Originally Posted by
MATHO
a lot ofArabs use not active cooled engines for their dune drag racing cars (outsidetemps around 40°C = 104°F) but they use alcohol instead of gas.
They firethe engine, let it run a few seconds and then the car runs up a dune hill anddownwards. Or they are running at sand beaches.
Alcohol(methanol) has a self cooling effect that means, that this medium will cool theengine due to evaporation cooling.
We haveprepared a few engines for that purpose w/o active cooling, we took air cooledcylinders but w/o fans.
I have seenin the web that a few US modelers took boat motors, put aircooled top ends onthose and were
runningwith success. But I do not know whether alcohol or gas.
If you’duse boat cooling cylinders and put water into the cooling heads, the water willbecome steam and will be blown out, this will work also,
the headswill stay at 100°C (=212°F) until the water / steam is blown out.
But: if youdo not use distillated water the inside of the cooling area will be filled withthe remaining particles of the water, for example chalk / limescale and thiswill lead to a worse cooling efficiency
................................Thanks MATHO your suggestions and comments were very helpful.