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Six Stroke Engine

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Title: Six Stroke Engine


1
SIX STROKE ENGINES VELOZETA MODEL
2
Introduction
  • 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

3
History of six stroke engines
  • First Category
  • 1. Griffin six stroke engine
  • 2. Bajulaz six stroke engine
  • 3. Crower six stroke engine
  • 4. Velozeta six stroke engine
  • Second Category
  • 1. Beare head six stroke engine
  • 2. Charge pump engine

4
Velozetas six stroke engine
  • 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.

5
Engine parts modified
  • Camshaft / Crankshaft Sprockets-
  • Crankhas 1080 degrees of rotation for 360
    rotation of camshaft
  • Hence their corresponding sprockets are having
    teeth ratio 31
  • 34 teeth sprocket of camshaft in the four stroke
    is replaced by 42 teeth sprocket
  • 17 teeth crankshaft sprocket is replaced by 14
    teeth sprocket

6
  • 2.Cam lobes-
  • 360 degrees of cam has divided into 60 degrees
    among six strokes
  • Inlet valve is opened in the first stroke only
    and the exhaust valve, in the fourth, fifth and
    sixth strokes by the exhaust valve cam.
  • The exhaust valve cam is double lobed

7
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8
  • 3.Valve Timing-
  • IVO at 0 degree at TDC
  • IVC at 25 degree after BDC
  • EVO at 0 degree at BDC which was 25 degree
    before BDC in the original engine
  • EVC at 10 degree before TDC
  • Air inlet reed valve is opened in the fifth
    stroke and then for the sixth stroke exhaust
    valve is opened

9
  • 4.Secondary Air Induction System-
  • It supplies air which is used in the fifth and
    sixth stroke
  • During the fifth stroke air is sucked into the
    cylinder through a reed valve provided on the
    secondary air induction line
  • In the sixth stroke a second reed valve at the
    exhaust manifold opens and removes the mixture of
    air and unburned gases

10
Working of the engine
First stroke- During the first stroke the inlet
valve (6) opens and air-fuel mixture from
carburetor is sucked into the cylinder through
the inlet manifold (2).
11
  • Second stroke-
  • During the second stroke, piston moves from BDC
    to TDC, both the inlet valve (6) and exhaust
    valve (11) 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 91.
  • Third stroke-
  • During the third stroke, power is
    obtained from the engine by igniting the
    compressed air- fuel mixture using a spark plug
    (14). Both valves remain closed. Piston moves
    from TDC to BDC.

12
Fourth stroke- During the fourth stroke, the
exhaust valve (11) and the reed valve (23) 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 (11) remains open and the reed valve (23)
closes. Fresh air from the air filter (24) enters
the cylinder through the secondary air induction
line (21) provided at the exhaust manifold (13).
The reed valve (22) opens. Sixth stroke-
During the sixth stroke, the exhaust valve (11)
remains open. The air sucked into the cylinder
during the fifth stroke is removed to the
atmosphere through the exhaust manifold (13). The
reed valve (23) opens and the reed valve (22)
closes.
13
BAFFLES
14
Performance test results
1.Load Test Results-

15
2.Pollusion Test Results-
16
Graphs- B.P Vs TFC and SFC at 320 rpm
17
B.P Vs TFC and SFC at 320 rpm
18
Advantages
  • Reduction in fuel consumption
  • Reduction in pollution normally up to 65
  • Better scavenging and more extraction of work
    per cycle
  • Lower engine temperature - easy to maintain the
    optimum engine temperature level for better
    performance
  • The engine doest require any basic modification
    to the existing engines. All technological
    experience and production methods remain
    unaltered
  • Higher overall efficiency

19
Conclusion
  • The six stroke engine modification
    promises dramatic reduction of pollution and fuel
    consumption of an internal combustion engine. The
    fuel efficiency of the engine can be increased
    and also the valve timing can be effectively
    arranged to extract more work per cycle. Better
    scavenging is possible as air intake occurs
    during the fifth stroke and the exhaust during
    the sixth stroke. Due to more air intake, the
    cooling system is improved. It enables lower
    engine temperature and therefore increases in the
    overall efficiency.

20
THANK YOU
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