ABSTRACT Modern world thrives on heat energy used in

different forms. Automobile industries is ever-growing industry. 95% of the automobile run on IC engines which are

powered by fossil fuels. Aim of thermal is to convert the heat energy to

mechanical energy. Efficiency of automobile is 30%. Paper describes the potential IC engine. To meet tomorrows challenges.

INTRODUCTION Otto cycle theoretically represents best option for an

IC engine cycle. Fuel energy is converted to heat at constant volume ,

when fluid is at maximum compression. Two technical modifications in 4-stroke to 6-stroke. Six stroke engines captures the wasted heat from the

4-stroke Otto cycle , creates steam and cools engine by providing free power stroke.

Developed by BRUCE CROWER and MALCOLM BEARE.

WORKING OF A 4-STROKE ENGINE

Fuel/air valves opens the piston moves down , which draws air and fuel into the chamber.

Valve closes as the piston moves back up , putting the air/fuel mixture under pressure.

Mixture is then ignited , causing a small explosion. Exhaust valves opens the piston moves back up once

again , pushing the by products of the fuel explosion out of the chamber. This leaves the piston back in its starting position ready for another cycle.

BRUCE CROWER’S 6-STROKE ENGINE

Four stroke engine after the exhaust stroke again the suction stroke take place.

Engine has some heat energy left in it , which is not utilized.

To cool, the engine radiator is used. The engine harnesses normally waste heat energy by

creating steam inside the combustion chamber. Engine runs on normal 4-stroke engine followed by

steam stroke and extra stroke.

BEARE DUAL OPPOSED PISTON 6-_STROKE ENGINE

6-stroke BEARE HEAD simply replaces the conventional 4- stroke engine cylinder head.

The BEARE HEAD utilizes an overhead short stroke Crank shaft and piston arrangement which open and closes inlet and exhaust ports leading through the upper cylinder liner.

The technology combines a 4-stroke engine bottom end with an opposite piston in the head working half the cylindrical rate of the bottom piston.

Head piston works in a ported cylinder closely resembling 2-stroke, thus 4+2=6.

Engine increases both torque and power output , better fuel economy , cleaner burning with reduced emissions.

Amount of power\torque generated by 35%.

WORKING After the exhaust cycles out of the chamber, rather than

squirting more fuel and air into the chamber, his design injects ordinary water. Inside the extremely hot chamber, the water immediately turns to steam– expanding to 1600 times its volume– which forces the piston down for a second power stroke. Another exhaust cycle pushes the steam out of the chamber, and then the six-stroke cycle begins again.

It appears to be quite innovative, despite the previous usage of water injection, which was to hold down combustion temperatures to avoid melting the engine. The WWII airplanes that used the water injection often used two stages of turbo charging, complete with an intercooler between the stages to limit the temperature rise.

WORKING OF BEARE DUAL OPPOSED PISTON 6-STROKE ENGINE○ Combustion chamber volume : 100 cc○ Main head:

Bore : 115 mmStroke : 96.3 mmSwept volume : 1000cc

○ Beare head: Bore : 75 mmStroke : 56.5 mmSwept volume : 250 cc

VOLUME-ANGLE 4-STROKE

 

FOR 6-STROKE

PRESSURE- VOLUME FOR OTTO CYCLE

PRESSURE-VOLUME FOR DUAL CYCLE

COMPARISON B\W 4 AND 6-STROKE

PERFORMANCE AND ECONOMY

Beare Head 6 Stroke Engine is thermodynamically more efficient, because the change in volume of the Beare Engine Power Stroke is greater than the intake, compression, & exhaust strokes.

The compression ratio of the Beare Dual Piston Engine can be greatly increased because of the absence of hot spots in the combustion chamber.

The Beare Engine’s rate of change in volume during the critical combustion period is less than in a conventional 4stroke.

The absence of valves within the combustion chamber allows greater Beare Engine design freedom.

A one-piece Beare Engine casting from crankshaft to upper shaft becomes feasible. No head gasket needed, cheaper to tool and produce.

ADVANTAGES

ADVANTAGES OF BEARE DUAL OPPOSED PISTON 6-STROKE ENGINE 

The net result is, Power/torque increases of 35% (conservative) Simpler and less expensive manufacturing and tooling. Reduction of cylinder head reciprocating parts. Lower maintenance costs due to less wearing parts

(Beare cylinder head) Longer service intervals possible due to lower operating

temperatures recorded.

CONCLUSION The world now thrives on fossil fuels, but it is an

exhaustible resource. We humans will surely move to an age where there will be no fossil fuel left for consumption and we must try to postpone it by using the available fossil fuel efficiently, so that we can prepare ourselves to face that era.

The two engines discussed in the above paper promises to use the available fossil fuel in an efficient manner. The engines may have some flaws in it which can be eliminated as time progresses. We are sure that these engines will rule the future.

REFERENCE

www.sixstroke.com Beare Technology Six stroke engine - Air-cooled

opposed-piston rotary- & reed-valve 90° V-twin. Accessed June 2007

Lyons, Pete. "Inside Bruce Crower’s Six-Stroke Engine", Auto Week, Feb 23, 2006. Retrieved on 2007-06-22.

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