Porting arrangement for two cycle engine

Details Porting arrangement for two cycle engine Porting arrangement for two cycle engine

1998-03-11

2000-02-01

Wolfe, Willis R.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65PD, F02B 1700

Patent

active

060190744

ABSTRACT:
A number of embodiments of two cycle crankcase compression internal combustion engines having at least two cylinders in a common bank in side-by-side relationship. Each embodiment incorporates a main Schnurle type scavenging system that includes a pair of main scavenge passages on opposite sides of the exhaust passage that terminate in main scavenge ports that are disposed in proximity to and on opposite sides of the exhaust port. A transversely extending supplemental scavenge passage is provided for delivering a charge to the combustion chamber to somewhat restrict the scavenging flow so as to prevent fuel from passing out of the exhaust port. Fuel is injected into proximity with this supplemental scavenge passage. This facilitates stratification of the fuel charge. The ports are rotated from normal around the cylinder bore axis in many embodiments to provide a more compact construction. Even in those embodiments where this is not done, the fuel injectors are mounted so that they can be easily accessed from outside of the engine body. Various applications for the engine such as a motorcycle, personal watercraft and outboard motor are depicted.

REFERENCES:
patent: 1520620 (1924-12-01), Wall
patent: 3074388 (1960-04-01), Kruckenberg
patent: 3425399 (1969-02-01), Ward et al.
patent: 4821687 (1989-04-01), Iwai
patent: 5477838 (1995-12-01), Schlunke et al.
patent: 5623895 (1997-04-01), Masuda et al.
patent: 5671703 (1997-09-01), Otome et al.

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