Petrol Engine Nb

NAME OF THE SCHOOL

GOVT. SEC SCHOOL.BOYS.NABHA

PROJECT ON PETROL ENGINE

INDEX 1. History of Engine 2. Engine 3. Classification of Engine 4. Internal Combustion 5. Four principal types of internal combustion engine 6. Types of petrol engine (a) Two stroke engine (b) Four stroke engine 7. Operation of four stroke cycle petrol engine (a) Suction stroke (b) Compression stroke (c) Power stroke (d) Exhaust stroke 8. Parts of combustion system 9. Difference between Two stroke and four stroke engine

HISTORY OF ENGINE First ever three wheeler with Petrol Engine was invented by Nicole Joseph from France in 1760. Its speed was 3km/ hr. After some time, a four wheeler car was invented by ‘Avers’. Later in 1885 first 4 Stroke (Engine) car was invented by Dembler Benz.

ENGINE Machine for converting energy into motion or mechanical work. Parts of Combustion System of petrol engine • Cylinder • Crankshaft • Exhaust Manifold • Piston • Spark plug • Intake Manifold • Fuel injector • Valve

Four principal types of internal-combustion engines are in general use: • The Otto-cycle engine ,(petrol engine) • The diesel engine, • The rotary engine, • The gas turbine.

Classification of Engine 1 Internal combustion engine 2 External combustion engine

Internal-Combustion • Internal-Combustion Engine Any type of machine that obtains mechanical energy directly from the expenditure of the chemical energy of fuel.

Types of Petrol Engine • Two Stroke Petrol Engine • Four Stroke Petrol Engine

TWO-STROKE ENGINES

• The power of a two-stroke engine is usually double that of a four-stroke engine of comparable size. • First Stroke (Suction And Compression Stroke) • Second Stroke (Power and Exhaust Stroke)

First Stroke During the first stroke, as the piston moves up from the BDC, it closes all the three ports, namely the inlet, transfer and exhaust ports. The piston compresses the mixture of petrol and air inside the cylinder.

Second stroke

• During the second stroke, the piston moves down from the TDC And the inlet port is closed. The fuel mixture is compressed by the bottom of the piston and the crank. It then gets pushed into the cylinder through the transfer port.

OTTO-CYCLE ENGINES The ordinary Otto-cycle engine is a

Four-Stroke Engine

OPERATION OF FOUR STROKE CYCLE PETROL ENGINE • • • •

Suction Stroke Compression Stroke Power Stroke Exhaust Stroke

Suction Stroke • During the suction stroke, the inlet valve is opened and the exhaust valve is closed.

Compression stroke • During the compression stroke both the inlet and exhaust valves are closed.

Power Stroke Both the inlet and exhaust valves remain closed during the power stroke.

Exhaust Stroke • During the exhaust stroke, the inlet valve is closed and the exhaust valve is opened. When the burnt gas is pushed out of the cylinder, the exhaust valve closes.

Difference between Four-stroke Engine and Two stroke Engine Four-stroke Engine 1.Power is developed for every two

revolutions of the crankshaft crankshaft 2.Consist of valves, camshafts and tappets. valves 3.For the same size, power is less for the more for same number of revolutions revolutions 4.Engine is water cooled 5.Used in cars and commercial vehicles

Two-stroke Engine 1. Power is developed for every one revolution of the 2. Consist only of ports with no 3. For the same size, power is the same number of 4. Engine is air cooled 5. Used in motor cycle, scooter

REFERENCES • MICROSOFT ENCARTA ENCYCLOPEDIA • AUTOMOBILE TEXT BOOKS • INTERNET

Made By (CLASS 9TH) GURWINDER SINGH DAVINDER SINGH KRISHEN SONY

GUIDED BY Mr.PARMINDER SINGH (STUDENT TRAINER)

Mr.RAMANDEEP (LECT.AUTOMOBILE)