Exhaust manifold and an improved exhaust manifold, intake manifold and engine combination
AssigneeEdelbrock Corporation
InventorJames D. McFarland, Jr.
Life of this patent
Estimating the term…
Abstract
An exhaust manifold for an engine has sets of branches tuned to the fundamental frequency of exhaust products but with the branch length of the sets different so that the engine speed at which resonance occurs in each set is different. An inlet manifold has runner sets with each set being paired with an exhaust manifold branch set serving the same cylinders and tuned to effect resonance of combustion air in the runners at the same engine speed that resonance occurs in its associated exhaust branches.
Claims21
In combination with an internal combustion engine of the type having a plurality of cylinders, a reciprocating piston in each cylinder, at least one inlet port and valve into each cylinder, at least one exhaust port and valve from each cylinder, an inlet manifold for conducting combustion air into the cylinders through the inlet ports, and an exhaust manifold for exhausting products of combustion from the cylinders through the exhaust ports, an improvement comprising:
- (a) at least two different sets of runners of the inlet manifold, each being tuned to a predetermined resonant frequency of air to effect resonance at a different engine speed from the other;
- (b) at least two different sets of branches of the exhaust manifold, each being matched to a different one of the runner sets and tuned to a predetermined resonant frequency of the products of combustion of the engine to effect resonance at the same engine speed as its matched runner set.
In combination with an internal combustion engine of the type having a plurality of cylinders, a reciprocating piston in each cylinder, at least one inlet port and valve into each cylinder, at least one exhaust port and valve from each cylinder, an inlet manifold having a plurality of runners for conducting combustion air into the cylinders through the inlet ports, and an exhaust manifold having a plurality of branches for exhausting products of combustion from the cylinders through the exhaust ports, an improvement comprising:
- (a) two sets of runners of the inlet manifold, each set of runners being tuned to produce resonance in combustion air at standard temperature at substantially different engine speeds from the other;
- and
- (b) two sets of branches of the exhaust manifold, one set of branches being tuned to produce resonance in exhaust products at the engine speeds that one of the sets of runners produce resonance and the other set of branches being tuned to produce resonance in exhaust products at the engine speeds that the other set of runners produce resonance.
An improved exhaust manifold for an internal combustion engine of the type that has a plurality of cylinders, a reciprocating piston for each cylinder, and at least one exhaust port and valve for each cylinder for passing products of combustion from the cylinder, the exhaust manifold comprising:
- (a) a first set of branches for serving a first set of the engine's cylinders;
- (b) a second set of branches for serving a second set of the engine's cylinders;
- (c) the branches of the first set being tuned to a predetermined resonant frequency of the products of combustion to effect resonance within a first selected range of engine speeds;
- and
- (d) the branches of the second set being tuned to a predetermined resonant frequency of the products of combustion to effect resonance within a second selected range of engine speeds differing substantially from the first selected range of engine speeds to develop with the first set a broad torque band of relatively high value.
Dependencies are inferred from the claim text.