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US 4,069,796 AGranted
Engine manifold with air gap insulator carburetor mounting
AssigneeGeneral Motors Corporation
InventorRichard L. Balsley
Life of this patent
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AssigneeGeneral Motors Corporation
InventorRichard L. Balsley
Estimating the term…
The intake manifold of an internal combustion engine has incorporated therein a bottom mixture plenum in heat transfer relationship for heating thereof by exhaust gases discharged from the engine. The plenum receives the induction mixture for the engine through at least one inlet bore in the form of a tube perforated through its side wall to distribute air and crankcase ventilation fumes from an air chamber located directly under the carburetor pad of the intake manifold and to distribute recirculated exhaust gases from a second chamber positioned between the plenum and the air chamber, the second chamber being supplied with exhaust gases for recirculation, the air chamber providing, in effect, an air gap insulator to reduce the transfer of heat from the exhaust gases to a carburetor mounted on the conventional carburetor pad of the intake manifold.
An intake manifold means for an internal combustion engine having a cylinder block with a plurality of cylinders therein defining in part the combustion chambers of the engine, a carburetor and, an exhaust manifold, said intake manifold means having an intake mixture receiving plenum positioned to be heated by engine exhaust gases discharged into the exhaust manifold, a mounting pad for the carburetor on the opposite side of said intake manifold means from said mixture receiving plenum and positioned above said mixture receiving plenum, intake passage means in said intake manifold means extending from said mounting pad into communication with said mixture receiving plenum, intake flow passage means in said intake manifold means connecting said mixture receiving plenum and connectable to the combustion chambers of the engine, said intake manifold means having wall means therein defining an exhaust chamber directly above said mixture receiving plenum at least partly surrounding said intake passage means and in communication therewith, said exhaust chamber being connectable to a source of engine exhaust gases for the recirculation of exhaust gases into the mixture receiving plenum via said intake passage means and further defining an air chamber between said exhaust chamber and said mounting pad, said air chamber surrounding said intake passage means and being in fluid flow communication therewith and said air chamber being connectable to a source of induction fluid whereby said mounting pad is air cooled by induction fluid flowing through said air chamber and wherein said air chamber serves as an air gap insulator between said exhaust chamber and said mounting pad.
A cylinder head - intake manifold for an internal combustion engine having a cylinder block with a plurality of longitudinally aligned cylinders opening through a side wall thereof, a carburetor and, an exhaust manifold having a planar mounting surface with a plurality of exhaust openings therein connected by exhaust passage means to a central heat chamber therein with the upper wall of the heat chamber being defined by a part of the mounting surface;
Dependencies are inferred from the claim text.