Internal-combustion engines – Starting device – With fuel or intake air control
Patent
1992-12-24
1994-05-10
Dolinar, Andrew M.
Internal-combustion engines
Starting device
With fuel or intake air control
261DIG67, F02M 110
Patent
active
053098757
ABSTRACT:
An internal combustion engine having a carburetor including a float bowl that is internally vented through a venting path that extends from the carburetor bore to the headspace above the fuel in the bowl. An external bowl vent passageway extends through the carburetor body to permit air communication between the atmosphere external of the carburetor and the headspace. A thermally actuated valve is secured to a sheet metal cowling on the engine. A flexible tube is secured from the external vent passageway to the valve. While the engine is cold, the valve is open to permit the float bowl to be externally vented to the atmosphere, thereby providing a relatively rich fuel mixture which aids in starting the engine. Upon sustained engine operation and the attainment of a predetermined temperature, the valve closes the external vent passageway, thereby causing the float bowl to be internally vented only, thereby leaning out the fuel/air mixture to a desired emissions level during engine operation.
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Dolinar Andrew M.
Tecumseh Products Company
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