55-eldhose paul-six stroke engine
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SIX STROKE ENGINES
VELOZETA MODEL
Presented By,
ELDHOSE PAUL
Reg.No.45258
Roll No:55
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IntroductionTwo 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 engine2. 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 strokeengine
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
1. Camshaft / Crankshaft Sprockets:-
Crankhas 1080 degrees of rotation for 360 rotation of
camshaft
Hence their corresponding sprockets are having teeth
ratio 3:1
34 teeth sprocket of camshaft in the four stroke isreplaced 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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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 theexhaust manifold opens and removes the mixture of
air and unburned gases
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Working of the engineFirst stroke:- During the first stroke the inlet valve (6) opensand 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 iscompressed. 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.
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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.PVs TFC andSFC at 320 rpm
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B.PVs TFC andSFC at 320 rpm
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AdvantagesReduction in fuel consumptionReduction in pollution normally up to 65%Better scavenging and more extraction of workper cycleLower engine temperature - easy to maintain theoptimum engine temperature level for betterperformance
The engine doest require any basic modification tothe existing engines. All technological experienceand production methods remain unalteredHigher overall efficiency
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ConclusionThe six stroke engine modification promises
dramatic reduction of pollution and fuel consumption of aninternal combustion engine. The fuel efficiency of the
engine can be increased and also the valve timing can beeffectively arranged to extract more work per cycle. Betterscavenging is possible as air intake occurs during the fifthstroke and the exhaust during the sixth stroke. Due to moreair intake, the cooling system is improved.It enables lowerengine temperature and therefore increases in the overall
efficiency.
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References
file:///H:/abc/BEARE-Six%20Stroke%20Engine/Theory%20of%20Six%20S
troke%20Internal%20Combustion%20Engine.htm http://www.velozeta.com/
http://www.newindpress.com/NewsItems.asp?ID=IEO20060903112344&Topic=0&Title=Thiruvananthapuram&Page=O
http://www.autocarindia.com/new/Information.asp?id=1263
http://en.wikipedia.org/wiki/Six_stroke_engine
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