Four-stroke engine

Details Four-stroke engine Four-stroke engine

2004-06-02

2008-05-06

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Cooling

Air-cooled

Reexamination Certificate

active

07367293

ABSTRACT:
A four-stroke engine includes a cylinder block, a cylinder head mounted on the cylinder block, multiple cooling fins formed on the cylinder block and the cylinder head, a combustion chamber and an intake port and exhaust port formed in the cylinder head and in communication with the combustion chamber. A cooling jacket is formed in the cylinder head only between a virtual object generated by the intake port or exhaust port being rotated about a cylinder axis. A mating surface of the cylinder head on the cylinder block.

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patent: 2002/0029752 (2002-03-01), Laimbock
patent: 06-96975 (1994-11-01), None
patent: 2649179 (1997-05-01), None

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