Starting enrichment of alternate firing two cycle internal combu

Details Starting enrichment of alternate firing two cycle internal combu Starting enrichment of alternate firing two cycle internal combu

1984-07-26

1985-04-09

Lall, Parshotam S.

Internal-combustion engines

Starting device

For airplane

123 73A, 123 73R, 261DIG68, F02N 1700

Patent

active

045094721

ABSTRACT:
A two cycle internal combustion engine (10) has at least two cylinders (12, 13) which fire alternately with pressure in one crankcase (17 or 18) at the time there is vacuum in the other. Supplemental fuel flow passages (36, 41) extend from each crankcase and are joined at a common passage (46) connected to the float bowl (30) of the carburetor (20). A normally closed control valve (48) is disposed in the common passage. When the engine is to be started, the control valve is opened so that fuel enters the supplemental and common passage. Initial rotation of the crankshaft (16) causes pressure in one crankcase to force fuel toward the other crankcase, which has vacuum. Further crankshaft rotation reverses the pressures so that fuel is then forced toward the opposite crankcase. Continued engine operation with the control valve open causes alternate fuel flow reversals together with pressurized alternate fuel injections into the respective crankcases, which are independent of the throttle setting.

REFERENCES:
patent: 3472211 (1969-10-01), Meininger
patent: 3759493 (1973-09-01), Blanchard et al.
patent: 3934571 (1976-01-01), Mennesson
patent: 4186697 (1980-02-01), Yasuda et al.
patent: 4333425 (1982-06-01), Kusche
patent: 4373479 (1983-02-01), Billingsley et al.

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