Study Science notes on Engines for Secondary. Useful for revision, homework, and exam preparation in Zimbabwe.
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FUEL ENGINES ENGINES An engine is a machine which converts Chemical energy in fuel to Heat and Kinetic energy. There are two types of car engines: 1. Petrol Engine (a.k.a. spark Ignition Engine). 2. Diesel Engine (a.k.a. compression Ignition Engine). FOUR-STROKE PETROL ENGINE In a four stroke petrol engine the cycle of operation is completed in four strokes of the piston or two revolution of crankshaft. It involves the following 4 steps: - Intake stroke, Compression stroke, Power stroke and Exhaust stroke. A petrol engine is also known as a Spark Ignition Engine because it uses a spark plug to ignite fuel. FIG: Cycle of operation of 4-stroke petrol engine. © MR TEE 2017 SCIENCE MADE SIMPLE © MR TEE 2016 Page 1