Internal-combustion engines – Intake manifold – For in-line engine
Patent
1994-08-09
1997-08-26
McMahon, Marguerite
Internal-combustion engines
Intake manifold
For in-line engine
F02B 7500
Patent
active
056601549
ABSTRACT:
An improved intake manifold, for uniformly charging each cylinder of a multi-cylinder internal combustion engine. The manifold comprises a structure having bifurcated branches which define multiple through passageways, each passageway fluidly connecting the air inlet of the manifold to the intake valve chamber of one of the cylinders. For eight-cylinder engine, each through passageway encounters four fluid flow channels distinguishable by three bifurcations in the structure between the intake valve chamber at which the passageway terminates and the air inlet. The engine firing sequence dictates which through passageways share a fluid flow channel in common beyond each successive bifurcation in the structure. The through passageways are grouped together so that the frequency of passage of a fuel/air mixture through that portion or stage of each through passageway located immediately upstream of any given bifurcation is twice the frequency of passage of such a mixture through that stage of the through passageway located immediately downstream thereof. Downstream of each final bifurcation, a fuel/air mixture can be fed into either of two intake valve chambers but only at intervals 360 degrees of crankshaft revolution apart. Since racing engines operate with each intake valve open for roughly 300 degrees of the crankshaft revolution, only one intake valve is ever open at any given time downstream of each final bifurcation, providing a maximum separation between the closing of one intake valve and the opening of another both fed by through passageways paired at the final bifurcation.
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Tri-Y V-8 Exhaust Header-Firing Order:1, 8, 4, 3, 6, 5, 7, 2.
180 Degree Exhaust Headers-Firing Order:1, 8, 4, 3, 6, 5, 7, 2.
"Manifold Designs"; (Publication Date Unknown); p. 139; Chevy High Performance Magazine.
"The Pipes Are Callling"; Oct., 1993; p. 50; Chevy High Performance Magazine.
4-2-1 Exhaust Manifold-Firing Order: 1, 3, 42.
GM's Dual Plane 180.degree. Intake Manifold-Firing Order 1, 8, 4, 3, 6, 5, 7, 2.
Leon Harry I.
McMahon Marguerite
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