Exhaust arrangement for a 2-cycle engine

Details Exhaust arrangement for a 2-cycle engine Exhaust arrangement for a 2-cycle engine

1993-09-10

1995-03-21

Dolinar, Andrew M.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65PD, F02B 7502

Patent

active

053986466

ABSTRACT:
An exhaust port is formed in the wall of a cylinder of a 2-cycle engine. At least one of the portions of the cylinder wall which define two vertically opposing edges of the exhaust port is projected at the circumferentially mid portion towards the opposing edge so as to provide a piston guide surface which conforms with the inner peripheral surface of the cylinder and which extends in such a manner as to reduce the axial height of the exhaust port. The piston guide surface serves to suppress vibration and noise caused when an upwardly moving piston falls into the exhaust port.

REFERENCES:
patent: 4458636 (1984-07-01), Kania
patent: 4557227 (1985-12-01), Woodard
patent: 4566409 (1986-01-01), Yashiro et al.
patent: 4643140 (1987-02-01), Whipple
patent: 4651686 (1987-03-01), Kania
patent: 5054441 (1991-10-01), Nakatani et al.
patent: 5086734 (1992-02-01), Nakai

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