Back draft carburetor for two cycle engines

Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports

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261 72R, 261DIG67, F02M 508

Patent

active

040403998

ABSTRACT:
Vacuum, created by venturi effect of the throttle valve within the throat of a carburetor of a two cycle outboard motor, in company with a vacuum source orifice positioned opposite a peripheral edge of the throttle valve, is partially applied, by strategic placement of a vacuum source hole, to the fuel float chamber of the carburetor to reduce fuel flow over a selected range of engine RPM; normally when the boat it is driving is cruising on plane. A changeable vent to atmosphere is used to adjust the vacuum level to compensate for altitude changes and to adjust the carburetor to a particular motor. An expansion chamber in the vacuum source line may be required to prevent engine hesitation upon acceleration.

REFERENCES:
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patent: 1799585 (1931-04-01), Ensign
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patent: 2023647 (1935-12-01), Schmid
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patent: 2750171 (1956-06-01), Udale
patent: 2752136 (1956-06-01), Gardner
patent: 2906251 (1959-09-01), Soder, Jr.
patent: 3037751 (1962-06-01), Phillips

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