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"One backfire through the carburetor could conceivably explode the front end off the car."
Do you also feel that natural-gas-fueled domestic stoves are similarly likely to explode home kitchens? After all, as you must know if you've ever bothered to study how these external gasification systems are configured, they generate pure gaseous fuel which is NOT premixed with oxygen any more than Compressed Natural Gas or externally-vaporized Liquid Petroleum gas fueling systems are premixed with oxygen.
Some early exhaust-heated gasoline vaporizing promoters made silly unsupportable claims. But their silliness does not justify piling on with unfair and unsupportable suppostional attacks.
Partial fumigation with either Compressed Natural Gas feeds or LPG gas feeds quickens post-ignition combustion development and quickens combustion completion. The faster flame propagation speed enabled by partial fumigation generates higher average piston pressure through the decompression power stroke even when total fuel BTUs are the same. So why would partial fumigation with vaporized gasoline not also quicken combustion? Liquid gasoline droplets CAN NOT burn. Only after their delayed evaporation and subsequent mixing with oxygen can fuel delivered as liquid droplets burn and start developing piston pressure. These exhaust-system-heated vaporization systems eliminate those droplet phase-changing delays within combustion chambers.
It's way too easy to take pot shots at this design strategy based on some obviously silly claims. It would not surprise me at all if well-configured exhaust-heated gasoline-to-gas generators can improve typical highway cruising MPG compared to typical fuel injection systems. Only if actual testing by at least a dozen well-experienced fueling system innovators produces no examples where these systems fail to improve MPG can justify dismissing these systems.
Let them stand or fall on their own merits. Piling on dismissive comments based on poorly-considered speculations and decades-old silly advertising exaggerations is also unjustified.
Just my opinions.
John
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