Abstract: An air flow controller and heater for use in preheating intake air being introduced into the carburetor of an internal combustion engine wherein the intake air is directed by fixed vanes or air flow guides into a spiral and therefore elongated flow path about an electrical heating element which is oriented downstream of the vanes or guides and along the air intake nozzle of an air filter housing which is mounted over the carburetor inlet.

Abstract: A method and apparatus for supplying a liquid-vapor fuel mixture to internal combustion engines which includes a first conventional petroleum fuel supply and a second vapor fuel supply consisting of combustible vapors which are obtained from a heated fermentation reservoir carried by a motor vehicle and in which combustible vapors are produced and wherein the first and second fuel supplies are selectively mixed before becoming introduced into the internal combustion engine which powers the motor vehicle.