Motoexotica is proud to offer a truly one of a kind automobile. It is a Smokey Yunick Research and Development Hot Vapor Fiero. Smokey spent decades working on the Hot Vapor Engine. It has been tested by many, including Hot Rod Magazine; it has been called a fake; it has been said that it doesn't exist and it has been called the solution to all of our high gas prices. You can do your own research on the Internet and in books and reach your own conclusions. The car is uneventful in its appearance. It's an early Fiero and white. You would walk by it in any parking lot or car show and not give it a second note. It is very clean with a terrific paint job and some strange tires but nothing to make you stop. Even with the engine bay exposed you know something is different, maybe a turbo, but nothing spectacular. Start it up and it sounds like a strong little four banger. There is way too much to this story to tell in even this extended coverage but I will try to give you an accurate overview as reported by Hot Rod in June of 1984 by C. J. Baker.As most of us believe making the fuel cold increases density and improves performance. Cooler air and cooler fuel means more air and more fuel into the combustion chamber; bigger bang. That's why our cars run so well in the spring and fall with that cool crisp air. Smokey went a different direction. He believed that the quality of the mixture was more important than the quantity. Most engines of the day burnt only 25% of the fuel and wasted 75%. Smokey's premise was, heat the fuel too 400-440 degrees and you could vaporize the gas more efficiently and obtain more power from less fuel. He designed a new cam; a homogenizer (exhaust driven turbine) to mix the air and fuel and a new intake manifold that is totally wrapped by exhaust gas ducting (to heat the mixture). The system is more complicated than my brief description but you can see in the diagram how it works. I have also included excerpts from the Hot Rod Magazine article as follows.The following are excerpts from the Hot Rod Article to further explain the technical details of Smokey's Hot Vapor Engine."...consider the Pontiac Fiero shown here. Equipped with Smokey's "expander-cycle" exhaust and induction system, and requiring only a cam change inside the production 151-cubic-inch (2.5 liter) Iron Duke 4-cylinder, the car now gets more than 50 miles to the gallon, develops 250 hp and 230 ft.-lbs. of torque, runs more smoothly than any 4-cylinder you've ever experienced, starts and idles smoothly and cleanly, has no computer controls, passes federal emissions standards, an oh yes, it'll accelerate from 0-60 mph in as little as 6 seconds flat! Here's how it works.""Some parts of gasoline vaporize very easily at low temperatures to help get a cold engine started. Other parts have a much higher boiling point to prevent the fuel from vaporizing in the fuel lines enroute to the engine. What this all comes down to is that in today's typical engines, only part of the fuel entering the combustion chambers is in a combustible state. To fully vaporize pump gasoline, and to keep it vaporized for complete combustion, the incoming air/fuel mixture needs to be elevated to between 400-440 degrees F.""First, all the hot water existing the engine is channeled through a heat exchanger directly under the carburetor (or throttle body injection, TBI, unit)." (Next the mixture flows through what looks like a small turbocharger, but this is not a turbocharged engine. The turbocharger-like device is actually a homogenizer and the second-stage vapor generator. In the homogenizer an exhaust-driven turbine drives what appears to be a rotary compressor totally wrapped with exhaust gas ducting. The homogenizer serves to mix the incoming air and fuel into one uniform, homogenous mixture with the surrounding exhaust gases further elevate the mixture temperature to about 285 degrees F. From there the mixture flows through an intake manifold that is totally wrapped by exhaust gas ducting, elevating the mixture temperature to the desired 400-440 degrees F in this third, final stage. The fuel is now fully vaporized and distributed uniformly in a truly homogenous mixture that will burn cleanly and evenly in the combustion chambers without detonation or severe pressure spikes in the cylinders.""...all traditional internal combustion engines are dealing with non-homogenous, incompletely vaporized mixtures today. It is also true that the heating of the incoming mixture reduces its density and causes it to expand. On a normally-aspirated engine, such expansion would just push right back out through the carburetor, but on Smokey's system the expansion is trapped in the induction system because the small turbocharger (homogenizer) serves as a one-way check valve. Consequently, with the expansion contained, the induction system becomes pressurized, providing high mixture density and artificially aspirating the engine."