How does a engine works ? With classification
   

                An engine is a prime mover with the help of which heat energy obtained from the fuel, is converted into mechanical energy. engine is heart of the automobile.

  If it fails to work, the vehicle is dead. it is placed mostly in the rear as well as in the middle of chassis frame.

        The engine is fitted over the chassis frame by means of rubber mountings in order to insulate it from shocks.

  Types of engine

                 

Classification of engine

          The automobile engines are classified and varied on the basis a follows.

1) cycle of operations

       1.otto cycle engine

       2.diesel cycle engine

2) Number of strokes per cycle 

       1.four stroke engine

       2.two stroke engine

3) Number off cylinders

       1.single cylinder engine

       2.multi cylinder engine

4) Types of fuel used 

   

       1. petrol engine

       2. Diesel engine

       3. gas engine

5) Arrangement of cylinders

       1.In line engine

       2.V- type engine 

       3. opposed cylinder engine

       4. Radial engine

6) Arrangement of valves 

       1. L - head engine

       2. I-  Head engine side valve engine

       3. F - Head engine

       4. T-  head engine

7) Method of cooling 

      1. Air cooled engine

      2. Water cooled engine

8) Method of ignition 

      1. Spark ignition

      2. compression ignition

Arrangement of valves

             The engine valve can be arranged in four ways

1. L - head engine

            Both inlet and exhaust valve are placed at one side of the cylinder. the combustion chamber and cylinder form an inverted and hence "L" head engine.

2. I- head engine

             Both inlet and exhaust valves are located over the cylinder head of the engine, parallel to each other in a single row. combustion chamber and cylinder forming and hence "I" head engine. Automobile generally have this type of arrangement.

3. F- head engine

      The inlet valve is placed in the cylinder head and the exhaust valve at one side of the cylinder block. these engines being combinations of L-head and I-head engines are known as F- head engine.

4.T- head engine

        The inlet and exhaust valves are placed in separates rows by the opposite sides of the cylinder. The combustion chamber and cylinder form (T) and hence T-head engine.

Arrangement of cylinder

           The four arrangement used for the engine cylinders are as follows

1.In-line engine

            The cylinder are arranged in one row, side by side and parallel to each other. the cylinder may be placed horizontally, vertically inclined to one another.

2.V- shaped engine

     Two rows of cylinder are arranged such that the cylinder are at angle. V- engines are shorter in design compared to in-line engine. the short crank shaft provide rigidity and smooth operation at high engine speeds. A V-6 engine has two rows of three cylinder each, arranged at an of 60 degree.

3. opposed cylinder engine

           The cylinder are opposite to each other and the crankshaft is placed between them. the crankshaft is shorter in design as compared to in-line engine. it provides a good mechanical balance.

4.Radial engine

             the crankshaft is at the center and the cylinder are placed radially to it like spokes of a wheel. this arrangement is best suited for small air craft engines and is unsuitable for automobiles.