Painting aluminum with a black flat paint will change the emissivity and
help with convective heat transfer. High performance air-cooled engines
in aircraft and motorcycles have used this technique for many years to
achieve faster cooling rates. I've used this concept in designs for the
Navy in submarine weapons systems and at GE for numerous products. It's
also why my Norton and BSA jugs are painted black.
However, since radiation and convection account for only a minor part of
the heat dissipation system in a water-cooled engine, I would suspect
that painting the heads would have a barely measurable effect.
Bugz
drmayf wrote:
> <----- snip ------>
> All three are needed. Of course, when the horsepower is increased
> beyond that which the radiator can recover then the motor will run
hot.
> The radiator, via the thermostat is the controller of the heat in the
> engine. Take for example an engine run in very cold climates... they
> will hardly warm up because of the heat being carried away via
> convection and radiation. Needless to say, the system needs to be
> well designed to do the job at hand.
>
> mayf
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