I would have thought that a larger air cooled radiator would have been the go. The problem, like you said, with the inline cooler is that altough it is simple, you are going to have trouble with heat sink... I am tempted to bypass the radiator all together and go air cooled with something like the RX7 cooler. These are huge and there are plenty around. The other benefit with this system is that the radiator get back to what it does best and just cool the coolant. Constant oil temps shouldnt be to much of an issue due to the thermostat in the oil system. But having not done this conversion I cant offer any real data...
Are you talking trans oil or engine oil?
Both have an optimal temp. Over and it's bad for the oil under shouldn't matter to much in Australian temps unless you are in the snow fields even then I wouldn't think it to bad, especially if you have a oil to coolant unit in the system to warm the oil when needed.
I have been thinking of replacing my transmission lines for some of those inlines oil coolers, thinking that coupled with the oil to coolant unit in the system it might also suck a little extra out of the whole system.
But I already have a monster transmission cooler and as stated the oil to coolant unit to.
I had a brand new old RR porcupine type cooler so I cut the "loop" end of the metail pipe cooling pipee on the TD5 and ran an out line to the Porcupine cooler and back to the return line.
The porcupine cooler fitted nicely under the intercooler and cleared the radiator. Seems to work well.
One question on the first cooler listed. How does it mount? Also what are the end fittings? If they are JIC/AN (37deg taper/unf thread) and it's fitted on hose then if the hose is clamped the cooler will be swinging of the hoses, but will effect the connections less. If mounted on hard lines will be better supported but will leak at the connections.
I'd hit ebay and look for a good setrab cooler or go to the wreckers and find a saab with a cooler on it (made by setrab) they will have moubting tabs. Also the bar/plate design over the tube fin as pictured is far better for heat dissipation.
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