GREATER NOIDA INSTITUTE OF TECHNOLOGY
(2015-16)
DEPARTMENT OF MECHANICAL ENGG.SEMINAR PRESENTATION
ON
4- stroke petrol engine
Submitted To: Submitted By:
Mr. Syed Qaiser Husain Sheshnarayan Yadav
CONTENTS
INTRODUCTION OF PETROL ENGINE PARTS WORKING VALVE TIMING 2 STROKE V/S 4 STROKE ENGINE PETROL ENGINE V/S DIESEL ENGINE ADVANTAGES & DISADVANTAGES
INTRODUCTION OF PETROL ENGINE
Uses Petrol As A Fuel. Inside The Combustion Of Fuel Produces Hot Gases That Expand
Against Parts Of The Engine The Engine And Cause Them To Move. For This Reason, Petrol Engines Are Called Internal-combustion
Engines. A Petrol Engine Turns Heat Energy Into Mechanical Work. Produces Work Is Usually Measured In Horsepower Or Watts. Nearly All Cars, Lawn Mowers, Motorcycles, Motor Scooters,
Snowmobiles, And Small Tractors Have Petrol Engines. So Do Many Trucks, Buses, Aeroplanes, And Small Boats.
TYPES OF PETROL ENGINE2-STROKE PETROL
ENGINE
4-STROKE PETROL ENGINE
4-STROKE PETROL ENGINE A four-stroke engine:
The first four stroke spark-ignition (S.I.) engine was built in 1876 by Nicolaus August Otto, a self-taught German engineer
it is an internal combustion engine Converts gasoline into motion the piston completes four separate strokes while
turning a crank shafts the most common car engine type Is relatively efficient Is relatively inexpensive
PARTS OF 4-STROKE PETROL ENGINE
CYLINDER BLOCKCYLINDERSCYLINDER HEADCRANKCASEPISTON AND
CONNECTING RODS
LUBRICATION SYSTEM
CRANK SHAFTFLYWHEELVALVESCAMSHAFT FUEL SYSTEMEXHAUST
SYSTEM
WORKING
INTAKE STROKE
COMPRESSION STROKE
POWER STROKE
EXHAUST STROKE
VALVE TIMING
2 STROKE V/S 4 STROKE ENGINE4-STROKE ENGINE
It has one power stroke for every two revolutions of the crankshaft.
Engine is heavy.
Engine design is complicated due to valve mechanism.
More cost.
Less mechanical efficiency.
Engine runs cooler.
Less fuel consumption
Engine requires more space.
Less noise.
More thermal efficiency.
consumes less lubricating oil.
2-STROKE ENGINE
It has one power stroke for each revolution of the crankshaft.
Engine is light.
Engine design is simple due to absence of valve mechanism.
Less cost.
More mechanical efficiency.
Engine runs hotter.
More fuel consumption.
Engine requires less space.
More noise.
Less thermal efficiency.
consumes more lubricating oil.
PETROL ENGINE V/S DIESEL ENGINEPETROL ENGINE
In a petrol engine, the explosion process is: Intake stroke – fuel is
mixed with air Compression stroke –
piston goes up, mixture of fuel and air is compressed
Ignition stroke – fuel/air is ignited through the use of a spark plug
Exhaust stroke – piston goes up, pushes exhaust through the exhaust valve
DIESEL ENGINEIn a diesel engine, the explosion process is: Intake stroke – intake valve
opens, air in, piston goes down Compression stroke – piston
goes up, air compressed (heated upto 3000k)
Combustion stroke – fuel is injected (right time), ignition, piston goes down
Exhaust – piston goes up, pushes exhaust through the exhaust valve
ADVANTAGES
More TorqueLast LongerRun Much Cleaner Than 2 Strokes
More Efficient Use Of Gas
DISADVANTAGES
ComplicatedHalf As Powerful As Two Stroke Engines
More Expensive Than 2 Stroke
THE END
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