Skip to main content

Requirement of the ignition system and ignition/firing order in the IC engine

The ignition system is the most important part of the SI engine (spark ignition engine). Different types of ignition systems are used in the Internal Combustion SI engine. Ignition system used to ignite air-fuel mixture at the proper time and in a well suitable manner with the wild range of engine speed.

A requirement of the ignition system

Ignition system mainly needed in an engine due to the following reasons.

  • It should provide a good spark between the electrodes of the plug at the correct timing.

  • The ignition system should function efficiently over the entire range of engine speed continuously.

  • Also, it should be light, effective, and reliable in service.

  • It should be compact and easy to maintain.

  • It should be cheap and convenient to handle.

  • The interference from the high voltage source should not affect the functioning of the radio and television receivers inside an automobile.

Firing order in the IC engine

The order in which various cylinders of multiple cylinder engine fire is called firing order.

  • The main factor considered deciding the order of firing the engine cylinder are the balancing of the reciprocating engine to reduce vibration, engine cooling, and the development of backpressure.

  • By balancing reciprocating and rotary parts, the unbalanced force and couple transmitted to the bearing of the engine shaft are reduced.

  • Considering 4 cylinders inline engine, if the firing order is kept in line as 1-2-3-4, the exhaust of the cylinder will overlap. It would need a larger size of the exhaust pipe. Otherwise, the backpressure on the engine cylinder will increase.

  • Thus the firing order of the engine is decided based on the above consideration for 4 cylinder engines. The firing order is usually kept as 1-3-4-2 or 1-2-4-3. The firing timing order 1-3-4-2 is more commonly used.

  • Firing order for six-cylinder inline engine usually are 1-5-3-6-2-4, 1-5-4-6-2-3 and 1-2-3-6-5-4. The firing timing order 1-5-3-6-2-4 is most commonly used.


Labels:

Comments

Post a Comment

Popular posts from this blog

Quenching process

Quenching also called Hardening, is a heat treatment process in which steel is heated up to austenite temperature (above it's critical temperature), hold for some time and then cooled in water, oil or molten salt (rapid cooling). Due to rapid cooling, it results very hard structure - martensite (hardest form of Steel). fig.- steel component quench in oil. Due to hardening process hardness of steel increases and bitterness also increases. (brittleness increases hence hardened Steel nay not directly use). Quenching is always follow by tempering process. Due to rapid cooling in hardening process metal shape shrink, internal residual stresses are setup. That's the reason why hardening is follow by tempering.
Post a Comment
Read more

What is heat treatment process ?

know the Heat Treatment...! Heat treatment is defined as the operations involving the heating and cooling of a metal or an alloy within a solid-state to obtain desire properties (physical or chemical) without change composition. The heat treatment process is carried out to change the grain size, modified the crystal structure of the material, and relieve the stress set up in the material after hot or cold working. Heat treatment also uses in many manufacturing processes, eg. glass working. The heat treatment process is performed in the furnace or oven with a controlling the environment of step-by-step heating and cooling within a specific period of time, apart from this the gases are used to control the furnace environment in some processes.  Fig.1 - Heat treatment process of gears Heat treatment consists of heating of metal near of above re-crystallization temperature of the material, hold for a particular time, and then finally cooling the metal in some medium which may be air, ...
Post a Comment
Read more

Additive Manufacturing processes

  What is Additive Manufacturing? As the name suggests, Additive Manufacturing (also known as 3D printing) is a group of manufacturing techniques , which manufacture parts by adding successive layers of material with the help of computer control systems. Various materials that can be used in additive manufacturing (AM) are plastic, metal, concrete, also human tissue. In the additive manufacturing process, Computer-Aided Design (CAD) is created and utilized to manufacture 3-Dimension (3D) objects. Various CAD-CAM software is required to Design, Analyze, and Manufacture parts. Once CAD data is produced, Slicing software slices the design in different layers (as required by different  AM processes), and then data utilized to manufacture required material parts. Different terms like “3D printing” and “rapid prototyping” are also casually used to describe Additive manufacturing, but each one is a subset of additive manufacturing. Hence in the simple sense, Additive manufacturing te...
Post a Comment
Read more