Fuel injection, two cycle engine

Claim 2

In a two cycle, spark ignition boat engine with a cylinder having a combustion chamber defined by a head and sidewall of said cylinder in conjunction with a piston reciprocating within said cylinder on combustion and return strokes via connection with a piston rod and crankshaft arrangement located within a crankcase, said crankcase isolated at all times from said combustion chamber; intake and exhaust means, communicating with said combustion chamber, for providing a combustible mixture in said chamber and for exhausting spent gases of combustion from said chamber, respectively; and a spark plug communicating with said chamber in order to ignite said mixture according to timing of a spark advance mechanism; said piston separating said combustion chamber from said crankcase, the improvement comprising: means for providing fuel and air into said combustion chamber to provide said combustible mixture therein during a compression stroke; means located in a lowermost portion of said crankcase for continuously injecting oil into said crankcase and for continuously draining oil from said crankcase in order to constantly impinge upon and lubricate parts therein and to cool said parts by heat absorption, said oil injecting means providing a generally cone-shaped spray in order to impinge oil on all moving parts within said crankcase and to facilitate operation of said engine while tilted; and means for venting said crankcase in order to prevent a buildup of pressure therein during said return stroke, said venting means comprising a tube communicating said crankcase with atmosphere, said tube having interior baffles in order to prevent passage of oil therethrough from said crankcase with said engine tilted; and a plenum attached to an outside of said sidewall and communicating with an intake port of said intake means and isolated at all times from communication with said crankcase; a fuel injection nozzle mounted in said plenum so as to inject fuel into said intake port according to said timing, whereby said nozzle is protected from said combustion by said piston covering said intake port prior to combustion; an air supply conduit communicating said plenum with a continuous air blower; and valve means for varying a supply of air to said plenum from said continuous air blower according to said timing.

Claim 3

An improvement as in claim 1, wherein: said intake and exhaust means respectively comprise intake and exhaust ports through said cylinder sidewall, said exhaust port being located farther from said cylinder head than said intake port, such that said piston closes said exhaust port prior to closing said intake port during said compression stroke in order to minimize losses of said combustible mixture.

Claim 4

An improvement as in claim 1, and wherein said oil injecting means comprises: a nozzle generally centered upon a longitudinal axis of said cylinder to effect said generally cone-shaped spray of oil.

Claim 5

In a two cycle, spark ignition engine with a cylinder having a combustion chamber defined by a head and sidewall of said cylinder in conjunction with a piston reciprocating within said cylinder on combustion and return strokes via connection with a piston rod and crankshaft arrangement located within a crankcase, said crankcase isolated at all times from said combustion chamber; intake and exhaust means, communicating with said combustion chamber, for providing a combustible mixture in said chamber and for exhausting spent gases of combustion from said chamber, respectively; and a spark plug communicating with said chamber in order to ignite said mixture according to timing of a spark advance mechanism; said piston separating said combustion chamber from said crankcase, the improvement comprising: means for providing fuel and air into said combustion chamber to provide said combustible mixture therein during a compression stroke; means for pumping oil from a reservoir to a means located in a lowermost portion of said crankcase for continuously injecting oil into said crankcase in a generally cone-shaped spray and means for continuously draining oil from said crankcase back into said reservoir in order to constantly impinge upon and lubricate parts in said crankcase and to cool said parts by heat absorption hile circulating said oil and to facilitate operation of said engine while tilted; and means for venting said crankcase in order to prevent a pressure buildup therein during said return stroke, said venting means comprising a tube communicating said crankcase with atmosphere, said tube communicating with said atmosphere via an unfilled portion of said reservoir and a venting cap for said reservoir and a plenum attached to an outside of said sidewall and communicating with an intake port of said intake means and isolated at all times from communication with said crankcase; a fuel injection nozzle mounted in said plenum so as to inject fuel into said intake port according to said timing, whereby said nozzle is protected from said combustion by said piston covering said intake port prior to combustion; an air supply conduit communicating said plenum with a continuous air blower; and valve means for varying a supply of air to said plenum from said continuous air blower according to said timing.

