Posted by MarkB_MI on July 21, 2008 at 16:15:32 from (216.234.126.126):
In Reply to: copper cylinder heads? posted by Nikolas Britton on July 21, 2008 at 00:50:20:
They don't make cylinder heads out of copper for the same reasons they don't make them out of gold: Too heavy, too soft and too expensive.
A friend of mine is an engine block engineer. He says that cast iron is as close as you're going to get to an ideal material for engine blocks and heads: Tough, inexpensive, easily milled, good thermal properties (including minimal expansion). But it's heavy, which is why pretty much all new automotive engine designs are aluminum. And aluminum is used in spite of its thermal properties rather than because of them.
Actually there are some alloys of copper (such as manganese bronze) that I'm sure you could make an engine from. But you never see it, even in marine applications; bronze is way too expensive and heavy for most applications.
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