Abstract: A flow system for an internal combustion engine has a first conduit connected to a water reservoir and extending therefrom to pass adjacent a heating source such as the exhaust pipe of an automobile engine, and then passes to connection with the bore of an adapter plate beneath the throttle plate of a carburetor. A second conduit extends adjacent the exhaust pipe to be heated so that air from the atmosphere can pass through it to the carburetor and intake manifold. A third conduit connects the first and second conduit, and a fourth conduit connects the third and first conduit. The first, second and fourth conduits have flow control spiral orifice pieces which restrict the flow of fluid.