SIX STROKE ENGINESIX STROKE ENGINE

Bilal Husain Bilal Husain

BS ETBS ET

13-F-24613-F-246

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.

Fuel ignites with pistonFuel ignites with piston

at the top dead center.at the top dead center.

WorkingWorking

Rotary valve opens,Rotary valve opens,

allowing exhaust to escapeallowing exhaust to escape

Exhaust stroke Exhaust stroke begins when the begins when the pistonpiston is at bottom is at bottom dead centerdead center

Exhaust stroke ends,Exhaust stroke ends,

intake begins. intake begins.

rotary valve cuts exhaust.rotary valve cuts exhaust.

intake of charge into intake of charge into

cylinder due to pressurecylinder due to pressure

differencedifference

The intake stroke The intake stroke happens when the happens when the piston is on its piston is on its downward path with downward path with the intake valve open. the intake valve open. This action creates This action creates suction, drawing suction, drawing atomized fuel in this atomized fuel in this case gasolinecase gasoline

MMixed with air, into ixed with air, into the the combustion chambercombustion chamber

Top piston nearly closes Top piston nearly closes

complete inlet port andcomplete inlet port and

The compression beginsThe compression begins

The power stroke beginsThe power stroke begins

at a critical moment,at a critical moment,

just as the air-fuel mixturejust as the air-fuel mixture

is at its most is at its most compressedcompressed..

AdvantagesAdvantages

Increased torque and power output.Increased torque and power output.Reduced tooling cost.Reduced tooling cost.Higher compression ratio.Higher compression ratio.

Increased torque and power output.

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.