Exhaust port insert

Details Exhaust port insert Exhaust port insert

1993-10-07

1994-07-26

Argenbright, Tony M.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

251367, F02B 7502

Patent

active

053319273

ABSTRACT:
A two stroke cycle engine has an engine block with a cylinder bore accommodating a piston. An exhaust port connects the cylinder bore to an outside of the engine block. An exhaust port control valve mechanism within the engine, according to this invention, includes a valve pivotally mounted in the exhaust port between the cylinder bore and the outside for rotation between an open position and a closed position. The valve defines an upper timing edge of the exhaust port. An insert fills a volume in the exhaust port between the valve and the outside, thereby improving flow efficiency of the exhaust port.

REFERENCES:
patent: 4321893 (1982-03-01), Yamamoto
patent: 4333431 (1982-06-01), Ito et al.
patent: 4903647 (1990-02-01), Yamamoto et al.
patent: 4924819 (1990-05-01), Boyesen
patent: 5063888 (1991-11-01), Ozawa et al.
patent: 5190006 (1993-03-01), Motoyama et al.

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