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Currently, diesel engine pistons are typically made of steel - aluminum was used previously, as it had better heat sink properties, but Metallurgy has improved steel enough to the point where it holds up fine now. The highest ring on current production diesel engines is at the top of the piston now - this was in response to emissions requirement. Gas engine pistons are flat at the top, as it is a spark which ignites the fuel/air mixture; diesel engine pistons often have the 'Mexican hat' at the top of the piston, as they ignite through compression.

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Q: What is the difference in a diesel engine piston and a gas engine piston?
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