Six stroke engine ppt

A PROJECT SEMINAR REPORT

ON.SIX STROKE

PETROLENGINE

Power Plugs: Templates

Department oF mechanicaL engG. g.I.e.t (polYTECHNIC)

jagatpur,cuttack.

CONTENTS:-

• Introduction• How six stroke engine works• Working principles• Specification of six stroke

engine• Comparison of six stroke engine

with four stroke engine• Graphs• Gallery• Thermodynamic advantages• Conclusion

What is Six stroke Engine ?

• The six stroke engine which having the same or more power with higher fuel efficiency than the existing engine has started before many years. As a result of all these researches a new engine concept is formed, which is a six stroke engine. Lot of research works are conducting on this topic now a days and already six stroke engines were discovered .

History of Six Stroke Engine.• The term six stroke engine describes two

different approaches in the internal combustion engine, developed since the 1990s, to improve its efficiency and reduce emissions, In the first approach, the engine captures the waste heat from the four stroke Otto cycle or Diesel cycle and uses it to get an additional power and exhaust stroke of the piston in the same cylinder. Designs either use steam or air as the working fluid for the additional power stroke..

Resent developed three six stroke engines

Beare head engines Bruce crowers

engines Velozeta’s engines are undergoing tremendous research works

Key attributes of the Beare Head are:-

Increased power, Increased torque, Fewer, lighter reciprocating

parts, Simpler manufacture

Beare Head piston engine :-

Classification Of six stroke Engine:

Single piston designs Griffin six stroke engine Bajulaz six stroke engine Crower six stroke engine Velozeta six stroke engine

Opposed piston design Beare head M4+2 Piston charger engine

single piston designs :-

These designs use a single piston per cylinder, like a conventional two- or four-stroke engine. A secondary, non-detonating fluid is injected into the chamber, and the leftover heat from combustion causes it to expand for a second power stroke followed by a second exhaust stroke

The Bajulaz Six Stroke Engine • The Bajulaz Six Stroke Engine was

invented in 1989 by the Bajulaz S A company, based in Geneva, Switzerland, The Bajulaz six-stroke engine is similar to a regular combustion engine in design. There are modifications to the cylinder head, with two supplementary fixed capacity chambers: a combustion chamber and an air preheating chamber above each cylinder. The combustion chamber receives a charge of heated air from the cylinder

Bajulaz Six Stroke Engine :

Crower six stroke engine:- This engine is invented by Bruce crower of

california in USA in the year 2004.Bruce Crower is actually a race car

mechanic with his own workshop. In a six-stroke engine prototyped in the United States by Bruce Crower, water is injected into the cylinder after the exhaust stroke and is instantly turned to steam, which expands and forces the piston down for an additional power stroke.

Crower six stroke engine:-

Velozeta six-stroke engine :-

• fresh air is injected into the cylinder during the exhaust stroke, which expands by heat and therefore forces the piston down for an additional stroke. The valve overlaps have been removed and the two additional strokes using air injection provide for better gas scavenging. The engine seems to show 40% reduction in fuel consumption and dramatic reduction in air pollution

Velozeta six-stroke engine :-

Opposed piston Engine.

• These designs use two pistons per cylinder operating at different rates, with detonation occurring between the pistons.

PISTON CHARGER ENGINE :-

In this engine, a “piston charger” replace the valve system, The piston charger charges the main cylinder & regulates the inlet & outlet aperture leading to no loss of air and fuel in the exhaust, in the main cylinder, combustion takes place every turn as in a two stroke engine & lubrication as in a four stroke engine, fuel injection takes place in the piston charger,

SYMBOLS USED :-TFC:- Total fuel consumption in Kg/HrSFC:- Specific fuel consumption in

Kg/KwhrBP :- Brake power in KwTDC :- Top dead centerBDC :- Bottom dead centerIVO :- Inlet valve openingIVC :- Inlet valve closingEVO :- Exhaust valve openingEVC :- Exhaust valve closingN :- Engine speed at rpm 

Engine parts are :-Cylinder HeadCam shaft Inlet valveSprocket 42TRocker Arm

Inlet Rocker armExhaust Rocker arm

Head CoverCam Lob Exhaust valve Air filter 42T sprocket holder

Exhaust ManifoldSpark plugCylinderPistonConnecting rodTiming ChainSprocket 14TCrankSecondary air

induction unitReed valve

Connecting Rod & Cylinder:-• Connecting Rod:

In a reciprocating piston engime, the connecting rod or conrod connects the piston to the crank or crank shaft . Together with the crank, they form a simple mechanism that converts reciprocating motion into rotating motion.• Cylinder:

A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine blocks, which is typically cast from aluminum, or cast iron before receiving precision machine work.

ENGINE MODIFICATION :-

To make six-stroke engine from conventional four-stroke engine, a few modifications must be done to specific parts on the conventional engine to be sure that the newengine with six-stroke will run successfully. A Mitsubishi single cylinder spark ignitionengine was used to apply these modifications on it. These modifications are: Crankshaft to Camshaft Ratio Modification

1. Camshaft /crankshaft sprockets :-• Crank has 1080 degrees of

rotation for 360 degrees rotation of camshaft

• Hence their corresponding spockets are having teeth ratio 3:1

• 34 teeth spocket of camshaft in the four stroke is replaced by 42 teeth spocket

• 17 teeth crankshaft spocket is replaced by 14 teeth spocket

2. Cam lobes:-• 360 degrees of cam as devided into 60 degrees among six strokes

• Inlet valve is opened in the first stroke only & the exhaust valve, in the fourth, fifth & sixth strokes by the exhaust valve cam,

• The exhaust valve cam is double lobed,

WORKING PRINCIPLE :-A six stroke engine describes a number of different approaches in the internal combustion engine to capture the waste heat from the four stroke Otto cycle and use it to power an additional power and exhaust stroke of the piston. Designs either use steam or air as the working fluid for the additional power stroke. As well as extracting power, the additional stroke cools the engine and removes the need for a cooling system making the engine lighter and giving 40% increased efficiency over the Otto Cycle.

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.

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 thecylinder during the fifth stroke is removed to the atmosphere through the exhaust manifold. The reed valve opens and the reed valve closes.

TESTING THE ENGINE :-:-

After applying these modifications on the engine, a test was carried out to be sure

that the engine can run smoothly with six stroke instead of four stroke cycles. The

same starter coupled with the engine was used to start the engine. After two or three

attempts the engine was running smoothly with six stroke cycles.

Comparison Of Six Stroke Engine With Four Stroke Engine

In a six stroke engine the energy absorption is less because of slower acceleration of reciprocating parts.

It reduces the weight and complexity of the engines head by as much as 50%. Instead of using energy to drive the head.

  Torque is increased by 35% and

efficiency increased by the same. Increased torque and power output.

ADVANTAGES :-` Reduction in fuel

consumption Dramatic reduction in

pollution normally up to 65%Lower engine temperature so

easy to maintain the optimum engine temp. level for better performance

Less friction – so , less wear and tear

The six-stroke engine does not require any basic modification to the existing engines.

Higher overall efficiency

Conclusion

In a six stroke engine the energy absorption is less because of slower acceleration of reciprocating parts The piston speed of the upper piston is about a quarter of the main piston; therefore its service life should be at least twice that of the main piston.

In the Beare design, per single cylinder, the number of parts is 15 compared to a four stroke of approx 40 to 50 parts. Also, to reduce manufacturing costs the head and block can be machined in o ne piece.

ANY QUESTION ?

THANK YOU.