The Bourke engine was designed by Russell Bourke in the late 1930s, who endeavored to improve upon the Otto cycle engine. Despite finishing his redesign and building several working engines; bad luck (WWII breaking out), bad health and a know-best attitude compounded to prevent his engine from ever coming to market despite its claimed advantages. Well into the 2000's there are several small groups extolling the virtues of the design. The Bourke engine has two opposed cylinders with the pistons in a Scotch yoke mechanism. Because the motion of the pistons is a perfect sine wave with regards to time vs displacement the fuel burns in a smaller volume, and so burns hotter. The Bourke engine also has a looser coupling with the output shaft, preventing excess vibration. The intake valves are replaced by ports, saving on parts. This article or section is missing references or citation of sources. ... The four-stroke cycle of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today ( cars and trucks, generators, etc). ... German soldiers at the Battle of Stalingrad World War II was the most extensive and costly armed conflict in the history of the world, involving the great majority of the worlds nations, being fought simultaneously in several major theatres, and costing tens of millions of lives. ... The Scotch Yoke is a mechanism for converting the horizontal motion of a slider into rotational motion or vice-versa. ...
Unfortunately the design features that increase its efficiency create emission problems. The higher combustion temperatures combined with the increased cycle time around top-dead-center lead to increased nitrogen oxide emissions. This more than anything else has stopped the Bourke engine from gaining widespread acceptance today. The term nitrogen oxide is imprecise and can be used to refer to any of these oxides (oxygen compounds) of nitrogen, or to a mixture of them: Nitric oxide (NO), nitrogen(II) oxide Nitrogen dioxide (NO2) Dinitrogen monoxide (N2O) (Nitrous oxide) Dinitrogen trioxide (N2O3) Dinitrogen tetroxide (N2O4) Dinitrogen pentoxide (N2O5...
Design features
Scotch yoke instead of connecting rods to translate motion to rotary motion.
Fewer moving parts.
Smoother operation.
Longer percentage of cycle spent at top-dead-center and bottom-dead-center for more complete combustion and exhaust scavanging.
Two power strokes for every rotation from the opposed pistons instead of one every other rotation (4-stroke) resulting in nearly twice the power at a given engine speed.
High compression and temperatures to cause an instantaneous and adiabatic reaction as opposed to a drawn out combustion.
Lean fuel/air misture combined with the adiabatic reaction resulting in zero unburnt hydrocarbons in the exhaust.
Sealed underside of the piston to isolate the fuel/air mixture from the crankcase.
Eliminate the need to mix oil with the fuel as with standard 2-cycle engines
Prevents the piston ring blow by from polluting the crankcase oil extending the life of the oil.
The four-stroke (4 Stroke) cycle of an internal combustion engine is the cycle most commonly used for automotive and industrial purposes today (cars and trucks, generators, etc). ... This article covers adiabatic processes in thermodynamics. ... Piston ring A piston ring is an open-ended ring that fits into a groove on the outer diameter of the piston. ...
Bourke may be to engines what Tesla is to radiant energy -- a scientist who did not realize the actuation of his revolutionary technology in his day, but whose technology may be the salvation of the 21st century energy needs.
The Bourkeengine can easily, and perhaps even optimally, run on hydrogen (which can be produced from water), as well as Biodiesel or other less clean but renewable fuels such as methane from garbage.
Engine and fuel engineering - The BourkeEngine (http://www.eng-tips.com/viewthread.cfm?qid=98313)
The internal combustion engine is a heat engine in which the burning of a fuel occurs in a confined space called a combustion chamber.
Engines based on the four-stroke cycle or Otto cycle have one power stroke for every four strokes (up-down-up-down) and are used in cars, larger boats and many light aircraft.
An engine's capacity is the displacement or swept volume by the pistons of the engine.
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