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Old 09-24-2014, 05:16 AM   #62 (permalink)
renault_megane_dci
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Join Date: Feb 2009
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la_voiture_de_courses - '03 Renault Megane Estate
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90 day: 44.34 mpg (US)

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What about using a length of copper tube wrapped around the exhaust ?
Then you get free heat back and you can direct it into the engine and trans.

Of course you have to thermostat it for when you hit peak temp on longer trips.

This is only suitable for older vehicle without a cat' obviously.

Also it would call for a a oil to water heat exchanger somewhere wich would be the real killer engineering wise ...
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