Abstract: An engine control system is provided with a memory having an area addressed by two parameters chosen out of a group of throttle valve position, manifold pressure and engine rotation number, memorizing digital forms of predetermined fuel injection quantities plotted at points separated with a given distance. The values stored in those areas are read out to give a digital form of fuel injection quantity addressed with said parameters introduced by the sensors during the engine operation. The read-out value is multiplied by a coefficient concerning at least one of such detected values as air pressure, aspirated air temperature and engine temperature in order to give a corrected quantity with which the fuel injection is controlled. In this invention the digital controlling quantities stored in the first memory are plotted with short interval and high accuracy where the throttle opening angle is small and the interval is increased with increasing throttle opening angle.

Abstract: An apparatus to control a liquid level in a carburetor with a fuel chamber formed in a main body of the carburetor. A level detecting element, i.e., thermistor, in the upper portion of the main body produces an electrical signal in response to liquid level, opens and closes an electromagnetic valve. Inflow of the fuel to the chamber is thereby controlled. A small chamber is formed in the fuel chamber by a partition for insertion of the detecting element.

Abstract: An exhaust manifold assembly for an internal combustion piston engine employs one exhaust tube for each cylinder and a collection chamber for each pair or larger group of exhaust tubes. Each collection chamber is connected to a plurality of exhaust tubes so that the exhaust timing spacing is the same in each collection chamber. A single exhaust reaction chamber is fed from pipes carrying the discharge from each collection chamber. The effect is to reduce backpressure and to improve scavenging efficiency while maintaining relatively high exhaust gas temperature for purification efficiency. The upstream end of each exhaust tube is supported and sealed within an engine exhaust port and the discharge end of each exhaust tube is slidably received within its collection chamber.

Abstract: An exhaust port liner for an internal combustion engine has an entrance opening at one side into which exhaust gases are directed by means of a cylindrical sleeve fixed relative to the exhaust valve seat. A portion of the poppet type exhaust valve extends through the sleeve and into the entrance opening. The liner is inserted into the exhaust port from the discharge end of the exhaust port. The liner is secured to the valve stem guide and is also supported near its discharge opening. The sleeve may be fixed to an insulating ring abutting the valve seat, or the sleeve may be threaded directly to the valve seat.