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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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