Joseph J Marino

US Patent:

41590120, Jun 26, 1979

Filed:

Jun 13, 1977

Appl. No.:

5/806070

Inventors:

Russell Pizzuto - Charlotte NC
Joseph R. Marino - Charlotte NC

Assignee:

Textron Inc. - Providence RI

International Classification:

F02B 7502
F02M 1704

US Classification:

123 65R

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.

Address:

1600 SE 15 St APT 612, Fort Lauderdale, FL 33316

Phone:

(917)3247222

VIN:

WBANE735X7CM53054

Make:

BMW

Model:

5 SERIES

Year:

2007