1. SIX STROKE DIESEL ENGINE
Department of Mechanical Engineering
A Seminar Presentation On
SIX STROKE DIESEL ENGINE

2. CONTENTS Introduction Types of Six stroke engines
Bajulaz Six stroke Diesel engine
Dual fuel Six stroke engine
Comparison
Specifications
Features
Performance and economy
Conclusion

3. INTRODUCTION
The six-stroke engine is a type of internal combustion engine based on the four-stroke engine.
First developed in early 1990’s
Advancement is the Duel fuel six stroke diesel engine
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. Bajulaz six stroke engine
TYPES:
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. BAJULAZ SIX STROKE ENGINE
Intake valve
Heating chamber valve
Combustion chamber valve
Exhaust valve
Cylinder
Combustion chamber
Air heating chamber
Wall of combustion chamber
Fuel injector
Heater plug
Intake of pure air in the
cylinder
STROKE 1

7. STROKE 2 STROKE 3 Compression of pure air in heating chamber
Release of combustion
gases in the cylinder

8. STROKE 4 STROKE 5 Recompression of pure air in the combustion chamber
Release of pure air
into cylinder

9. STROKE 6
Exhaust of combustion gases

10. DUAL FUEL SIX STROKE ENGINE
This engine runs by two fuels i.e. diesel (primary fuel) and methanol (secondary fuel)

11. PV DIAGRAMS

12. SPECIFICATIONS

13. COMPARISONS Comparison between four stroke & six stroke diesel engines
Engine Parameters
Four Stroke
Diesel Engine
Six Stroke
Engine Speed Ne [rpm]
2007
2016
Supplied combustion heat per cycle
Qt [KJ/cycle]
0.50
0.68
Supplied combustion heat per unit time Ht [KJ/s]
8.36
7.62
Intake air flow per cycle
Ma [mg/cycle]
358.7
371.4
Injection quantity per cycle
Mf [mg/cycle]
11.8 16
Excess air ratio λ
2.40
1.83
Intake air flow per unit time
Ma [g/cycle]
6.00
4.16
Injection quantity per unit time
Mf [g/sec]
0.197
0.179
Brake torque Tb [N-m]
15.52
15.28
Brake power Lb [KW]
3.26
3.24
BSFC. b [ g / KW-h]
217.9
520.3
IMEP Pi [Kgf / cm2]
5.94
4.37
Indicated torque Ti [N-m]
19.10
18.71
Indicated power Li [KW]
4.01
3.75
ISFC bi [g / KW-h ]
177.2
163.3

14. Diesel Fuel Six Stroke Diesel Engine
Comparison between six stroke diesel & dual fuel six stroke engines
Diesel Fuel Six Stroke Diesel Engine
Dual Fuel Six Stroke
Diesel Engine
Engine Speed Ne [rpm]
2016
2006
Supplied combustion heat per cycle
Qt [kJ/cycle]
0.68
Injection quantity per cycle
(First Combustion Stroke)
Mf1 [mg/cycle]
8.0
(Diesel Fuel)
(Second Combustion Stroke)
Mf2 [mg/cycle]
17.2
(Methanol)
Excess air ratio λ
1.86
1.93
Brake torque Tb [N-m]
6.18
6.08
Brake power Lb [kW]
1.52
1.5
B.S.F.C. b [ g / kW.h]
504.0
777.7
I.M.E.P. Pi [kgf / cm2]
4.56
4.75
Indicated torque Ti [N-m]
21.68
20.38
Indicated power Li [kW]
3.45
2.98
I.S.F.C. bi [g / kW.h ]
155.5
236.2
Indicated specific heat consumption
bi’ [MJ /kW.h]
6.61
6.37

15. Lower maintenance costs due to less wearing parts (cylinder head)
Longer service intervals possible due to lower operating temperatures recorded
Increase in thermal efficiency by more than 20%
Reduced fuel consumption

16. IMPROVEMENTS IN EXHAUST
Four Stroke Diesel Engine
Six Stroke Diesel Engine
Dual Fuel Six Stroke Engine
Nitrous Oxide [ppm]
( % improvement)
768
113
(85.3%)
90.5
(88.2%)
Soot [%]
(%improvement)
6.8
28.8
( %)
(100%)
Indicated specific heat consumption bi’ [MJ/KW-h]
(% improvement)
7.51
6.61
(12.0%)
6.37
(15.2%)

17. 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

18. 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

19. APPLICATIONS
Automobiles, heavy goods, construction-site and farm vehicles. 
motor-pumps, generator sets, stationary engines, etc....intended for agriculture and industry.
Motorboats

20. CONCLUSION
Drastically reducing fuel consumption (by 40%) and pollution (by 60-90%) without radically affecting performances
For the dual fuel six-stroke engine, soot & nitrous oxide was practically eliminated by a small amount of methanol in the second combustion process.
It enables lower engine temperature and therefore increases in the overall efficiency.

21. THANK YOU