METHOD OF IGNITION

1. Compression ignition engine

     In this type of engines, there is no extra equipment to burn the fuel. In this burning of fuel starts due to temperature rise during the compression of air. So it is known as compression ignition engine. Diesel is used as fuel for the working of this engine. It works on the principle of the Diesel cycle. The compression ratio of this type of engine usually ranges from 14:1 to 22:1. It is used in heavy-duty vehicles like buses, trucks, ships, etc.

2. Spark ignition engine.

    In this type of engines, ignition of fuel start by the spark, generate inside the cylinder by some extra equipment. So it is known as a spark ignition engine. This engine uses petrol as a fuel for its working. It works on the principle of the Otto cycle. The fuel in this engine is injected through carburetor during suction stroke. The compression ratio of this engine is usually 6 to 10. It has a lightweight engine and used in light-duty vehicles like a motorcycle, cars, etc.