seminar six-stroke-engine-presenation (1).ppt

Six stroke engine

1. SIX STROKE SIX STROKE
ENGINE ENGINE
BY-Rahull RajjBY-Rahull Rajj
-Nalin Kumar -Nalin Kumar

2. CONTENTS
Introduction
How six stroke engine works
Working principles
Specification of six stroke engine
Comparison of six stroke engine with four
stroke engine
Graphs
Thermodynamic advantages
Conclusion

3. Two different approaches of six stroke engines

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

4. Introduction
1
st
approach
Malcolm beare built an innovative hybrid design of the I C
engine , by combining a two stroke with a four stroke engine.
The Beare Head is a new type of four stroke engine head
design known as the “Beare Head”
 The Beare Head uses a piston and ports very much like a two
stroke engine to replace the over head valve system that is
found in four stroke engines today. The four stroke block,
pistons and crankshaft remain unaltered. This combination of
two stroke and four stroke technology has given the engine its
name – the “six stroke engine” (2 + 4 = 6).

5. Key attributes of the Beare Head
are:
 Increased power,
 Increased torque,
 Fewer, lighter reciprocating parts,
 Simpler manufacture.

6. Velozeta’s six stroke engine
2
nd
approach
 A four stroke Honda engine is altered to form the 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.

8. HOW SIX STROKE ENGINE
WORKS

9. Working of the 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
. 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. The
compression ratio of the modified engine is
same as that of the original four stroke Honda
engine 9:1.

10. 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.
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.

11. 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. SPECIFICATION OF SIX STROKE
ENGINE
PROTOTYPE 5 - DUCATI BASED

13. Comparison Of Six Stroke Engine
With Four Stroke Engine

15. 1. In a six stroke engine the energy absorption is less because
of slower acceleration of reciprocating parts.
2. It reduces the weight and complexity of the engines head by
as much as 50%. Instead of using energy to drive the head.
3.Torque is increased by 35% and efficiency increased by
the same.
4.Increased torque and power output.

19. Pollusion Test Results:-

20. Thermodynamic advantages
 The change in volume during the compression stroke
is slightly greater than a 4 stroke .
The expansion stroke is much greater than a 4 stroke,
both from to B.D.C. and from T.D.C.
. Hence the 6 stroke system is better from a
thermodynamic point of view because more energy is
extracted from the expansion process

21. Advantages
Better scavenging and more extraction of work
per cycle
Reduction in fuel consumption
Lower engine temperature - easy to maintain
the optimum engine temperature level for better
performance
Reduction in pollution normally up to 65%
The engine does’t require any basic
modification to the existing engines. All
technological experience and production
methods remain unaltered
Higher overall efficiency

22. Conclusion
 In a six stroke engine the energy absorption is less
because of slower acceleration of reciprocating parts The
piston speed of the upper piston is about a quarter of the
main piston; therefore its service life should be at least
twice that of the main piston.
 In the Beare design, per single cylinder, the number of
parts is 15 compared to a four stroke of approx 40 to 50
parts. Also, to reduce manufacturing costs the head and
block can be machined in o
­ne piece.

23. The bottom piston is a standard design and the Beare
Head bolts directly o
­nto the engine block, replacing the
overhead valves and standard head.
It reduces the weight and complexity of the engines head
by as much as 50%. Instead of using energy to drive the
head, the head actually develops energy for conversion
to power back through the timing chains of an engine.
Torque is increased by 35% and efficiency increased by
the same. This can be achieved by simply unbolting an
existing head of a four-stroke engine and then bolting on
a Beare Head.

24. Increased torque and power output,
 
Better fuel economy and cleaner burning longer service
intervals and considerably reduced tooling costs when
compared with a conventional four-stroke design.

25. THANK YOU