bgreene

Has anyone out there seen/heard any rumors about a MT cooler compatible with the 8?

Is such a thing even possible? (can convection-driven flow happen at the viscosity of that fluid? Otherwise would the weight and hassle of another pump make the whole exercise a waste of time?)

Would there be any noticeable or significant benefit to using such a device, or are gear oils (I'm swapping out with RL-MT90 as soon as I can get fill/drain gaskets) good enough for the heat in this gearbox?


I'm just kind of curious 'cause I can remember how hot my console used to get in traffic back before getting the damper insulation TSB dealt with, and I'm guessing the heat's still down there, just the added insulation keeps more out of the cabin.... (or is that heat coming from the cat rather than the tranny?)

Doctorr

First, let me assure you that the gearbox aluminum construction is already a very effective heat transfer medium, and the structural reinforcing ribs on it also help. The box is somewhat isolated from the heat of the engine by the clutch housing, and runs fairly cool because it is WAY more efficient than an auto.

Second, you are probably right that convective flow of a liquid that viscous is going to be minimal.

However, the real reason to stay away from an external cooler is the huge liability it presents - the cooler and piping could get snagged, corrode, or be mechanically damaged, leading to fluid loss and gear damage.

There is no level indication, so fluid loss would ALWAYS result in destruction. Your first indication would be noise or inability to change gear, and by then it is too late.

A good quality synthetic fluid will give less friction, and run cooler, with the side benefit of smoother shifts. Your choice of 'Redline MT90' is a good one. (Stick with an oil that is GL-4 rated.)
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doc

w2aew

Two quick things:
- There is no pump to move the oil around in a manual tranny, so no way of moving it though a cooler. A good quality lubricant is all you need.
- The heat in the console is from the exhaust system, not the tranny.

bgreene

Thanks guys