Duplex carburetor and intake system for internal combustion engi

Details Duplex carburetor and intake system for internal combustion engi Duplex carburetor and intake system for internal combustion engi

1982-01-08

1984-06-05

Lazarus, Ira S.

Internal-combustion engines

Charge forming device

Multiple carburetors

123 59PC, 123336, 123308, 123342, 261 23A, 261 41C, F02B 1300

Patent

active

044522185

ABSTRACT:
A duplex carburetor for an internal combustion engine has a primary barrel having a primary venturi for supplying an air-fuel mixture to an intake manifold under a full range of engine loads and a secondary barrel having a secondary venturi for supplying an air-fuel mixture to the manifold under higher engine loads. The primary venturi has a cross section which ranges from 20% to 30% of that of the secondary venturi. The secondary barrel has a flattened cross-sectional shape such as of a segment of a circle of an ellipse, and is located adjacent to the primary barrel. The intake manifold is of a duplex construction having primary and secondary common passages connected to the primary and secondary barrels, respectively, of the carburetor. The secondary passage of the manifold has a flattened cross-sectional shape such as of a segment of a circle or an ellipse, and is positioned adjacent to the primary passage. The primary passage extends through a region where the secondary passage is divided into a plurality of secondary branches, and is located immediately in front of the shortest one of the secondary branch. The primary passage is also branched into a plurality of primary branches, the shortest of which is displaced out of axial alignment with a central axis of the intake manifold.

REFERENCES:
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patent: 3916860 (1975-11-01), Nakano et al.
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patent: 4065920 (1978-01-01), Minami et al.
patent: 4347816 (1982-09-01), Saito et al.

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