Internal-combustion engines – Two-cycle – Whirl through piston-controlled ports
Patent
1977-06-13
1979-06-26
Myhre, Charles J.
Internal-combustion engines
Two-cycle
Whirl through piston-controlled ports
261 35, 261DIG68, F02B 7502, F02M 1704
Patent
active
041590120
ABSTRACT:
A port in the cylinder wall of a two-stroke cycle engine is connected by a passage and a restricted orifice with the idle reservoir of a diaphragm type carburetor. The idle reservoir is connected through an adjustable idle mixture valve with the metering chamber. The passage from the engine port is connected by a vent passage with the venturi of the carburetor. The dry side of the metering diaphragm is vented by a restricted opening and is connected with the dry side of a crankcase pressure operated fuel pump through a passageway having therein a check valve and a valve which is open when the choke valve is closed. This connection allows pressure pulses from the crankcase to influence fuel flow so that the desired fuel flow is obtained under more than one engine operating condition. In addition fuel is introduced directly into the crankcase at idle speeds instead of into the throttle bore giving more stable idle condition. Crankcase pressure is used to increase the pressure on the dry side of the metering diaphragm for starting the engine under extreme cold conditions or when the engine is in "vapor lock." In open throttle, no load condition the mixture is enriched so as to limit engine speed.
REFERENCES:
patent: 3320937 (1967-05-01), Meininger
patent: 3441010 (1969-04-01), Barr et al.
patent: 3453994 (1969-07-01), Nutten et al.
patent: 3472211 (1969-10-01), Meininger
patent: 3738623 (1973-06-01), Tuckey
patent: 3743254 (1973-07-01), Tuckey
patent: 3746320 (1973-07-01), Van Camp et al.
Marino Joseph R.
Pizzuto Russell
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Myhre Charles J.
Reynolds David D.
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