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Charlie,

I suggest you look also into exhaust augmentation.
If you are already "skunk working" on something new and exhaust related, you
might as well reap the benefits from that. It should help with cooling
(pulls air through the radiators/oil cooler), it would provide some kind of
fairing (streamlines the cooling exit, exhaust exit and might hide any
muffler), it also should muffle the exhaust noise (might get away with out
any muffler...). As the augmentation implies a mixing with cooler (...than
exhaust) air this should muffle the noise as well. If it does not mix, it
will at least suround the hot exhaust gases with a mantle of cooler air -
muffling again. It should also increase efficiency as you have the exhaust
gases do some work - should also work for a turbo (double duty!)
Last but not least benefit: Depending on the exhaust routing ( how early in
the duct you can introduce the exhaust pipe into the cooling duct), the
cooler air in the duct will isolate the exhaust heat from the rest of the
engine compartement.

Just a little info from this site: http://bd-4.org/cooling_nicoson.html
Dan Nicoson is planning a V8 installation with exhaust augmentation, so it
is also liquid cooled and a lot of heat to be removed.......

Anyway, I hope between all on this list the maximum power, lightest weight,
most reliable system is found some time, so I can shamelessly copy the
perfect setup!! - ...sometime when I get to build:))

Cheers,
Thomas Jakits