New 2.8 Liter Six for the Racecar, I'll be asking a bunch of Conversion Questions Options

[motorvated]

The first question I have is related to modifications to the engine shelf pieces required for the 6-cylinder conversion. I noticed the Patrick Motorsports sells an expensive engine shelf kit for the 6-cylinder conversion. But, since the 6-cylinder is going into a Racecar, can I just cut out the entire engine shelf to maximize the available space in the engine compartment? Or, has anyone made a template that can be used to modify the 4-cylinder engine shelf to accommodate the 911 engines? I'd like just to remove the shelf parts if they are not needed. Thoughts on this? How do you other racers handle this. Many more questions to follow. I know there are many conversion threads out there, but it's hard to weed through them to see if they address the question(s) that I have. Plus most of Tigre are for street car conversions, not race cars.

Mike S.

[brant]

I dump my 2 front coolers through the wheel wells also
I wondered in the beginning if it would impact brake temps...


my mechanic told me no...
said that 200 degree air from the cooler was not going to hurt 600 degree brake temps...

turns out he was correct.
I've never had brake temp problems.
in fact if anything I have too low of a brake temp problem

I started measuring my rotors temps..
had to remove all of my brake cooling to get them to come up to a higher temp... operating range...

in fact had to lower my pad compound to a lower operating range just to get the temps up

had to lower 2 designations on pad material as the first step still didn't bring my brake temps into operating range....

so at least on my car... getting enough temp into the brakes was my problem and not overheating them....

I know I'm running a smaller motor (2.0) than a lot of others do...
I realize that with a much bigger motor, my top speeds would increase that that would also bring my brake temperatures up...

but at least in my application, the oil cooling air... does not negatively impact brake temps

[motorvated]

I dump my 2 front coolers through the wheel wells also
I wondered in the beginning if it would impact brake temps...


my mechanic told me no...
said that 200 degree air from the cooler was not going to hurt 600 degree brake temps...

turns out he was correct.
I've never had brake temp problems.
in fact if anything I have too low of a brake temp problem

I started measuring my rotors temps..
had to remove all of my brake cooling to get them to come up to a higher temp... operating range...

in fact had to lower my pad compound to a lower operating range just to get the temps up

had to lower 2 designations on pad material as the first step still didn't bring my brake temps into operating range....

so at least on my car... getting enough temp into the brakes was my problem and not overheating them....

I know I'm running ma smaller motor (2.0) than a lot of others do...
I realize that with a much bigger motor, my top speeds would increase that that would also bring my brake temperatures up...

but at least in my application, the oil cooling air... does not negatively impact brake temps

Ok next question. The 915 transaxle that was in the prior 914 was equipped with an external Tilton pump and cooler with fan. Unfortunately that cooler remained in the car and I only have the AN fittings remaining on the case. So I need to reconstruct a cooling system for this transaxle. I am thinking that I can use the same type of Tilton positive displacement pump that was used in the prior system. I would like to use one of the Summit racing aluminum "heat sink" dual pass coolers with no fan for cooling as it keeps things simple and the cooler is more compact and more robust than a finned cooler. The heat sink cooler should do the job as long as air is flowing over it, and since the transaxle only gets hot when the car is moving at speed, air will be flowing. I really shouldn't need a fan for when the car is not moving, and the heat sink cooler still removes some heat in stagnant air conditions, although the rate of heat transfer will be much slower.

Is anyone using a "dual pass heat sink" type cooler with no fan for their transaxle, and if so is it doing the job? Summit Racing has them but they do not have a Btu heat transfer rating for them, so it's kind of a crap shoot as yo how well they will work.