SI ENGINE.

                            SPARK-IGNITION ENGINE.

A spark-ignition engine (si engine) is an internal combustion engine, generally a petrol engine, where the combustion process of the air -fuel mixture is ignited by a spark from a spark plug. This is in contrast to compression-ignition engines, typically diesel engine, where the heat generated from compression together with the injection of fuel is enough to initiate the combustion process , without needing any external spark.

spark-ignition engine are commonly referred to as 'gasoline engines' in north North America, and 'petrol engines' in Britain and the rest of the world. However ,these terms are not preferred, since spark-ignition engines can run on fuels other than petrol/gasoline, such as autogas (LPG) methanol, ethanol , bioethanol, compressed natural gas (CNG) , hydrogen, and (in drag racing) nitromethane.

IC ENGINE

      INTERNAL COMBUSTION ENGINE

The internal combustion engine is a heat engine that converts heat energy (chemical energy of fuel) into mechanical energy (usually made available on a rotating output shaft)

Internal-combustion engine, any of a group of devices in which the reactants of combustion (oxidizer and fuel) and the products of combustion serve as the working fluids of the engine. Such an engine gains its energy from heat released during the combustion of the nonreacted working fluids, the oxidizer-fuel mixture.

WHAT IS ENGINE?

 Basically Engine is a moving parts that converts power into motion.

A Engine is a machine designed to convert one form of energy into mechanical energy   There are 2 types of Engine are 

1.Internal combustion engine or ic Engine.

2.External combustion engine or si Engine.

BRANCHES OF MECHANICAL ENGINEERING.

MECHANICAL ENGINEERING IS A BRANCH OF ENGINEERING THAT IS CONCERNED WITH THE DESIGN AND MANUFACTURE OF MACHINE.

IT IS THE LARGE SUB-DIVISION OF ENGINEERING.WHICH CONSISTS OF TOPICS LIKE MACHINE,DESIGN,MANUFACTURING PROCESSES,THERMAL ENGINEERING,FLUID MECHANICS,AERONOTICS ENGINEERING ,AUTOMOBILE ENGINEERING.MECHATRONICS.

WHAT IS MECHANICAL ENGINEERING?

MECHANICAL ENGINEERING IS AN ENGINEERING BRANCH THAT COMBINES ENGINEERING PHYSICS AND MATHEMATICS PRINCIPLES WITH MATERIAL SCIENCE TO DESIGN ,ANALYZE,MANUFACTUREAND MAINTAIN MECHANICAL SYSTEMS .IT IS THE VERSATILE FORM OF MAKING MACHINE DESIGN .........................