Six Stroke Engine

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SIX STROKE ENGINES VELOZETA MODEL
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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

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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

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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.

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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

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• 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

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• 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

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• 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

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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).
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• 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.

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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.
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BAFFLES
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Performance test results
1.Load Test Results-

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2.Pollusion Test Results-
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Graphs- B.P Vs TFC and SFC at 320 rpm
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B.P Vs TFC and SFC at 320 rpm
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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

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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.

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THANK YOU