Quote from Georgia Fiero Club webpage titled "Driving the Smokey Yunick Hot Vapor Fiero by Eric Schneck
" Smokey’s system created roughly 1.8 hp per cubic inch, and could be applied to virtually any Otto-cycle (standard 4 stroke) engine. Using this formula, it is quite possible to create big block 454 engines getting 817hp. In every case the horsepower was created at 5200 rpm, which makes for a very streetable engine! So now you have some background on the theory of the engine, but what about the components themselves? The engine runs a basic carburetor, sitting on what Smokey calls a “first stage vapor generator”. Hot water exiting from the engine runs through tubes in this vapor generator and heats the fuel mixture to around 200 degrees. The fuel mixture is then passed through what looks like a stock turbo, however it is not a turbocharged engine. The turbo-like device is actually a homogenizer and the second-stage vapor generator. Exhaust gases surround a turbine, through which the incoming air and fuel are mixed. This mixture is again heated, bringing it to approximately 285 degrees. From there the mixture travels into a custom intake manifold that is surrounded by exhaust gasses, which again heats the mixture to the desired 400~440 degrees. It is at that temperature that the fuel is fully vaporized. As Hot Rod wrote, “The beauty of Smokey’s system is its simplicity, but simplicity is deceptive. Staged heating or the working fluid (air/fuel mixture), homogenization of the working fluid at the proper point in the heating process, and balanced heat management are the keys. Get one thing wrong and the whole thing won’t work. There’s a lot of physics and chemistry involved, and a few of the details contained in the various patents on this design have been intentionally withheld by the Smoke, although the basic principle of operation has been explained here. "
Georgia Fiero Club Official Website
Just rediscovered this. I think, it explains his ( Smokey ) basic idea.