4 stroke engine

ByAjoy Infant Raj. A32810114002

Engine

An engine is motor which converts chemical energy into mechanical energy

History

• Otto Cycle: Dr. Nicolaus Otto -1876

History

Nicolaus August Otto in 1876 developed the “Otto cycle engine”.German mechanical engineer Karl Benz in 1885, designed and built the world's first practical automobile to be powered by an internal-combustion engine.

• Diesel Engine; Dr. Rudolph Diesel -1895

History

What is a Four Stroke Engine????

Working principle of four Stroke Engine

Following are the four strokes

1 – Intake/Suction stroke

2 – Compression stroke

3 – Expansion stroke

4 – Exhaust stroke

1 – Intake stroke

2 – Compression stroke

3 – Expansion stroke

4 – Exhaust stroke

Parts of an engine

Various Parts of Engine

• Crankshaft• Crankcase• Crank Pin• Camshaft• Spark plug• Fuel pump

• Cylinder Block• Cylinder Head• Inlet valve & Exhaust valve• Piston• Piston Rings• Connecting Rod• Gudgeon Pin

Cylinder Block

Cylinder Head

Inlet valve & Exhaust valve

Piston

Piston Rings

Connecting Rod & Gudgeon Pin

Crankshaft

Camshaft

Spark Plug

Fuel Injector

Difference between4-Stroke Engine & 2-Stroke Engine

• One cycle completed in every 2 revolution of crankshaft

• More moving parts• More maintenance• Heavy in weight• More expensive

• One cycle completed in every revolution of crankshaft

• Less moving parts• Less maintenance• Light in weight• Less expensive

4-Stroke Engine 2-Stroke Engine

Difference between4-Stroke Engine & 2-Stroke Engine

• Produce more pollution

• Long engine life• Not required

• Complex design

• Less pollution

• Short engine life• Required a mix of oil

to lubricate the crankshaft

• Simpler design

4-Stroke Engine 2-Stroke Engine