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15
6 STROKE ENGINE TECHNICAL SEMINOR ON BY MANIKANTAN.M 1HS11AE024

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6 STROKE ENGINE

TECHNICAL SEMINOR

ON

BYMANIKANTAN.M

1HS11AE024

Contents

What is 6-stroke engine and why we need it?

Types of 6-stroke engines.

Velozeta’s six stroke engine.

Engine parts modified.

Working principle.

Comparison of 6-stroke with 4-stroke engine.

Advantages and disadvantages.

Applications.

Conclusion.

1st approach 2nd approach

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

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.

Engine parts modified

1. Camshaft / Crankshaft Sprockets:-

Crank has 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 is

replaced by 42 teeth sprocket

17 teeth crankshaft sprocket is replaced by 14 teeth

sprocket

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

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

Working of the engine

First stroke:- During the first stroke the inlet valve opens and

air-fuel mixture from carburetor is sucked into the cylinder through

the inlet manifold .

Second stroke:- During the second stroke, piston moves from BDC to

TDC, both the inlet valve and exhaust valve 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 . Both valves remain

closed. Piston moves from TDC to BDC.

Fourth stroke:-

During the fourth stroke, the exhaust valve and the reed valve 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 remains open and the reed

valve closes. Fresh air from the air filter enters the cylinder through the

secondary air induction line provided at the exhaust manifold . The reed valve

opens.

Sixth stroke:-

During the sixth stroke, the exhaust valve remains open. The air

sucked into the cylinder during the fifth stroke is removed to the atmosphere

through the exhaust manifold . The reed valve opens and the reed valve closes.

1. Rings 17. Connecting rod2. Inlet Manifold 18. Timing Chain3. Cylinder Head 19. Sprocket 14T4. Cam shaft 20. Crank5. Cam Lob No.1 21. Secondary air induction unit6. Inlet valve 22. Reed valve (One way valve)7. Sprocket 42T 23. Reed valve (One way valve in Exhaust manifold)8. Rocker Arm 24. Air filter8.1. Inlet Rocker arm 25. 42T sprocket holder8.2. Exhaust Rocker arm 26. Bearing9. Head Cover10. Cam Lob no.311. Exhaust valve12. Cam Lob No.213. Exhaust Manifold14. Spark plug15. Cylinder16. Piston

Detailed label of velozeta engine parts

Comparison between 4-stroke and 6-stroke engine

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 does’t require any basic modification to the existing engines. All technological experience and production methods remain unalteredHigher overall efficiency

Applications

IN RACING CARS.

IN HEAVY VEHICLES.

EARTH MOVING VEHICLES.

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.