Introduction: The majority of the actual internal combustion engines, operating on different cycles have one common feature, combustion occurring in the cylinder after each compression, resulting in gas expansion that acts directly on the piston (work) and limited to 180 degrees of crankshaft angel. According to its mechanical design, the six- stroke engine with external and internal combustion and double flow is similar to the actual internal reciprocating combustion engine.
In the time where the cost of energy keeps rising, and the energy sources are being exhausted, the world has to realise that it has to be very conscious about the use of the energy sources which are left. Much research is done on alternative and renewable energy sources like windmills and tidecenters, while people are still spilling with the main energy source of the moment; oil.
For the moment in an internal combustion engine, most of the fuel’s energy is lost into heat. This heat is vented by the radiator, or in the best case used to heat up the internal car at an efficiency of (in the best case) 42% while a major part of the energy is lost. Therefore one has to focus on the gain of energy by using this heat.
Types of six stroke engine: a)“Bajulaz six stroke engine” b)“Six-stroke engine (Trivandrum)” c)“Crower's six stroke engine”
Bajulaz six stroke engine: The Bajulaz six stroke engine is similar to an actual IC engine in design. The modification goes in the cylinder head for which two supplementary chambers – a combustion chamber and an air preheating chamber have been provided. The combustion occurs in a totally enclosed chamber (isochoric), thereby increasing the thermal efficiency. The advantages include reduction in fuel consumption by at least 40%; two expansion strokes (work) in six strokes, Multi-fuel usage and dramatic reduction in pollution.
Six-stroke engine (Trivandrum) In the six-stroke engine developed by the students of College of Engineering, Trivandrum, India, the first four strokes are the same as a four stroke internal combustion engine. After the exhaust stroke, instead of air/fuel mixture (as in case of petrol engines) fresh air is sucked into the cylinder from the air filter, and is removed during the sixth stroke.The valve overlaps have been removed and the additional two strokes have been provided for better scavenging, using air injection.The engine shows 40% reduction in fuel consumption and dramatic reduction in pollution. Its specific power is not less than that of a four- stroke petrol engine. The engine can run on almost any fuel, petrol and diesel to LPG. An altered engine shows a 65% reduction in CO pollution when compared with the four stroke engine that was used to develop the Six-Stroke Engine.
Crower's six stroke engine: In the six-stroke engine patented in the U.S. by Bruce Crower, after the exhaust stroke, fresh water is injected into the piston, and is quickly turned to superheated steam, which causes the water to expand to 1600 times its volume and forces the piston down for an additional stroke. This design also claims to reduce fuel consumption by 40%.
Engine parts modified : Camshaft / Crankshaft Sprockets:- Crankhas 1080 degrees of rotation for 360 rotation of camshaft Hence their corresponding sprockets are having teeth ratio 3:1 34 teeth sprocket of camshaft in the four stroke is replaced by 42 teeth sprocket 17 teeth crankshaft sprocket is replaced by 14 teeth sprocket
16. Piston 17. Connecting rod 18. Timing Chain 19. Sprocket 14T 20. Crank 21. Secondary air induction unit 22. Reed valve (One way valve) 23. Reed valve (One way valve in Exhaust manifold) 24. Air filter 25. 42T sprocket holder 26. Bearing
IVO at 0 degree at TDC IVC at 25 degree after BDC EVO at 0 degree at BDC which was 25 degree before BDC in the original engine EVC at 10 degree before TDC Air inlet reed valve is opened in the fifth stroke and then for the sixth stroke exhaust valve is opened
Reduction in fuel consumption by at least 40% Two expansions (work) in six strokes Reduction in pollution Reduction in fuel consumption Less friction – so, less wear and tear No cooling system required Improve a typical engine’s fuel consumption Advantages of Six Stroke Engine
The six stroke engine modification promises dramatic reduction of pollution and fuel consumption of an internal combustion engine. The fuel efficiency of the engine can be increased and also the valve timing can be effectively arranged to extract more work per cycle. Better scavenging is possible as air intake occurs during the fifth stroke and the exhaust during the sixth stroke. Due to more air intake, the cooling system is improved. It enables lower engine temperature and therefore increases in the overall efficiency.