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Six-stroke engine
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The six-stroke engine is a type of internal combustion engine based on the four-stroke engine, but with additional complexity intended to make it more efficient and reduce emissions. Two types of six-stroke engine have been developed since the 1890s:
In the first approach, the engine captures the heat lost from the four-stroke Otto cycle or Diesel cycle and uses it to power an additional power and exhaust stroke of the piston in the same cylinder. Designs use either steam or air as the working fluid for the additional power stroke.[1] The pistons in this type of six-stroke engine go up and down three times for each injection of fuel. There are two power strokes: one with fuel, the other with steam or air. The currently notable designs in this class are the Crower six-stroke engine, invented by Bruce Crower of the U.S.; the Bajulaz engine by the Bajulaz S.A. company of Switzerland; the Velozeta Six-stroke engine built by the College of Engineering, at Trivandrum in India; and the NIYKADO Six Stroke Engine invented by Chanayil Cleetus Anil, NIYKADO Motors, India under patent number IN252642 granted on 25 May 2012.
The second approach to the six-stroke engine uses a second opposed piston in each cylinder that moves at half the cyclical rate of the main piston, thus giving six piston movements per cycle. Functionally, the second piston replaces the valve mechanism of a conventional engine but also increases the compression ratio. The currently notable designs in this class include two designs developed independently: the Beare Head engine, invented by Australian Malcolm Beare, and the German Charge pump, invented by Helmut Kottmann.
Contents
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1 Engine types
1.1 Single piston designs
1.1.1 Griffin six-stroke engine
1.1.2 Bajulaz six-stroke engine
1.1.3 Velozeta six-stroke engine
1.1.4 NIYKADO Six Stroke Engine
1.1.5 Crower six-stroke engine
1.2 Opposed piston

References: Related U.S. patents[edit] 1217788 Internal combustion and steam engine Feb 27, 1917 1339176 Internal combustion engine May 4, 1920. Leonard H. Dyer invented the first 6-stroke internal combustion/water-injection engine in 1915. 3964263 Six cycle combustion and fluid vaporization engine Jun 22, 1976 4143518 Internal combustion and steam engine Mar 13, 1979 4301655 Combination internal combustion and steam engine Nov 24, 1981 4433548 Combination internal combustion and steam engine Feb 28, 1984 4489558 Compound internal combustion engine and method for its use Dec 25, 1984 4489560 Compound internal combustion engine and method for its use Dec 25, 1984 4736715 Engine with a six-stroke cycle, variable compression ratio, and constant stroke Apr 12, 1988 4917054 Six-stroke internal combustion engine Apr 17, 1990 4924823 Six-stroke internal combustion engine May 15, 1990 6253745 Multiple stroke engine having fuel and vapor charges Jul 3, 2001 6311651 Computer-controlled six-stroke internal combustion engine and its method of operation Nov 6, 2001 6571749 Computer-controlled six-stroke cycle internal combustion engine and its method of operation Jun 3, 2003 7021272 Computer controlled multi-stroke cycle power generating assembly and method of operation Apr 4, 2006