overheating

[Bubstr]

I guess there is always more than one way to skin a cat, but the guy that said heat exchange is the key is close. Looking at the Physics of the problem, the weak link is exchanging from water to air in the radiator. Lots of air threw the radiator is what's needed. Too fat a radiator can slow it. A big fan can help on low speeds but hurt by blocking air at high speeds. Close fins in the radiator clog with dirt faster and restrict air flow. Too far apart and you lose surface area.

As with most race car stuff, there is a balance or compromise. The high Pitch 4 blade fan works, because it pushes air threw the radiator at low speeds but does not restrict the air flow at high speeds. The 2 pass radiator works better than a 4 pass because it don't clog as easy and offers less restriction. Anything you can do to get air threw radiator rather than around it helps too.

[oldtrackchamp4x]

Got a buddy i race with that had identical problem. All he did was build a shroud and his temp dropped an honest 30 deg. Make sure when you build shroud it is sealed around rad, and the most important thing is that half the end of the fan blade is inside the shroud and the other half is outside the shroud. JMO