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Maharishi Markandeshwar UniversityDepartment of Mechanical Engineering
A Technical Seminar Presentation On
Presented By
Vikash GuliaRoll No: 11092350
8th Semester
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CONTENTS
Introduction
Concept of Six stroke engine
Dual fuel Six stroke engine
Specifications
Comparison
Features
Performance and economyConclusion
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INTRODUCTION
A six stroke engine derived its namefrom the fact that it is a mixture of two
and four stroke engine.
This engine is a radical hybridizationof two and four stroke engine that the
top portion of two stroke engine and
the bottom rather the middle section ofa four stroke engine.
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CONCEPT OF SIX STROKE
ENGINEThis technology is also known as
Beare Technology.
This engine got its name due to its
construction.This engine is a radical hybridization
of two and four stroke engines.
These types of engines have manyadvantages compared to OHC fourstroke engines.
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SIX STROKE ENGINE
1. Intake valve
2. Heating chamber valve
3. Combustion chamber valve
4. Exhaust valve5. Cylinder
6. Combustion chamber
7. Air heating chamber
8. Wall of combustion chamber
9. Fuel injector
10.Heater plug
STROKE 1Intake of pure air in thecylinder
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STROKE 2 STROKE 3
Compression of pure air in
heating chamber
Release of combustion
gases in the cylinder
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STROKE 4 STROKE 5
Release of pure air
into cylinder
Recompression of pure air
in the combustion chamber
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STROKE 6
Exhaust of combustion gases
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DUAL FUEL SIX STROKE
ENGINE
This engine runs by two fuels i.e. diesel (primary fuel) and
methanol (secondary fuel)
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SPECIFICATIONS
Table 1. Specifications of the test engine:
Four stoke Six stroke
Diesel Engine Diesel Engine
Engine type DI, Single cylinder, Air cooled, OHV
Bore x Stroke [mm] 82 x 78
Displacement [cc] 412
Top Clearance [mm] 0.9
Cavity Volume [cc] 16
Compression ratio 21
Intake Valve Open 100
BTDC 70
BTDC
Intake valve Close 1400
BTDC 1450
BTDC
Exhaust Valve Open 1350
ATDC 1400
ATDCExhaust Valve Close 12
0ATDC 3
0ATDC
Valve Overlap 220
100
Rated power 5.9 kW /3000rpm
Base Engine ----------------
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COMPARISONSComparison between four stroke & six stroke diesel engines
Engine Parameters
Four Stroke
Diesel Engine
Six Stroke
Diesel Engine
Engine Speed Ne [rpm] 2007 2016
Supplied combustion heat per cycle
Qt [KJ/cycle] 0.50 0.68
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
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ADVANTAGES
Reduction in fuel consumption by at least 40%
Two expansions(work/Power stroke) in six strokes
Dramatic reduction in pollution ( up to 65%)
Higheroverall efficiency
Lowerengine 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
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DISADVANTAGES
Brake power & indicated powerper cycle per
cylinder is comparatively lesser
Engine size increases due to many number of
cylinders & additional components
Higher manufacturing cost of six stroke engine
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APPLICATIONS
Automobiles, heavy goods, construction-site and
farm vehicles.
Motor-pumps, generator sets, stationary engines,
etc....intended for agriculture and industry.
Motorboats
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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.
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