Six Stroke Engine
The six stroke engine has
2 power strokes, one fuel, one steam or air. The currently notable six
stroke engine designs include Crower's six stroke engine, the Bajulaz
engine and the Six-stroke engine (Trivandrum).
The Beare Head engine is called a six stroke by its designer but stands
apart from the others. It uses a second opposed piston in each cylinder
which moves at half the cyclical rate of the main piston, thus giving
six piston movements per cycle. It does not use any additional working
fluid.
Six Stroke Engine types
"Bajulaz six stroke engine"
The Bajulaz six stroke engine is similar to a regular combustion engine
in design. There are however modifications to the cylinder head, with
two supplementary fixed capacity chambers , a combustion chamber and
an air preheating chamber above each cylinder. The combustion chamber
receives a charge of heated air from the cylinder and the injection
of fuel begins an isochoric burn which has increased thermal efficiency
compared to a burn in the cylinder. The high pressure achieved is then
released into the cylinder to work the power stroke. Meanwhile a second
chamber which blankets the combustion chamber has had its air contents
heated to a high degree by heat passing through the walls from the burn.
This heated and pressurized air is then used to power another stroke
of the piston in the cylinder. The advantages of the engine include
reduction in fuel consumption by at least 40%, two expansion strokes
(work) in six strokes, multi-fuel usage capability, and a dramatic reduction
in pollution.
The Bajulaz six stroke
engine features:
Reduction in fuel consumption by at least 40%
Two expansions (work) in six strokes
Multifuel
Dramatic reduction in pollution
Liquefied Petroleum Gas
Costs comparable to those of a four-stroke engine
This six-stroke engine was developed by the students of College of Engineering,
Trivandrum, India, from a modified four-stroke Honda engine. 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 a variety of fuels, ranging from petrol and diesel to LPG. An
altered engine shows a 65% reduction in CO pollution when compared with
the four stroke engine from which it was developed.
Its features are:
Reduction in fuel consumption
Dramatic reduction in pollution
Better scavenging and more extraction of work per cycle
Lower working temperature makes it easy to maintain 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 six stroke
In the six-stroke engine patented in the U.S. by Bruce Crower, after
the exhaust stroke, fresh water is injected into the cylinder, 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%.
It was invented in 2004 by 75 year old American inventor Bruce Crower
who holds a patent on the design involving fresh water injection into
the cylinders. Crower's six stroke engine features:
No cooling system required
Improves a typical engine’s fuel consumption
Requires a supply of distilled water to act as the medium for the second
power stroke.
"Beare Head'"
The term "Six Stroke" was coined by the inventor of the Beare Head,
Malcolm Beare and sold to Jack Brabham Engines Limited in May 2004.
The technology combines a four stroke engine bottom end with an opposed
piston in the head working at half the cyclical rate of the bottom piston.
The head piston works in a ported cylinder closely resembling that of
a two stroke, thus 4+2= Six Stroke.
|
