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This, of course,
assumes that you have the same incoming air temp to both. Putting the oil
cooler behind the radiator throws a big wrench into optimizing the cooling
systems; and is a bad idea from the git-go. Heat rejected is pretty much
proportional to the temp difference between the air and the coolant/or oil. But
if that’s your only configuration option, and the air temp increase through the
rad is, say, 35F; and you want to climb out on a 90F day, you can expect to need
an oil cooler core volume of roughly 1 ½ times normal; or about ¾ the size of
the rad.
This is rough
estimating and assumes equal effectiveness of rad and cooler; but you get the
idea.
Al
Thanks for the
info Al. I spent some time considering moving the oil cooler to the right
cheek, but that causes me more problems than it solves. Since the oil
cooler will likely be putting out less heat than the radiator, it would
seem to make better sense to have the oil cooler in front of the radiator,
rather than the way I have it now. That's easy enough to do in
the rev 2 configuration, and it's about test #3 on the list now. I
can do it quick and ugly with my current hoses, though I'll receive more abuse
from the natives since it will require that I route the hoses briefly
outside the cowl to get around the side of the radiator.
Say what you want about my BUC, but I'm actually glad that I
didn't try to make a final cowl in the beginning. I've been able to do experiments with BUC that I
would have never done with a "pretty" cowl.
Cheers,
Rusty
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