2. 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.

3. 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.

5. 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.

6. 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.

7. 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 powertorque generated by 35%.

9. 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.

10. WORKING OF BEARE DUAL OPPOSED
PISTON 6-STROKE ENGINE
○ Combustion chamber volume : 100 cc
○ Main head:
Bore : 115 mm
Stroke : 96.3 mm
Swept volume : 1000cc
○ Beare head:
 Bore : 75 mm
Stroke : 56.5 mm
Swept volume : 250 cc

11. VOLUME-ANGLE 4-STROKE

12. FOR 6-STROKE

13. PRESSURE- VOLUME FOR OTTO
CYCLE

14. PRESSURE-VOLUME FOR DUAL
CYCLE

15. COMPARISON BW 4 AND 6-STROKE

16. 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.

17. 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.

18. 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.

19. 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.

20. QUERIES