Six stroke engine

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A six stroke engine is an automobile engine in which the piston of the engine move up and down an additional time for each injection of fuel. The engine, developed from 2004 to 2006, appears to be more fuel efficient than a traditional four stroke engine.The currently famous six stroke engine designs include the Beare Head,Crower's six stroke engine,Bajulaz engine and the Six-stroke engine(Trivandru).

Contents

[edit] How it Works

[edit] “Beare Head”

The “Beare Head” known after its designer, uses a piston and ports very much like a two stroke engine to replace the over head valve system that is found in four stroke engines today. The four stroke block, pistons and crankshaft remain unaltered. This combination of two stroke and four stroke technology has given the engine its name – the “six stroke engine” (2 + 4 = 6). Below the cylinder head gasket everything is the same – but cylinder head and poppet valves get thrown away. To replace the camshaft and the valves the cam drive belt has been retained and fitted with an ultra short stroke upper crankshaft complete with piston, which the belt drives at half the engine speed just as it previously drove the cam. This piston drives up and down in a sleeve, past inlet-exhaust ports set into the cylinder wall, opening guided by a rotary disk valve. This technology is owned by an Australian company, Jack Brabham Engines Limited.

[edit] “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.

[edit] “Six-stroke engine (Trivandru)”

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 which 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.

[edit] “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.[1]

This design also claims to reduce fuel consumption by 40%.

[edit] The Inventors

Bajulaz Six Stroke Engine
Bajulaz S A , Switzerland.

Crower's Six Stroke Engine
The 75 year old inventor - Bruce Crower is the person behind this hybrid cycle six stroke engine

Trivandrum, India team
The Team includes Aaron Joseph George, Arun K Nair, Boby Sebastian and Krishnaraj U. It took them almost two years to develop the engine. A four-stroke Honda engine was experimentally altered to build the new one.Former Honda chief technician Anil CC assisted the project.The ideas regarding the modification was first suggested and practically implemented by Anil.The engineering students formulated the theories and helped develop the enginering aspects of the IC engine.

[edit] In the News

[edit] Advantages of Six Stroke Engine

Bajulaz six stroke engine

  • Reduction in fuel consumption by at least 40%
  • Two expansions (work) in six strokes
  • Multifuel
  • Dramatic reduction in pollution
  • Liquefied Petroleum Gas
  • Cost comparable to those of a four-stroke engine

Six-stroke engine (Trivandru)

  • Reduction in fuel consumption
  • Dramatic reduction in pollution
  • Better scavenging and more extraction of work per cycle
  • Lower engine temperature - so , easy to maintain the optimum engine temperature level for better performance
  • Less friction – so , less wear and tear
  • The six-stroke engine does not require any basic modification to the existing engines. All technological experience and production methods remain unaltered.

Crower's six stroke engine

  • No cooling system required
  • Improve a typical engine’s fuel consumption

[edit] Patent

Chanayil Cleetus Anil holds a patent on the design involving air injection into the pistons. (Ref)

Bruce Crower holds a patent on the design involving fresh water injection into the pistons. ([2])

Jack Brabham Engines Limited has various patents on the "Beare Head" in a range of countries.

[edit] Awards

The Engineering students have been awarded the 'Indian Society for Technical Education - National awarded' for Best B.Tech project 2006. (ISTE/BBSBEC-B.Tech./Award/2006)Ref


[edit] External links & References

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