Posted by david - or on July 21, 2008 at 05:00:04 from (143.182.124.4):
In Reply to: copper cylinder heads? posted by Nikolas Britton on July 21, 2008 at 00:50:20:
Highly thermally conductive cylinder heads and pistons are actually undesireable from a thermodynamic efficiency point of view. You want to keep the heat of combustion inside the cylinder where it promotes the expansion of gasses and production of useful work, not dump the heat into the water jacket where it represents energy wasted.
For this reason, there have been a number of experiments with ceramic pistons and even ceramic engines. There are still too many problems with manufacturability and durability, but these materials will be used one day.
Aluminum is sometimes chosen over cast iron for cylinder heads because it is light and saves weight, something important in cars (but not in tractors). Copper doesn't save weight over cast iron, making another strike against that choice.
Peltier cooling and vapor-cycle refrigeration are not used because efficiently removing large amounts of heat from the cylinder head and block is not a desireable end goal. The cooling system of an engine is a necessary evil, and needs to work just well enough to keep the engine from melting down. Circulating water (coolant) does this just fine.
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