Six Stroke Engine

SIX- STROKE ENGINESKarunesh Piwania

08107077

SIX - STROKE ENGINES

The six-stroke engine is a type of internal combustion engine based on the four-stroke engine, but with additional complexity to make it more efficient and reduce emissions. Two different types of six-stroke engine have been developed since the 1990s:

1. 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.

2. 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.

EXAMPLES OF THE TYPES OF ENGINES:

THOSE WHICH FOLLOW THE FIRST APPROACH:  Crower six-stroke engine  Bajulaz engine  Velozeta Six-stroke engine

THOSE WHICH FOLLOW SECOND APPROACH:  Beare Head M4+2 Piston charger engine.

CROWER’S SIX STROKE ENGINE

In a six-stroke engine developed in the U.S. by Bruce Crower, fresh water is injected into the cylinder after the exhaust stroke, 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.

VELOZETA SIX STROKE 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 which is removed during the sixth stroke.

BAZULAZ SIX STROKE ENGINE

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.

However, it differentiates itself entirely, due to its thermodynamic cycle and a modified cylinder head with two supplementary chambers: a combustion and an air heating chamber, both independent from the cylinder. Combustion, does not occur within the cylinder but in the supplementary combustion chamber, does not act immediately on the piston.

ENGINE DIAGRAM1. Intake valve2. Heating chamber valve3. Combustion chamber

valve4. Exhaust valve 5. Cylinder6. Combustion chamber 7. Air heating chamber 8. Wall of combustion

chamber9. Fuel injector10. Heater plug

SIX STROKE ENGINE EXPLANATION

During 1st and 2nd stroke, the air the combustion chamber (6) can receive injection of fuel and ignition is triggered.

1st stroke :Intake of pure air in cylinder(5).Valve (1) is open.

2nd stroke : Compression of pure air in the heating chamber(7) .Valve (2) is open.

During 3rd and 4th stroke the temperature of the pure compressed air in the heating chamber is raised sharply by heat exchange from combustion chamber.

3rd stroke: power stroke (work) .Release of combustion gases in the cylinder. Valve(3) is open.

4th stroke: exhaust of the combustion gases.Valve (4) is open.

5th stroke: Power stroke(work)Release of pure gas in the cylinder.

6th stroke: Recompression of pure into the combustion chamber.

M4+2 SIX STROKE ENGINE

The new conception of combustion engine is based on the combination of two engines. It makes use of both two-and four-stroke engine.

 Both The cylinders of modules of double engine pistons have been joined along one common axis with cylinder head - in the form of the ring. The pistons are moved with different speed and with appropriate stage displacement. There are two crankshafts, which are connected with special transmission. The four-stroke crankshaft is rotated with twice the speed of two-stroke crankshaft. 

PISTON CHARGER ENGINE In this engine, a "piston charger"

replaces the valve system. The piston charger charges the main cylinder and simultaneously regulates the inlet and the outlet aperture leading to no loss of air and fuel in the exhaust. 

In the main cylinder, combustion takes place every turn as in a two-stroke engine and lubrication as in a four-stroke engine.

Fuel injection can take place in the piston charger, in the gas transfer channel or in the combustion chamber.

ADVANTAGES Thermal efficiency reaching 50%. (30% for the actual

internal combustion engines) 

Fuel consumption reduced by more than 40%. 

Reduction of chemical, noise and thermal pollution. 

Two expansions (work) through six strokes. 

Direct injection and optimal fuel combustion at every engine speed. 

Multiple fuel, etc...

APPLICATIONS Motorboats (inboard and outboard engines) might

offer a big outlet for this type of engine. Their characteristics are perfectly suited to its use (economy, safety, simplification, and reduction in noise and pollution). Furthermore, the use of fuels other than gasoline would greatly reduce the risks of explosion.

Using non-fossil fuels of vegetable origin, natural gases and others, in simple, robust engine, operating with a minimum of adjustments and non-pollutant, would offer great advantages when provided for motor-pumps, generator sets, stationary engines, etc....intended for agriculture and industry.

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