Abstract: A multiple valve engine and more particularly an improved combustion chamber and valve arrangement for such an engine that permits high compression ratios, good breathing and a smooth combustion chamber. There are provided three intake valves and two exhaust valves. The center intake valve is supported so that it reciprocates about an axis that lies in a plane containing the cylinder bore axis. The other valves are all inclined to each other so that adjacent edges between the valves will all lie in a common plane that extends perpendicularly to the cylinder bore axis to provide a smooth combustion chamber configuration. In addition, tapered cam lobes on the camshafts operate the angularly disposed valves. These tapered cam lobes have heel diameters that are larger than the adjacent bearing surfaces of the cams so that the cam lobes may be conveniently formed by grinding without damaging the bearing surfaces.

Abstract: A cylinder head and valve train mechanism for an internal combustion engine having six valves per cylinder. There are provided four intake valves and two exhaust valves. In some embodiments, the size of the intake valves is varied because they are served by a common port so as to insure equal flow to the cylinder through all valves. In one embodiment, a single insert forms two of the valve seats. Also, two of the four valves are disposed at acute angles to both a plane containing the cylinder bore axis and a perpendicular plane passing through this axis in many embodiments. In these embodiments, the cam lobes that operate the angularly disposed valves have cam surfaces that are inclined relative to the axis of rotation of the camshaft. In some embodiments, all of the intake valves are operated by a single camshaft. In other embodiments, two camshafts operate different pairs of the intake valves. Various bearing arrangements for the camshafts are illustrated and described.

Abstract: An improved two-barrel, multi-fuel carburetor. The carburetor comprises a main body portion in which the main fuel bowl is positioned and an auxiliary body portion in which an auxiliary fuel bowl is positioned. All of the fuel and air passages extending between the main and auxiliary body portions extend through faces of the respective body portions that are in facing engagement when the auxiliary body portion is affixed to the main body portion so as to eliminate the necessity for external plumbing. Also, an improved arrangement is provided for preventing the discharge of fuel from the auxiliary fuel discharge under some engine running conditions. The carburetor also employs a simplified accelerating pump discharge that uses only a single accelerating pump discharge tube that extends completely through one of the induction passages and which terminates in the other induction passage and has discharge ports in both induction passages.