; Six Stroke Engine
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Six Stroke Engine

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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
 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
   Velozeta’s 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
 In the fifth stroke, air is sucked in to the cylinder
 In the sixth stroke, a mixture of air and unburned gases
leaves out.
   Engine parts modified
1. Camshaft / Crankshaft Sprockets:-
   Crankhas 1080 degrees of rotation for 360 rotation of
   Hence their corresponding sprockets are having teeth
    ratio 3:1
   34 teeth sprocket of camshaft in the four stroke is
    replaced by 42 teeth sprocket
   17 teeth crankshaft sprocket is replaced by 14 teeth
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
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
4.Secondary Air Induction System:-

   It supplies air which is used in the fifth and sixth
   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
     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).
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 9:1.

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.
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
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.
  Performance test results
1.Load Test Results:-
2.Pollusion Test Results:-
B.P Vs TFC and SFC at 320 rpm
B.P Vs TFC and SFC at 320 rpm
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
The engine does’t require any basic modification
to the existing engines. All technological experience
and production methods remain unaltered
Higher overall efficiency
              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

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