US 4,300,513 A · Carburetor attachment

Abstract

A plate mounted between the carburetor and intake manifold having horizontally extending passageways and inlet and outlet ports communicating with four vertical apertures aligned with the passageways of the carburetor and intake manifold. Double-walled tubular heat exchangers, formed of spaced apart outer and inner jackets, are disposed in the vertical apertures, the spaces between the outer and inner jackets communicating with the plate passageways and being sealed from the inside of the inner jackets, such that engine coolant can be circulated through such spaces and through the plate to cause preheating of the fuel-air mixture as it passes through the inside of the exchangers and into the intake manifold. The inner periphery of each inner jacket has ring shaped serrations and a downward taper, which together with preheating by the heat exchangers results in significantly improved vaporization of the fuel-air mixture.

Claims13

Dependent claims

An attachment for connection with the cooling system of an internal combustion engine and for insertion between the carburetor and the intake manifold of the engine, comprising

heat transfer means including upright heat transfer tubes to be positioned between and in open communication with the air-fuel mixture conveying passages of the carburetor and intake manifold to pass the air-fuel mixture therethrough,
heat supplying means mounting and confining the outer peripheries of the heat transfer tubes and cooperating with the tubes in defining closed end annular heating fluid chambers around the tubes, the heat supplying means including a rigid plate to lie between the carburetor and intake manifold, the plate having transverse openings through which the heat transfer tubes extend, the peripheries of the transverse openings defining portions of said annular chambers,
the tubes and heat supplying means maintaining the interiors of the tubes and said annular chambers in fluid flow isolation relative to each other,
the plate having duct means therethrough in open flow communication with the transverse openings to direct hot engine coolant to and through the annular heating fluid chambers, the duct means having inlet and outlet ends for flow connections with the cooling system of the engine, and
the inner peripheries of the tubes being tapered convergently in a downward direction and having a multiplicity of substantially annular sharp cornered surface undulations defining upwardly facing ledges adjacent the sharp corners.

2 more elements

An attachment for connection with the cooling system of an internal combustion engine and for insertion between the carburetor and the intake manifold of the engine, comprising

heat transfer means including upright heat transfer tubes to be positioned between and in open communication with the air-fuel mixture conveying passages of the carburetor and intake manifold to pass the air-fuel mixture therethrough,
heat supplying means mounting and confining the outer peripheries of the heat transfer tubes and cooperating with the tubes in defining closed end annular heating fluid chambers around the tubes, the heat supplying means including a rigid plate to lie between the carburetor and intake manifold, the plate having transverse openings through which the heat transfer tubes extend, the peripheries of the transverse openings defining portions of said annular chambers,
the tubes and heat supplying means maintaining the interiors of the tubes and said annular chambers in fluid flow isolation relative to each other,
the plate having duct means therethrough in open flow communication with the transverse openings to direct hot engine coolant to and through the annular chambers for heating the tubes, the duct means having inlet and outlet ends for flow connections with the cooling system of the engine, and
the inner peripheries of the tubes being tapered convergently in a downward direction.

2 more elements

Dependencies are inferred from the claim text.

Carburetor attachment

Life of this patent

Carburetor attachment

Life of this patent

Abstract

Claims13