As long as it is a closed system, pressure should not be an issue. I have seenpeople put coolers on their Baja Bugs on top, or on th e side of the busses. One installation I saw suggested mounting it on the bottom of the rear luggage compartment, above the transmission. You will want to have some sort of thermostatic switch, to help with warm up, and probably mount some sort of electric fan to give some air flow when not moving
As stated above, it's best to use a cooler with a full flow setup. Other methods either don't route all of the oil out of the case or may have some inherant pressure issues on their own. My setup has maybe 10'-11' of oil line in all for both a filter and a cooler. Pressure loss with all that isn't worth worrying about, it's next to nothing. Avoid 90 degree fittings (the kind that make a sharp turn) at all cost to prevent pressure loss. Either run 6" more line to make the turn, or use a 90 degree fitting that is a radiused piece of tubing.
My setup uses a fan mounted on the cooler and the whole assembly is tucked up under the package tray just above the tranny. An electrical thermostat is needed to turn the fan on only when needed. This is in addition to a mechanical thermostat to bypass the cooler alltogether when the oil is still cool.
On top of all that, a temp gauge is really a good idea to be sure that you're oil is getting up to temp, cool oil is bad too. --Ryan
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