Complex question:complex answer. The hotter the engine runs, the higher the efficiency (pretty much all types of combustion engines) Efficiency leads to horsepower hours/ fuel. So for power per gallon, it is temperature. The hotter the combustion chamber, the less fuel is quenched at the colder walls and piston head. But if an assumption is made that the fuel detonates at a certain temperature, the surface temperature of the chamber is limited. Ceramic pistons and cylinders have been played with to stretch the envelope in this regard. The heat of combustion produces pressure that stays high if the engine surfaces do not cool it as it pushes the piston down. Or turbine around and around in a turbo (jet or gas turbine aircraft are in this category). Modern automobiles operate in the boiling range of pure water to raise fuel efficiency and emission reduction. Fuel air intake that is cool results in a denser charge, (more of it in the cylinder) Modern fuel injection atomizes the fuel far better than leaking it into a hot manifold (as with a carb) so cold air works to make a better charge. Intercooling supercharged air does this as well. The added density is worth the loss of Delta T in the chamber. Rumley, and other Distillate/Kero engines resorted to technical means to stay hot. Oil cooling, and shutters. Serious topic. Jim
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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