SIX STROKE ENGINESIX STROKE ENGINE

ABHAY YADAVABHAY YADAV

ME-10ME-10

104001104001

What is Engine?What is Engine?

An An engineengine or or motormotor is a machine designed to is a machine designed to convert energy into useful mechanical motion. convert energy into useful mechanical motion. Heat engines, including internal combustion Heat engines, including internal combustion engines and external combustion engines (such engines and external combustion engines (such as steam engines) burn a as steam engines) burn a fuelfuel to create to create heatheat which which is then used to create motion. Electric motors is then used to create motion. Electric motors convert electrical energy into mechanical motion, convert electrical energy into mechanical motion, pneumatic motors use compressed air and others, pneumatic motors use compressed air and others, such as wind-up toys use elastic energy. In such as wind-up toys use elastic energy. In biological systems, molecular motors like myosins biological systems, molecular motors like myosins in muscles use chemical energy to create motion.in muscles use chemical energy to create motion.

IntroductionIntroduction

A six stroke engine derived its name from A six stroke engine derived its name from the fact that it is a mixture of two and four the fact that it is a mixture of two and four stroke engine.stroke engine.

This engine is a radical hybridization of This engine is a radical hybridization of two and four stroke engine that the top two and four stroke engine that the top portion of two stroke engine and the portion of two stroke engine and the bottom rather the middle section of a four bottom rather the middle section of a four stroke engine.stroke engine.

Principles of Two StrokePrinciples of Two Stroke

• Two stroke engines Two stroke engines got its name from the got its name from the fact that the required fact that the required strokes are completed strokes are completed in one revolution.in one revolution.

• In short there is one In short there is one power stroke in one power stroke in one revolution. revolution.

Principles of Four StrokePrinciples of Four Stroke

In the case of four In the case of four stroke engines, the stroke engines, the four strokes are four strokes are completed in two completed in two revolutions.revolutions.

There is a single There is a single power stroke in two power stroke in two revolutions.revolutions.

Concept of Six StrokeConcept of Six Stroke

This technology is also known as Beare This technology is also known as Beare Technology.Technology.This engine got its name due to its This engine got its name due to its construction. construction. This engine is a radical hybridization of This engine is a radical hybridization of two and four stroke engines.two and four stroke engines.These types of engines have many These types of engines have many advantages compared to OHC four stroke advantages compared to OHC four stroke engines. engines.

ConstructionConstructionThe drawbacks of poppet The drawbacks of poppet valves in conventional valves in conventional engines is overcome by engines is overcome by means of a rotary valve means of a rotary valve application to four-stroke application to four-stroke engine.engine.To replace the camshaft and To replace the camshaft and valves, Beare has retained valves, Beare has retained the cam drive belt and fitted the cam drive belt and fitted an ultra short-stroke upper an ultra short-stroke upper crankshaft complete with crankshaft complete with piston, which the belt drives piston, which the belt drives at half engine speed just as it at half engine speed just as it previously drove the cam. previously drove the cam.

ConstructionConstruction

It consist the basic It consist the basic components of a rotary components of a rotary disc induction two-stroke disc induction two-stroke engine.engine.

It is grafted on to a four-It is grafted on to a four-stroke, to produce the stroke, to produce the best of both worlds. best of both worlds.

WORKINGWORKING

1. Intake valve2. Heating chamber valve3. Combustion chamber

valve4. Exhaust valve 5. Cylinder6. Combustion chamber 7. Air heating chamber 8. Wall of combustion

chamber9. Fuel injector10. Heater plug

11stst - Stroke, Suction Stroke - Stroke, Suction Stroke

The intake valve (1) The intake valve (1) is open.is open.

Intake of pure air in Intake of pure air in the cylinder (5).the cylinder (5).

(1)

(5)

22ndnd – –StrokeStroke, Compression Stroke, Compression Stroke

The heating chamber The heating chamber valve(2) is open.valve(2) is open.

Compression of pure Compression of pure air in the heating air in the heating chamber(7).chamber(7).

(7) (2)

33rdrd - - StrokeStroke, power(work) Stroke, power(work) Stroke

The Combustion The Combustion chamber valve(3) is chamber valve(3) is open.open.Release of combustion Release of combustion gases in the cylinder (5).gases in the cylinder (5).

