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I've thought about it over the years, Obviously some of the gains were from greater heat retention when not running, faster warm ups. I remember being thrilled that I could now get hot air blowing from the heater less than 1 mile from home, instead of 5-6 miles.
I disagree that automotive engineers would be looking at this, I have known too many in my time. Offhand I can think of a dozen examples of automotive engineers ignoring existing engineering solutions.
Still, I urge read thru all the info out there on Adiabatic Engine efficiency. I makes sense, if you think about retaining more engine heat - The more heat you can retain, the higher your efficiency.
Smoky demonstrated conclusively the advantages.
I would love to find someone else who has experimented with this. Mine was a diesel IDI engine, Smoky was successful w gasoline engines.
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