Abstract: An air intake assembly having a bypass and method of operating an engine are disclosed. The air intake assembly has a first opening having a throttle plate disposed in the opening and configured to control the passage of combustion gas through the opening. A second opening is vented to atmosphere and configured to pass combustion gas through the second opening.

Abstract: An apparatus and method for adjusting a throttle plate of a throttle assembly of an internal combustion engine is disclosed. A throttle linkage mechanically connects a throttle actuator to the throttle assembly with a deadband therebetween. The deadband allows the throttle plate to remain in a closed position during initial movement of the throttle actuator and initial acceleration, thereby reducing overall engine noise.

Abstract: A submersible outboard motor that can be stored at or deployed at a subsurface location. The outboard motor includes an internal combustion engine, such as a two-stroke engine, that is fuel-injected. The use of the fuel injection and the design of the engine permits the outboard motor to be started at a surface location once retrieved from its subsurface location.

Abstract: The present invention, in one aspect, is a cooling system for a marine engine and includes cylinder cooling jackets, cylinder head cooling jackets, and thermostatic and pressure controls which facilitate safely operating the engine with low water flow rates. In one specific embodiment, the cooling system is employed in a marine engine including a V-type cylinder block with two cylinder banks and a valley between the banks. Each cylinder bank includes a plurality of cylinder bores (e.g., each cylinder bank includes three cylinder bores in a six cylinder engine), and respective exhaust ducts extend from and are in flow communication with each cylinder bore. Respective coolant flow paths extend from the valley to a section of each cylinder bore water jacket adjacent each cylinder exhaust duct. Specifically, water is provided from the valley to adjacent each exhaust duct in the cylinder banks. Each cylinder bore water jacket includes an outlet at an upper portion of each said cylinder bank.

Abstract: A system and method for facilitating cold starting of a direct injected, two-stroke engine. The engine utilizes a fuel injection system that is controlled to inject a fuel into a combustion chamber just before the piston reaches top dead center, at least during cold starting. This permits better atomization of a variety of fuels to promote dependable cold starting of the engine even when combusting a fuel type such as kerosene.

Abstract: An engine in which the cylinders are scavenged according to a cross scavenging technique. The engine includes one or more cylinders in each of which a piston is disposed for reciprocal motion. The engine further includes a direct fuel injection system that allows controlled input of fuel into each cylinder to promote more efficient operation of the cross scavenged engine.

Abstract: An engine that can operate on a plurality of fuel types. The engine includes one or more cylinders, a fuel injection system and an electronic control unit. The electronic control unit has stored a plurality of fuel maps corresponding to the plurality of fuel types.

Abstract: A fuel delivery system uses a single electric fuel pump to deliver fuel to a fuel injected engine and returns excess fuel to the single electric fuel pump via a vapor separator and two pressure regulators. A primer bulb draws fuel from a fuel tank with a fuel supply line and transfers the fuel to the single electric fuel pump. The single electric fuel pump delivers fuel to a fuel rail assembly, which enables fuel to be distributed to each fuel injector during engine operation. A fuel return line connects the fuel rail assembly to the single electric fuel pump via the vapor separator to remove excess fuel from the fuel rail assembly and to transfer the excess fuel back to the single electric fuel pump for re-circulation. The first pressure regulator maintains a substantially constant pressure within the fuel injectors while the vapor separator purges entrained gas from the excess liquid fuel to avoid vapor lock.

Abstract: A dead-headed or returnless fuel delivery system uses a single electric fuel pump to deliver fuel to a two-stroke fuel injected engine. The fuel pump draws fuel from a fuel tank via a fuel supply network or a fuel supply line, transfers the fuel through a fuel connector and a fuel filter, and delivers the fuel to a vapor separator. Fuel is then distributed to the fuel injectors without returning any fuel to the fuel delivery system. An engine control unit (ECU), connected to a pressure sensor, supplies a fuel supply signal to the fuel pump to maintain the supplied pressure P at a reference pressure Po.