six stroke engine deeply

1. MADE BY:-
ROBIN CHAUHAN

2. INTRODUCTION
TYPES OF SIX STROKE ENGINES
APPROACHES OF SIX STROKE ENGINE
ADVATAGES
DISADVANTAGES
CONCLUSION

3. • The six-stroke engine is a type
of internal combustion
engine based on the four-stroke
engine.
• First developed in early 1990’s
• More efficient & reduce emissions.

4.  Approaches for six stroke engine design
First approach
There is two additional strokes by the main piston as
fifth and sixth stroke
Second approach
It uses a second opposed piston which moves at half
the cyclical rate of the main piston

5. SIX STROKE
ENGINE
FIRST
APPROACH
Griffin six stroke
engine
Bajulaz six
stroke engine
Crower six
stroke engine
Velozeta six
stroke engine
SECOND
APPROACH
Beare head six
stroke engine
Charge pump
engine

6. The key principle
of the "Griffin
Simplex" was a
heated exhaust-
jacketed external
vapouriser, into
which the fuel was
sprayed.

7. Modifications to the cylinder head, with two
supplementary fixed capacity chambers:
a combustion chamber and an air preheating
chamber above each cylinder

8. Velozeta’s six-stroke engine
 First four strokes are same as a
conventional four stroke engine
 In the fifth stroke, air is sucked
in to the cylinder
 In the sixth stroke, a mixture of
air and unburned gases leaves out.

9. Working of the velozeta’s engine
First stroke:- During the
first stroke the inlet valve
opens and air-fuel mixture
from carburetor is sucked
into the cylinder through
the inlet manifold

10. Second stroke:-
During the second stroke, piston moves from BDC to TDC,
both the inlet valve and exhaust valve are closed and the air-fuel
mixture is compressed.
Third stroke:-
During the third stroke, power is obtained from the engine
by igniting the compressed air- fuel mixture using a spark plug.
Both valves remain closed. Piston moves from TDC to BDC.

11. Fourth stroke:-
During the fourth stroke, the exhaust valve and the reed valve
opens to remove the burned gases from the engine cylinder. Piston
moves from BDC to TDC.
Fifth stroke:-
During the fifth stroke, the exhaust valve remains open and the
reed valve closes. Fresh air from the air filter enters the cylinder
through the secondary air induction line provided at the exhaust
manifold. The reed valve opens.
Sixth stroke:-
During the sixth stroke, the exhaust valve remains open. The
air sucked into the cylinder during the fifth stroke is removed to the
atmosphere through the exhaust manifold. The reed valve opens and
the reed valve closes.

12. Crower six-stroke engine
Water is injected into the cylinder
after the exhaust stroke and is
instantly turned to steam, which
expands and forces the piston down
for an additional power stroke.

13. The technology combines a four stroke
engine bottom end with an opposed piston in
the cylinder head working at half the cyclical
rate of the bottom piston

14. WORKING PRINCIPLE OF BEARE
HEAD SIS STROKE ENGINE
FUEL IGNITES WITH
PISTON AT THE TOP
DEAD CENTER.

15. ROTARY VALVE
OPENS, ALLOWING
EXHAUST TO ESCAPE

16. EXHAUST
STROKE BEGINS
WHEN THE
PISTON IS AT
BOTTOM DEAD
CENTER

17. EXHAUST STROKE
ENDS, INTAKE
BEGINS. ROTARY
VALVE CUTS
EXHAUST .INTAKE
OF CHARGE INTO
CYLINDER DUE TO
PRESSURE
DIFFERENCE.

18. The intake stroke
happens when the
piston is on its
downward path with
the intake valve
open. This action
creates suction,
drawing atomized
fuel in this case
gasoline mixed with
air, into the
combustion
chamber.

19. TOP PISTON NEARLY
CLOSES COMPLETE
INLET PORT AND THE
COMPRESSION
BEGINS.

20. COMBUSTION
CHAMBER
COMPLETELY SEALED
AND READY FOR THE
COMBUSTION.

21. the power stroke begins
at a critical moment, just
as the air-fuel mixture is at
its most compressed. a
supercharged voltage is
delivered to the spark
plugs from the ignition coil,
at that point it ignites the
fuel mixture. the valves in
the engine are still closed
during this period. thus the
explosion forces the piston
down to turn the engine's
crankshaft, delivering the
power via the gearbox and
clutch to the driving
wheels.

22.  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 afour-stroke engine.
 Fuel injection can take place in the piston charger, in the gas
transfer channel or in the combustion chamber.
 It is also possible to charge two working cylinders with one
piston charger.

23. ADVANTAGES
Reduction in fuel consumption by at least 40%
Two expansions(work/Power stroke) in six strokes
Dramatic reduction in pollution ( up to 65%)
Higher overall efficiency
Lower engine temperature & noise level
Due to more air intake, the cooling system is improved
Better scavenging and more extraction of work per cycle
Less inertia due to lightness of moving parts

24. DISADVANTAGES
Brake power & indicated power per cycle per cylinder is
comparatively lesser
Engine size increases due to many number of cylinders &
additional components
Higher manufacturing cost of six stroke engine

25. CONCLUSION
Drastically reducing fuel consumption (by 40%) and
pollution (by 60-90%) without radically affecting
performances
It enables lower engine temperature and therefore increases
in the overall efficiency.