Modular fuel control apparatus

An internal combustion engine including a cylinder block having at least one cylinder bore therein, a head having an inner wall mounted on said cylinder block, at least one piston reciprocally movable in the at least one cylinder bore, the at least one piston having a top face, at least one combustion chamber defined by the inner wall of the cylinder head and the top face of the at least one piston, at least one intake valve movably mounted on the cylinder head in communication with the at least one combustion chamber, an exhaust valve movably mounted on the cylinder head in fluid communication with the at least one combustion chamber, the combination comprising:

• a modular air passage mechanism having an air intake end and an air outlet end, said modular air passage mechanism being constructed and arranged to accommodate airflow therethrough, the airflow to be delivered to the at least one combustion chamber after passing through the air passage mechanism;
• a modular fuel regulator mechanism constructed and arranged to communicate with the airflow in the air passage mechanism and a fuel supply to regulate an amount of fuel delivered to the at least one combustion cylinder;
• and
• a modular fuel pressure modifying mechanism constructed and arranged to receive fuel from the fuel supply and deliver the fuel at a pressure that is different from the fuel supply to the modular fuel regulator mechanism;
• wherein each of the modular fuel pressure modifying mechanism and the modular fuel regulator mechanism are removably mountable to the modular air passage mechanism independently from each other.

A fuel control apparatus for an internal combustion engine, said fuel control apparatus comprising:

• a modular air passage mechanism having an air intake end and an air outlet end, said modular air passage mechanism being constructed and arranged to accommodate airflow therethrough, the modular air passage mechanism having a first surface portion formed on an outer surface thereon;
• a modular fuel pressure modifying mechanism constructed and arranged to receive fuel from a supply and deliver a portion of the fuel at a pressure that is different from the pressure of the fuel supply, the modular fuel pressure modifying mechanism being removably mountable to the first surface portion of the air passage mechanism;
• the modular fuel pressure modifying mechanism constructed and arranged to be calibrated prior to being mounted to the air passage mechanism;
• wherein the modular fuel pressure modifying mechanism comprises a second surface portion formed thereon, the second surface portion corresponding to the first surface portion of the air passage mechanism when the modular fuel pressure modifying mechanism is removably mounted thereto;
• and
• wherein each of the modular fuel pressure modifying mechanism and the modular fuel regulator mechanism are adapted to be removably mounted to the modular air passage mechanism independently from each other.

A fuel control apparatus for an internal combustion engine, said fuel control apparatus comprising:

• a modular air passage mechanism having an air intake end and an air outlet end, said modular air passage mechanism being constructed and arranged to accommodate airflow therethrough, the modular air passage mechanism having a first surface portion formed on an outer surface thereon;
• a modular fuel pressure modifying mechanism constructed and arranged to receive fuel from a supply and deliver a portion of the fuel at a pressure that is different from the pressure of the fuel supply, the modular fuel pressure modifying mechanism being removably mountable to the first surface portion of the air passage mechanism;
• the modular fuel pressure modifying mechanism constructed and arranged to be calibrated prior to being mounted to the air passage mechanism;
• a modular fuel regulator mechanism constructed and arranged to communicate with the airflow in the air passage mechanism and the modular fuel pressure modifying mechanism to regulate an amount of fuel delivered to the engine;
• a venturi being mounted with the airflow channel of the main body, the venturi constructed and arranged to cause a pressure differential in the air flowing through the air passage mechanism, the pressure differential being the difference between air pressure generated by the venturi and air pressure generated by the impact of ambient air onto the modular air passage mechanism, said ambient air being substantially unaffected by the venturi, the pressure differential to be communicated to the fuel regulator mechanism;
• wherein the venturi is formed in the shape of a bullet, the venturi being constructed and arranged to cause a drop in the air pressure as the air flows over the venturi;
• and
• wherein the venturi has a central axis, a forward end and a rearward end, and further comprises an internal airflow path formed substantially along the axis of the venturi, the internal airflow path comprising a nozzle shaped inlet and an annular outlet connected by an internal duct, the annular outlet positioned intermediate said forward and rearward ends, the venturi being constructed and arranged such that air flowing over an outer surface of the venturi causes a drop in air pressure, the drop in air pressure to be communicated to the nozzle shaped inlet via the annular outlet and internal duct which in turn increases a pressure drop generated by the nozzle shaped inlet.

A fuel control apparatus for an internal combustion engine, said fuel control apparatus comprising:

• a modular air passage mechanism having an air intake end and an air outlet end, said modular air passage mechanism being constructed and arranged to accommodate airflow therethrough, the modular air passage mechanism having a first surface portion formed on an outer surface thereon;
• a modular fuel pressure modifying mechanism constructed and arranged to receive fuel from a supply and deliver a portion of the fuel at a pressure that is different from the pressure of the fuel supply, the modular fuel pressure modifying mechanism being removably mountable to the first surface portion of the air passage mechanism;
• the modular fuel pressure modifying mechanism constructed and arranged to be calibrated prior to being mounted to the air passage mechanism;
• a modular fuel regulator mechanism constructed and arranged to communicate with the airflow in the air passage mechanism and the modular fuel pressure modifying mechanism to regulate an amount of fuel delivered to the engine;
• wherein the modular air passage mechanism further comprises an airflow inhibiting device pivotally mounted within the airflow channel, said airflow inhibiting mechanism constructed and arranged to be actuated by a user, wherein actuation of the airflow inhibiting device varies its orientation within the channel to regulate the amount of air that flows therethrough to the engine;
• wherein said modular fuel regulator mechanism further comprises an air diaphragm separating a first air diaphragm chamber and a second air diaphragm chamber and the impact air pressure to communicate with the second air diaphragm chamber;
• wherein the modular pressure modifying mechanism further comprises a fuel inlet port for receiving fuel from the fuel supply;
• wherein the modular pressure modifying mechanism further comprises a control valve that is constructed and arranged to split the flow of fuel into a first path and a second path, said first path being a path from unmetered fuel in direct communication with the modular fuel regulator mechanism;
• wherein the control valve is constructed and arranged to be actuated by the user;
• wherein the second path if a path for metered fuel and is to be communicated with the fuel regulator mechanism;
• the modular pressure modifying mechanism further comprising a metered fuel valve actuated by the user, the metered fuel valve being constructed and arranged such that actuation thereof regulates the amount of fuel that flows from the second path to the engine, the metered fuel valve also being constructed and arranged to vary the engine speed from an idle power to a full power, the metered fuel valve at idle power being in an idle speed position and at full power being in a full power position;
• and
• wherein the modular pressure modifying mechanism further comprising a bypass channel constructed and arranged to divert fuel from the control valve and deliver the diverted fuel to the fuel supply when the engine is at low power, to thereby increase the fuel flow from the fuel supply at low engine power.