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Vapor carb was a spinoff of Smokey Yunick's 'hot vapor' engine. he used a 4cyl pontiac 'iron duke' to roll out of spark and run the engine basically off preignition. He nearly doubled the gas mileage and hp of a the little fiero he worked on, while driving completely normally. Dude was a genius.
Problem with the 'vapor carb' is most carbed intake manifolds and runners (or wet manifolds in general) are not ported, to help with atomization of gas/air charge. By the time the charge enters the combustion chamber, temps will atomize the charge regardless. Unless combined with a system that can take advantage of the lower autoignition temperature of the vapor charge (like yunick's fiero), it really won't make that much difference.
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