How does a spark ignition engine work?

In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.

What are the six basic engine systems in a spark ignition?


  • Suction Stroke: Air-fuel mixture enters into the cylinder.
  • Compression Stroke: Compression of air fuel mixture takes place.
  • Power Stroke: Combustion of Fuel and Power Generation.
  • Exhaust Stroke: Escaping of burnt gases out of the engine.

What is the advantage of spark ignition engines?

Gasoline engines — which use spark ignition — are typically considered to give off lower emissions and provide higher efficiency and performance capacities than diesel engines. Typically more lightweight, quieter and cheaper as well, these are the most common type of engine on the American market.

What are the parts of spark ignition engine?

The main parts of the spark-ignition engine are given below:

  • Spark plug.
  • Cylinder or Combustion chamber.
  • Carburetor.
  • Piston.
  • Inlet or Suction valve.
  • Connecting rod.
  • Exhaust valve.
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What are the four strokes in a spark ignition engine?

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft.

What is IC and SI engine?

The Spark Ignition (SI) engine, as its name indicates uses spark to ignite the fuel. … And in Compression Ignition (CI) engine, the air is compressed within the cylinder and the heat of this compression air is used to ignite the fuel.

Why is the petrol engines called spark ignition engines?

The term spark-ignition engine refers to internal combustion engines, generally petrol engines, where the combustion process of the air-fuel mixture is ignited by a spark from a spark plug.

What is meant by SI 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.

What is the difference between two stroke and four stroke?

The main difference between a 4-stroke engine and a 2-stroke engine is that a 4-stroke engine goes through four stages, or two complete revolutions, to complete one power stroke, while a 2-stroke engine goes through 2 stages, or one complete revolution, to complete one power stroke.

What are the effects of knocking?

Explanation: The effects of knocking are. i) noise and roughness. ii) mechanical damage. iii) carbon deposits. iv) increase in heat transfer.

Which of the following is spark ignition engine?

Detailed Solution

Petrol Engine /Spark Ignition Engine Diesel Engine/ Compression Ignition Engine
The carburettor is applied to mix air and petrol in required proportion to supply it to the engine during suction stroke. The injector or atomiser is employed to inject the fuel at the end of compression stroke.
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What is positive ignition engine?

positive ignition engine means an internal combustion engine in which combustion is initiated by a localised high temperature in the combustion chamber produced by energy supplied from a source external to the engine; Sample 1.

What oil goes in a 4-stroke engine?

The standard oil used for 4-stroke engines found on petrol lawnmowers is grade SAE 30. Synthetic variations include SAE 5W-30 and SAE 10W-30. These offer enhanced performance and higher level of protection however cost more.

What is suction stroke?

Definition of suction stroke

: the stroke of the piston in an internal-combustion engine that effects the drawing in of the gaseous mixture to the engine cylinder.

How does four-stroke engine works?

A 4-stroke engine is a very common variation of an internal combustion engine. … During engine operation, pistons go through 4 events to achieve each power cycle. The definition of an event is an up or down piston motion. Upon completion of the 4 events, the cycle is complete and ready to begin again.