Claim 6

In a two cycle, spark ignition engine with a cylinder having a combustion chamber defined by a head and sidewall of said cylinder in conjunction with a piston reciprocating within said cylinder on combustion and return strokes via connection with a piston rod and crankshaft arrangement located within a crankcase, said crankcase isolated at all times from said combustion chamber; intake and exhaust means, communicating with said combustion chamber, for providing a combustible mixture in said chamber and for exhausting spent gases of combustion from said chamber, respectively; and a spark plug communicating with said chamber in order to ignite said mixture according to timing of a spark advance mechanism; said piston separating said combustion chamber from said crankcase, the improvement comprising: means for providing fuel and air into said combustion chamber to provide said combustible mixture therein during a compression stroke; means for pumping oil from a reservoir to a means located in a lowermost portion of said crankcase for continuously injecting oil into said crankcase in a generally cone-shaped spray and means for continuously draining oil from said crankcase back into said reservoir in order to constantly impinge upon and lubricate parts in said crankcase and to cool said parts by heat absorption hile circulating said oil and to facilitate operation of said engine while tilted; and means for venting said crankcase in order to prevent a pressure buildup therein during said return stroke, said venting means comprising a tube communicating said crankcase with atmosphere, said tube communicating with said atmosphere via an unfilled portion of said reservoir and a venting cap for said reservoir and a plenum attached to an outside of said sidewall and communicating with an intake port of said intake means and isolated at all times from communication with said crankcase; a fuel injection nozzle mounted in said plenum so as to inject fuel into said intake port according to said timing, whereby said nozzle is protected from said combustion by said piston covering said intake port prior to combustion; an air supply conduit communicating said plenum with a continuous air blower; and valve means for varying a supply of air to said plenum from said continuous air blower according to said timing.

Claim 7

A retrofit kit for improving the efficiency of a two cycle, spark ignition engine having a cylinder and a combustion chamber defined by a head and sidewall of said cylinder in conjunction with a piston reciprocating within said cylinder on combustion and return strokes via connection with a piston rod and crankshaft arrangement located within a crankcase; intake and exhaust means, communicating with said combustion chamber, for providing a combustible mixture in said chamber and for exhausting spent gases of combustion from said chamber, respectively; and a spark plug communicating with said chamber in order to ignite said mixture according to timing of a spark advance mechanism; said piston separating said combustion chamber from said crankcase and opening and closing a fuel transfer path around said piston according to positions of said piston during said reciprocating in order that a fuel-air mixture is transferable from said crankcase to said combustion chamber, said fuel-air mixture being supplied to said crankcase from a carburetor via a valve assembly, said kit comprising: means for injecting fuel directly into said combustion chamber to provide said combustible mixture therein during a compression stroke; nozzle assembly means for continuously injecting oil into said crankcase and for continuously draining oil from said crankcase in order to constantly impinge upon and lubricate parts therein and to cool said parts by heat absorption, said nozzle assembly means replacing said carburetor and valve assembly during retrofitting of said engine with said kit; means for venting said crankcase in order to prevent a buildup of pressure therein during said return stroke, said venting means comprising a tube communicating said crankcase with the atmosphere; and plate means for blocking said fuel transfer path and for providing an air supply port to said combustion chamber from a blower.

Claim 8

A retrofit kit for improving the efficiency of a two cycle, spark ignition engine having a cylinder and a combustion chamber defined by a head and sidewall of said cylinder in conjunction with a piston reciprocating within said cylinder on combustion and return strokes via connection with a piston rod and crankshaft arrangement located within a crankcase; intake and exhaust means, communicating with said combustion chamber, for providing a combustible mixture in said chamber and for exhausting spent gases of combustion from said chamber, respectively; and a spark plug communicating with said chamber in order to ignite said mixture according to timing of a spark advance mechanism; said piston separating said combustion chamber from said crankcase and opening and closing a fuel transfer path around said piston according to positions of said piston during said reciprocating in order that a fuel-air mixture is transferable from said crankcase to said combustion chamber, said fuel-air mixture being supplied to said crankcase from a carburetor via a valve assembly, said kit comprising: means for injecting fuel directly into said combustion chamber to provide said combustible mixture therein during a compression stroke; nozzle assembly means for continuously injecting oil into said crankcase and for continuously draining oil from said crankcase in order to constantly impinge upon and lubricate parts therein and to cool said parts by heat absorption, said nozzle assembly means replacing said carburetor and valve assembly during retrofitting of said engine with said kit; means for venting said crankcase in order to prevent a buildup of pressure therein during said return stroke, said venting means comprising a tube communicating said crankcase with the atmosphere; and plate means for blocking said fuel transfer path and for providing an air supply port to said combustion chamber from a blower.