribute cool oil to many locations - think of it more as a multi location distribution manifold, rather than a discreet oil squirting device.
In terms of the black fitting on the transmission on the photo, I suspect that is a custom made oil return fitting. To return in that position is probably intended to socket directly onto a spray bar system, as that is where the spray bar will make contact with the front cover, if that axis is extended.
On of our current 2005 projects is a 915 cooling system. It will be somewhat modular and fill as many 915 cooling requirements as possible, including a no-disassembly-required kit, that will allow a 915 cooler system to be installed with the transmission in the car. No cutting, drilling tapping or welding required.
One of the flexible options incorperated is to have a spray bar option - also installed without disassembly of the transmission - just the front cover. To do this we had to come up with a machining operation to provide the port and bolt pattern for the oil supply to the spray bar. It looks similar to the black fitting in the photo.
Jerry Woods and I compared notes and agreed on what we will share as a universal port location, size and hole pattern.
It seems that the more 3.6l/915 transplant cars built, the more demand there is for 915 cooling systems. A system like Thom's is very effective and depending on what stage of your project you are at (transmission disassembled??) probably the most straight forwards option.
Regards
Hayden
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