Exhaust controller for spark ignition type two stroke internal c

Details Exhaust controller for spark ignition type two stroke internal c Exhaust controller for spark ignition type two stroke internal c

1997-07-02

1998-11-03

McMahon, Marguerite

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

F02D 1302, F02B 2520, F02B 900, F02B 1100

Patent

active

058293949

ABSTRACT:
An exhaust controller for a spark ignition type two stroke internal combustion engine capable of adjusting an exhaust timing by an exhaust control valve, characterized by sufficiently cooling an outer peripheral wall of an exhaust passage. In a spark ignition type two stroke internal combustion engine, a cylinder head side outer peripheral portion of an upstream portion of an exhaust passage smoothly connected to an exhaust port is formed of an exhaust passage forming portion of a lid member closing an exhaust control valve. A crank case side outer peripheral portion of the exhaust passage is formed of a cylinder block. The cylinder head side outer peripheral portion of the exhaust passage is cooled by a cooling water passage near a cylinder head which is formed in the lid member and the crank case side outer peripheral portion of the exhaust passage is directly cooled by a cylinder block cooling water passage near a crank case which is formed in the cylinder block.

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