The Beare-head engine
internal combustion engine
An internal combustion engine (ICE or IC engine) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal comb ...
technology combines a
four-stroke
A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...
engine bottom end and piston, with a ported
cylinder head closely resembling that of a
two-stroke
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft in contrast to a four-stroke engine which re ...
engine. The head piston is smaller and moves at half cycling of the bottom piston. Functionally, the cylinder-head piston replaces part of the valve mechanism of a conventional four-stroke engine, and protects the remainder from the higher pressures. This configuration has been described as a
six-stroke engine
A six-stroke engine is one of several alternative internal combustion engine designs that attempt to improve on traditional two-stroke and four-stroke engines. Claimed advantages may include increased fuel efficiency, reduced mechanical complexit ...
based on adding together the four strokes per cycle of the bottom piston and the two strokes of the cylinder head piston, but there are essentially only 4 strokes, just with an alternative form of valving.
References
*
External links
www.six-stroke.com* Australian Federal Court judgment — .
* Costs judgment — {{cite AustLII, FCA, 1096, 2010, litigants=Jack Brabham Engines Limited v Beare , courtname=auto.
Internal combustion engine