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Old 10-06-2010, 02:10 PM   #22 (permalink)
jamesqf
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Quote:
Originally Posted by Old Mechanic View Post
Chiron Free Piston Engine

DOE papers 10 years ago stated 58%.
That Chiron Free-piston Engine is hardly a standard IC engine, you know :-) Indeed, at a quick glance it looks like a variation on a Stirling engine.

From Internal combustion engine - Wikipedia, the free encyclopedia

"Most steel engines have a thermodynamic limit of 37%. Even when aided with turbochargers and stock efficiency aids, most engines retain an average efficiency of about 18%-20%."
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