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Smokey Yunick, one of the smarter mechanics in Daytona and Detroit, put a lot of time into an engine that even used preheated air to aid vaporization. It had a turbo, to help make up for the loss of density, but he called it the "homogenizer" for its role in mixing the mix. AFAIR, he got his intake temperature up to 400F with no problems over pre-ignition. Popular Science ran an article on a 150HP 2-cyl engine he was using in a test mule. This was separate from his adiabatic work.
The "Carburetor Heat" control is a standard safety precaution against carburetor icing on aircraft, and can definitely be noticed working some days. I wonder why icing is so seldom recognized in automobiles.
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