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thermophilic Diesel
Diesels appear to like heat very much.
A fella in Germany did a special Diesel engine which was tested in AUDIs and VWs.
It had no conventional cooling system but rather was oil-cooled and used a heater core for a 'radiator' and only when 'necessary.'
It wasn't supposed to be adiabatic or in defiance of physics,but was extracting a lot of work from the fuel and swirl in the combustion chambers helped isolate hot spots from critical metallurgy.
Very tasty mpg.
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