all about 6-stroke engine

1. PRESENTEDBY:
K.PRUTHVIRAJ
III-II MECHANICAL
12M91A0321

3. IMPORTANCE OF SIX STROKE ENGINE
 The six-stroke engine is a type of
internal combustion engine based on
the four-stroke engine, but with
additional complexity intended to make
it more efficient and reduce emissions.

4. APPROACHES FOR
SIX STROKE ENGINE DESIGN
 Two types of six-stroke engine have been
developed since the 1890s.

6. TYPES OF SIX STROKE ENGINES
1.1 Single piston designs
1.1.1 Griffin six-stroke engine
1.1.2 Bajulaz six-stroke engine
1.1.3 Velozeta six-stroke engine
1.1.4 NIYKADO Six Stroke Engine
1.1.5 Crower six-stroke engine
1.2 Opposed piston designs
1.2.1 M4+2
1.2.2 Beare Head
1.2.3 Piston charger engine

7. SINGLE PISTON DESIGNS
 These designs use a single piston per
cylinder, like a conventional two- or four-
stroke engine.
 A secondary, non-detonating fluid is
injected into the chamber, and the leftover
heat from combustion causes it to expand
for a second power stroke followed by a
second exhaust stroke.

8. 6-STROKE ENGINE

9. MODIFICATION IN 6-STROKE ENGINE
• ROTARY VALVE IS USED INSTEAD OF
POPPET VALVE.
• THREE VALVES ARE USED INSTEAD OF
TWO .
• TWO EXPANSION AND TWO EXHAUST
STROKES HAPPENS.

10. The Griffen’s engine at the Anson Engine Museum.

11. PRINCIPLE OF GRIFFEN SIMPLEX
 The key principle of the "Griffin Simplex" was a
heated exhaust-jacketed external vapouriser, into
which the fuel was sprayed.
 The temperature was held around 550 °F (288 °C),
sufficient to physically vapourise the oil but not to
break it down chemically.
 This fractional distillation supported the use of
heavy oil fuels, the unusable tars and asphalts
separating out in the vapouriser

12. WORKING OF 6-STROKE ENGINE

13. 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; the injection of fuel begins an
isochoric (constant-volume) burn which increases
the thermal efficiency compared to a burn in the
cylinder.

14. The six strokes of a single piston 6-stroke engine

15. Bajulaz six-stroke engine ( Continued )
 The high pressure achieved is then released into
the cylinder to work the power or expansion
stroke.
 Meanwhile a second chamber which blankets the
combustion chamber, has its air content heated to
a high degree by heat passing through the cylinder
wall.
 This heated and pressurized air is then used to
power an additional stroke of the piston.

16. CAM USED FOR 6-STROKE ENGINE

17. BEARE HEAD ENGINE
• The combination of compact design for the
combustion chamber together with no loss of air and
fuel is claimed to give the engine more torque, more
power and better fuel consumption.
 The benefit of fewer moving parts and design is
claimed to lead to lower manufacturing costs.
 Good for hybrid technology and stationary engines.
 The engine is claimed to be suited to alternative
fuels since there is no corrosion or deposits left on
valves.

18. The six strokes of BeareHead Engine
 Aspiration
 Pre-compression
 Gas transfer
 Compression
 Ignition and
 Ejection.

19. ADVANTAGES OVER 4-STROKE ENGINE

20. TORQUE-ANGLE DIAGRAM FOR 6-STROKE ENGINE

21.  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

22. ADVANTAGES(cont..,)
 Increased economy due to the Beare Head's ability to
operate and produce full operating power of much
higher AIR to FUEL ratios
 Reduction of exhaust emmissions due to less fuel being
consumed and the real prospect of meeting EURO-4
emmssions standards, doing away with the catalytic
convertor
 Possible one piece engine block and head casting,
saving more manufacturing costs
Usable torque at as low as idle means suitability for
lower RPM operation and adaptation to CVT
(Constantly Variable Transmission)

23. ADVANTAGES(cont..,)
 Reduction in fuel consumption by 40%.
 Adaptability to multi fuel operation.
 The Six Stroke is thermodynamically
more efficient because the change in
volume of the power stroke is greater
than the intake stroke and the
compression stroke.

24.  COMPLICATED DESIGN
 EXPENSIVE
 UNMANAGABLE IN TWO WHEELERS

25.  IN RACING CARS.
 IN HEAVY VEHICLES.
EARTH MOVING VEHICLES.

26. • Six stroke engine's adoption by the automobile
industry would have a tremendous impact on the
environment and world economy.
• Claimed benefits in a Beare Head Engine include a
9% increase in power, and improved thermodynamic
efficiency through an increased compression ratio
and expansion ratio.

28. THANK YOU
USED IN RACING VEHICLES.