Early fuel evaporation intake manifold

Claim 2

In combination with an internal combustion engine having a combustion chamber, an exhaust passage receiving exhaust gases from the combustion chamber, an early fuel evaporation intake manifold comprising: a first manifold member having an induction passage for delivering a mixture of fuel and air to the combustion chamber; a second manifold member; an opening in a surface of said first manifold member fluidly connected with said induction passage; a surface on said second manifold member mating with said surface of said first manifold member; a thin wall thermally conductive gasket positioned between said surfaces of said manifold members; means clamping said gasket between said manifold members; inlet means in said second manifold member fluidly connected to the exhaust passage; outlet means in said second manifold member fluidly connected with the exhaust passage; an upwardly opening channel in said surface of said second manifold member, said channel extending between the inlet means and the outlet means, said gasket defining with said channel a crossover flow passage between said inlet means and outlet means, said crossover flow passage being sufficiently restrictive to accelerate exhaust gas velocity and establish turbulent exhaust gas flow at said gasket to prevent a stagnant fluid film thereat to promote rapid heating of the latter such that any liquid fuel in said fuel mixture is rapidly heated and vaporized upon contact therewith.

Claim 3

An early fuel evaporation manifold for an internal combustion engine having a combustion chamber and exhaust gas outlet passages for receiving exhaust gases from the combustion chamber, said manifold including a first member and a second member, said first member having an induction passage adapted to be fluidly connected with a carburetor for delivering a mixture of fuel and air to the combustion chamber, an opening in the first member fluidly communicating with said induction passage, a first passage in one of said members having an inlet communicating with said exhaust outlet passage, a second passage in one of said members having an outlet fluidly connected with an exhaust outlet passage remote from the combustion chamber and said first exhaust outlet passage, a thin thermally conductive gasket engaging said first member, said gasket having a heat exchange surface covering said opening; a second member having a surface engaging the gasket and conformable to said surface of said first member; means for clamping the gasket and said second member against said first member, a channel in said second member opening toward said gasket in close proximity to said heat exchanger surface, said channel flaring thereat to define a high aspect-ratio restrictive exhaust gas crossover passage for accelerating exhaust gas velocity through the crossover passage to break up the fluid film at said heat exchanger surface, a duct connecting the first passage and the crossover passage and disposed at an angle with respect to the heat exchanger such that the exhaust gases are directed against the heat exchange surface and spread out through said crossover passage for maximum heat transfer therewith, the heat exchange surface is effective to vaporize any liquid impinging thereupon.

Claim 4

An early fuel evaporation manifold for an internal combustion engine having a combustion chamber and exhaust gas outlet passages for receiving exhaust gases from the combustion chamber, said manifold including a first member and a second member, said first member having an induction passage adapted to be fluidly connected with a carburetor for delivering a mixture of fuel and air to the combustion chamber, an opening in the first member fluidly communicating with said induction passage, a first passage in one of said members having an inlet communicating with said exhaust outlet passage, a second passage in one of said members having an outlet fluidly connected with an exhaust outlet passage remote from the combustion chamber and said first exhaust outlet passage, a thin thermally conductive gasket engaging said first member, said gasket having a heat exchange surface covering said opening; a second member having a surface engaging the gasket and conformable to said surface of said first member; means for clamping the gasket and said second member against said first member, a channel in said second member opening toward said gasket in close proximity to said heat exchanger surface, said channel flaring thereat to define a high aspect-ratio restrictive exhaust gas crossover passage for accelerating exhaust gas velocity through the crossover passage to break up the fluid film at said heat exchanger surface, a duct connecting the first passage and the crossover passage and disposed at an angle with respect to the heat exchanger such that the exhaust gases are directed against the heat exchange surface and spread out through said crossover passage for maximum heat transfer therewith, the heat exchange surface is effective to vaporize any liquid impinging thereupon.