(3)

(5)

44thth – Stroke, Exhaust Stroke – Stroke, Exhaust Stroke

The exhaust valve (4) The exhaust valve (4) is open.is open.

Exhaust of the Exhaust of the combustion gases.combustion gases.

(4)

55thth - Stroke, power(work) Stroke - Stroke, power(work) Stroke

The heating chamber The heating chamber valve (2) is open.valve (2) is open.

Release of hot pure air Release of hot pure air into the cylinder (5).into the cylinder (5).

(2)

(5)

66thth – Stroke, – Stroke, RecompressionRecompression Stroke Stroke

The Combustion The Combustion chamber valve(3) is chamber valve(3) is open.open.Recompression of the Recompression of the pure air in the pure air in the combustion chamber.combustion chamber.

(3)

Thermodynamic AdvantagesThermodynamic Advantages

The Six stroke is thermodynamically more efficient The Six stroke is thermodynamically more efficient because the change in volume of the power stroke is because the change in volume of the power stroke is greater than the intake, compression, & exhaust strokes. greater than the intake, compression, & exhaust strokes.

Construction Issues

The mass of the reciprocating parts in the head The mass of the reciprocating parts in the head is about the same as a 4 stroke.is about the same as a 4 stroke.

The piston speed of the upper piston is about a The piston speed of the upper piston is about a quarter of the main piston; therefore its service quarter of the main piston; therefore its service life should be at least twice that of the main life should be at least twice that of the main piston. piston.

Per single cylinder the number of parts in the Per single cylinder the number of parts in the Beare design head is fifteen compared to a Beare design head is fifteen compared to a single overhead cam 4 stroke of approx. 40 to single overhead cam 4 stroke of approx. 40 to 50 parts. 50 parts.

Torque-Angle diagramTorque-Angle diagram

There’s improved torque at lower revs, which will surely help in the There’s improved torque at lower revs, which will surely help in the stop-and-go nature of congested Indian traffic. stop-and-go nature of congested Indian traffic. The six-stroke version produced the same torque as the four-stroke The six-stroke version produced the same torque as the four-stroke conventional motor 1000rpm lower down the rev scale, as well as conventional motor 1000rpm lower down the rev scale, as well as making exponentially more torque as revs rose. making exponentially more torque as revs rose.

ADVANTAGESADVANTAGES

i.i.   Reduction in fuel Reduction in fuel consumption by at least consumption by at least 40%.40%.

ii.ii. Thermal efficiency Thermal efficiency reaching 50% .reaching 50% .

iii.iii. Two expansions (work) Two expansions (work) in six strokes. in six strokes.

IV.IV. Dramatic reduction in pollution up to 60% to 90% Dramatic reduction in pollution up to 60% to 90%

depend upon types of fuel and also reduce a noise depend upon types of fuel and also reduce a noise

pollution. pollution.

V.V. Cooling system is not required so reduce engine Cooling system is not required so reduce engine

weight.weight.

VI.VI. The engine can run on a variety of fuels, ranging The engine can run on a variety of fuels, ranging

from diesel to LPG or animal grease.from diesel to LPG or animal grease.

VII.VII.Cost comparable to those of a four-stroke engine.Cost comparable to those of a four-stroke engine.

Comparison Of Six Stroke Engine Comparison Of Six Stroke Engine With Four Stroke EngineWith Four Stroke Engine

ConclusionConclusion

The industry trend away from cheaper two-The industry trend away from cheaper two-stroke power in favor of costlier but cleaner four-stroke power in favor of costlier but cleaner four-stroke engines in both Europe, Japan and South stroke engines in both Europe, Japan and South East Asia makes a concept like the Beare six-East Asia makes a concept like the Beare six-stroke, which offers the best of both worlds, stroke, which offers the best of both worlds, project a strong case towards volume project a strong case towards volume manufacture. manufacture.

150cc six-stroke Taiwanese single-cylinder bike 150cc six-stroke Taiwanese single-cylinder bike from Yingang is ready to roll. from Yingang is ready to roll.