Internal-combustion engines – Multiple cylinder
Patent
1992-08-28
1993-12-28
Argenbright, Tony M.
Internal-combustion engines
Multiple cylinder
123 52MV, 123 52MC, F02M 3500
Patent
active
052730107
ABSTRACT:
A one-piece integrally molded intake manifold is for an engine having opposed cylinders. The intake manifold comprises a plurality of runners each of which is coiled about a runner center. The runners are arranged side-by-side so that the runner centers lie on a common manifold axis. Adjacent ones of the runners are oppositely curved and interdigitated with one another so that a generally cylindrical plenum is defined by the space around which the runners are coiled. Each of the runners includes a runner inlet and upper and side runner surfaces adjoining the runner inlet. The portion of the upper and side runner surfaces adjoining the runner inlet are outwardly flared so that the cross section of the runner decreases from the runner inlet into the runner. The intersections between the upper and side runner surfaces are rounded. Air in the plenum can flow through the flared runner inlets into the runners. The runners direct the air therein to flow in curved paths of opposite sense to cylinder inlet ports of the opposed cylinders. The one-piece intake manifold is integrally molded by a method and apparatus including cores having flared inlet and side surfaces, bell-mouth recesses, and arcuate runner ears and ear recesses.
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Cadillac Rolls Out New DOHC V-8 in '93 Allante, WARD's Engine and Vehicle Technology Update, Jan. 15, 1992, p. 4.
John McElroy, Cadillac's Northstar V8, Automotive Industries, Jan. 1992, pp. 28-31.
Argenbright Tony M.
General Motors Corporation
Macy M.
Veenstra Charles K.
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