•Type of Engines

a) Internal combustion

i. Reciprocating

•Four stroke engine

•Two stroke engine

ii. Wankel engine

b) External combustion

i. Stirling engine

ii. Rocket

Automotive engines are internal-combustion(IC) engines because the fuel that runs them is burned internally or inside the engines. There are two types of internal combustion engine:

     a) Reciprocating

nReciprocating means moving up and down, or back and forth. They have piston that move up and down, or reciprocate in cylinder. These are piston engine.

     b) Rotary( Wankel Engine)

nRotary engines have rotors that spin, or rotate. The only such engine now used in automobiles is the Wankel’s engine

Four Stroke Spark Ignition Engine

nIntake

nThe piston moves from TDC to BDC.

nIntake valve opened.

nAir fuel mixture flows through the intake port.

   

nCompression.

nThe piston moves from BDC to TDC.

nBoth intake and exhaust valve is closed

nThe air fuel mixture is compressed

nPower

nBoth intake and exhaust valve is closed

nSpark plug ignites the compressed mixture of air and fuel.

nThe mixture of air and fuel combusts and push the piston from TDC to BDC.

 

nExhaust

nExhaust valve is opened.

nThe burned gases escapes through the exhaust valve.

The piston moved from BDC to TDC.