I've seen rear mounted radiators before on Rods I don't know how well they work at speed, but they seem to work when puttering around town. And since most of these are running blown big block engines you'd think there'd be enough flow to handle our little engines.
Are you going to put your beastie on the track? A relatively minor rear end tap could put you out of commission as there is no crumple area between the rad and another car like there is in the front.
As far as running coolant thru chassis tubes keep in mind you could get corrosion and eventually failure of the tubes. Not a pretty sight. Also there is the heat transfer.
While that might be good for the coolant I am not sure it would for you or cockpit temps.
How bout side pods for the radiator and shape the pods to smooth out the airflow over the rear wheels? Protection, less plumbing and better weight distribution.
Good points. I did think about corrosion and heat transfer issues. I think with the proper coolant/corrosion inhibitors, that should not be a problem.
Heat transfer can be dealt with with a little insulation. This is the reason I chose the bottom tubes and not the top so my arm won't be resting on a hot tube.
I believe, but I'm not sure, that there is enough pressure differential between the bottom of the car and the back of the car to get good enough airflow at speed without
scoops. As far as rear end collisions are concerned, yes that would be a problem, however, I don't intend to race this car although I probably will take it on the track from time to time.