Claim 5

An early fuel evaporation manifold for internal combustion engine having a pair of angularly disposed banks of cylinders including exhaust outlet passages, said manifold comprising an upper casting adapted to have a carburetor mounted on an upper surface thereof for delivering a mixture of fuel and air to the combustion chamber; a plurality of vertically extending riser bores having inlets adapted to be fluidly connected with said carburetor and downwardly terminating with plenums having openings at the lower surface thereof, induction passages in said upper casting for fluidly connecting said plenums with said combustion chamber, a first exhaust passage extending laterally on one side of said manifold having an inlet communicating with one of saiD exhaust passages on one of the cylinder banks, said first exhaust passage discharging at a lower surface of the upper casting, a second exhaust passage extending laterally on the other side of said upper casting having an outlet communicating with one of the exhaust passages on the other of the cylinder banks and having an inlet in the lower surface of said upper casting, a thin thermally conductive gasket engaging the lower surface of said upper casting, said gasket having heat exchange surfaces covering the openings in said plenums, said gasket having openings therein registering with said first and second exhaust passages, a lower casting having an upper surface engaging said gasket and conformable to the lower surface of said upper casting, bolts clamping the lower casting and gasket against said upper casting, an undulating cored channel formed in said lower casting having an inlet fluidly communicating with said first exhaust passage and an outlet fluidly communicating with said second exhaust passage, said channel including a vertical duct terminating at a first dome section lying in close proximity with one of the heat exchangers, a V-shaped center section including another vertical duct terminating at a second dome section lying in close proximity to another of the heat exchangers, said channel and said gasket defining an exhaust crossover passage at said dome sections having a restrictive flow area for accelerating the exhaust gas flow therethrough and having a width greater than ten times the height thereat thereby establishing a restrictive high aspect-ratio duct such that the exhaust gases leaving said vertical ducts are directed substantially normal to the heat exchangers and spread out through said crossover passage at a high velocity turbulent flow therethrough and for maximum heat transfer therewith, said exhaust crossover passage discharging at said second exhaust passage with a downwardly extending vertical passage whereby an exhaust gas flow through said crossover passage is effective to rapidly heat said heat exchanger such that any liquid fuel impinging thereupon is rapidly evaporized therefrom.

Claim 6

An early fuel evaporation manifold for internal combustion engine having a pair of angularly disposed banks of cylinders including exhaust outlet passages, said manifold comprising an upper casting adapted to have a carburetor mounted on an upper surface thereof for delivering a mixture of fuel and air to the combustion chamber; a plurality of vertically extending riser bores having inlets adapted to be fluidly connected with said carburetor and downwardly terminating with plenums having openings at the lower surface thereof, induction passages in said upper casting for fluidly connecting said plenums with said combustion chamber, a first exhaust passage extending laterally on one side of said manifold having an inlet communicating with one of saiD exhaust passages on one of the cylinder banks, said first exhaust passage discharging at a lower surface of the upper casting, a second exhaust passage extending laterally on the other side of said upper casting having an outlet communicating with one of the exhaust passages on the other of the cylinder banks and having an inlet in the lower surface of said upper casting, a thin thermally conductive gasket engaging the lower surface of said upper casting, said gasket having heat exchange surfaces covering the openings in said plenums, said gasket having openings therein registering with said first and second exhaust passages, a lower casting having an upper surface engaging said gasket and conformable to the lower surface of said upper casting, bolts clamping the lower casting and gasket against said upper casting, an undulating cored channel formed in said lower casting having an inlet fluidly communicating with said first exhaust passage and an outlet fluidly communicating with said second exhaust passage, said channel including a vertical duct terminating at a first dome section lying in close proximity with one of the heat exchangers, a V-shaped center section including another vertical duct terminating at a second dome section lying in close proximity to another of the heat exchangers, said channel and said gasket defining an exhaust crossover passage at said dome sections having a restrictive flow area for accelerating the exhaust gas flow therethrough and having a width greater than ten times the height thereat thereby establishing a restrictive high aspect-ratio duct such that the exhaust gases leaving said vertical ducts are directed substantially normal to the heat exchangers and spread out through said crossover passage at a high velocity turbulent flow therethrough and for maximum heat transfer therewith, said exhaust crossover passage discharging at said second exhaust passage with a downwardly extending vertical passage whereby an exhaust gas flow through said crossover passage is effective to rapidly heat said heat exchanger such that any liquid fuel impinging thereupon is rapidly evaporized therefrom.