HI-TECH INSTITUTE OF ENGG. AND TECHNOLOGY GHAZIABAD(U.P.)

Submitted To:Mr. Neeraj Kumar

SUBMITTED BY:NAME - SUMIT KUMAR BISWASCOURSE - B-TECH

SIX STROKE ENGINESIX STROKE ENGINE

ContentContentIntroduction Introduction Principle of Two Stroke Engine Principle of Two Stroke Engine Principle of Four Stroke EnginePrinciple of Four Stroke EngineConcept of Six Stroke EngineConcept of Six Stroke EngineTypes of Six Stroke EngineTypes of Six Stroke EngineConstruction Construction Working of Six Stroke EngineWorking of Six Stroke EngineAdvantagesAdvantagesConclusionConclusion

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.

Types of Six stroke engineTypes of Six stroke engine

There are three types of six stroke There are three types of six stroke Engine.Engine.

1)1)Crower six stroke engine.Crower six stroke engine.2)2)Beare Head six stroke engine.Beare Head six stroke engine.3)3)Bajulaz six stroke engine.Bajulaz six stroke engine.

1. Crower Six Stroke Engine1. Crower Six Stroke Engine This engine is made in U.S by Bruce Crower, after the This engine is made in U.S by Bruce Crower, after the exhaust stroke ,fresh water is injected into the cylinder, and exhaust stroke ,fresh water is injected into the cylinder, and is quickly turned to superheated steam, which causes the is quickly turned to superheated steam, which causes the water to expand to 1600 times its volume and forces the water to expand to 1600 times its volume and forces the piston down for an additional stroke.piston down for an additional stroke. The design also claims to reduce fuel consumption by The design also claims to reduce fuel consumption by 40%.40%. Crower’s six stroke engine features:-Crower’s six stroke engine features:-1)1)No cooling system required.No cooling system required.2)2)Improves a typical engine’s fuel consumption. Improves a typical engine’s fuel consumption.

2. 2. Beare Head Six Stroke EngineBeare Head Six Stroke Engine

This engine simply replaces the This engine simply replaces the convectional four stroke engines convectional four stroke engines cylinder head. The manufacturers cylinder head. The manufacturers four stroke bottom end remains four stroke bottom end remains unchanged.unchanged.The net result in:The net result in:1)1)Power torque increases of 30%.Power torque increases of 30%.2)2)Lower maintenance cost due to Lower maintenance cost due to less wearing port.less wearing port.3)3)Simpler and less expensive Simpler and less expensive manufacturing and tooling. manufacturing and tooling.

3. 3. Bajulaz Six Stroke EngineBajulaz Six Stroke Engine

The bajulaz six stroke engine is The bajulaz six stroke engine is similar to a regular combustion engine similar to a regular combustion engine in design . This Engine was invented in design . This Engine was invented in 1989 by the Bajulaz S A.in 1989 by the Bajulaz S A. Features:Features:1)1)Reduction in fuel consumption by at Reduction in fuel consumption by at 40%.40%.2)2)Two expansions in six stroke.Two expansions in six stroke.3)3)Dramatic reduction in pollution.Dramatic reduction in pollution.4)4)Liquefied petroleum gas. Liquefied petroleum gas.

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.

Working of Six Stroke EngineWorking of Six Stroke Engine1)1) Intake ValveIntake Valve2)2) Heating chamber valveHeating chamber valve3)3) Combustion chamber valveCombustion chamber valve4)4) Exhaust valveExhaust valve5)5) CylinderCylinder6)6) Combustion ChamberCombustion Chamber7)7) Air Heating ChamberAir Heating Chamber8)8) Wall of Combustion ChamberWall of Combustion Chamber9)9) Fuel Injector Fuel Injector 10)10)Heating PlugHeating Plug11)11)Piston Piston 12)12)CrankshaftCrankshaft

11stst Stroke(Suction Stroke) Stroke(Suction Stroke)

The inlet valve(1) is kept The inlet valve(1) is kept open.open.The piston moves The piston moves Downward which result in Downward which result in the formation of pressure the formation of pressure difference due to which difference due to which pure air enter the pure air enter the cylinder(5).cylinder(5). The crankshaft The crankshaft completes rotates for half completes rotates for half cycle.cycle.

22ndnd Stroke(Compression Stroke) Stroke(Compression Stroke)The inlet valve closes and The inlet valve closes and the heating chamber the heating chamber valve open.valve open.The Piston moves The Piston moves upwards due to cranking upwards due to cranking forcing the pure air into forcing the pure air into heating chamber.heating chamber.The air at the Stage is The air at the Stage is converted to high converted to high pressure.pressure.

33rdrd Stroke(1 Stroke(1stst Power Stroke) Power Stroke)

The Combustion chamber valve opens and the The Combustion chamber valve opens and the gases of combustion enter the cylinder.gases of combustion enter the cylinder.

44thth Stroke(Exhaust Stroke) Stroke(Exhaust Stroke)

The exhaust valve opens.The exhaust valve opens.The piston moves The piston moves upwards and the exhaust upwards and the exhaust gases are removed by gases are removed by this valve.this valve.The crankshaft rotates The crankshaft rotates another half cycle.another half cycle.At this stage the At this stage the crankshaft completes 2 crankshaft completes 2 full cycles.full cycles.

55thth Stroke(2 Stroke(2ndnd Power Stroke) Power Stroke)

The heating chamber The heating chamber valves opens and the pure valves opens and the pure air at high pressure and air at high pressure and high temperature enters high temperature enters the cylinder as shown in the cylinder as shown in fig.fig.Which does work on the Which does work on the piston hence its moves piston hence its moves downwards resulting 2downwards resulting 2ndnd power stroke.power stroke.The crankshaft completes The crankshaft completes another half cycle.another half cycle.

66thth Stroke Stroke

Finally the combustion Finally the combustion chamber valve open the chamber valve open the piston moves upwards piston moves upwards forcing the pure air into forcing the pure air into combustion chamber.combustion chamber.The crankshaft will The crankshaft will complete 3 full cycle at complete 3 full cycle at the end of 6the end of 6thth stroke. stroke.

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.

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

The compression ratio can be increased The compression ratio can be increased because of the absence of hot spots. because of the absence of hot spots. The absence of valves within the The absence of valves within the combustion chamber allows design combustion chamber allows design freedom. freedom. One-piece engine from crankshaft to One-piece engine from crankshaft to upper shaft becomes feasible. No head upper shaft becomes feasible. No head gasket.gasket.There are no valves to drop or bounce. There are no valves to drop or bounce.

AdvantagesAdvantagesGas flow on intake increase of 20%. Gas flow on intake increase of 20%. Possibility of engine damage if the timing belt slips Possibility of engine damage if the timing belt slips or snaps.or snaps.Increased torque and power output.Increased torque and power output.Better fuel economy.Better fuel economy.Cleaner burning and reduced emissions.Cleaner burning and reduced emissions.Longer service intervals.Longer service intervals.Reduced tooling cost.Reduced tooling cost.Low cost of manufacturing.Low cost of manufacturing.Low machining cost due to absence of valves.Low machining cost due to absence of valves.Higher compression ratio.Higher compression ratio.

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.