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Didn't Jim Fueling or Smokey Yunick do some research on this back in the 1970's? Seems I saw pictures of a Vega or Pinto engine bay...
If I remember correctly, the article stated you need some pretty high temps, well over coolant temps of +200F, to realize any significant gains. Just repeating what I read, I'm pretty sure the system used exhaust manifold heat and a heat exchanger. Super-heated fuel sounds tough to manage, from a saftey perspective. But then again, so does internal combustion when compared to an 1600's cooking fire or 1800's steam boiler.
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