The sequence or order in which the firing takes place in different engine cylinders of a multi-cylinder engine is called the firing order. In spark ignition engine, the high tension leads from the distributor are connected to the spark plugs at the different cylinders according to the firing order.
Requirements Of Proper Firing Order
A proper firing order reduces engine vibrations, maintains engine balancing and secures an even flow of power. The firing order differs from engine to engine. Probable firing orders, for different engines, are as follows:
|Firing Order Of 8 Cylinder Engine|
3 -cylinder engine
4-cylinder in-line engine
4-cylinder horizontal opposed engine (Volkswagon engine)
6-cylinder in-line engine(cranks in 3 pairs)
8-cylinder in-line engine
1- 5-3- 6-2-4-7-8
8-cylinder V-type engine
Watch the video below to understand all about engine Firing Order.
Even and Uneven firing order
|Spark distribution in 4 cylinder engine according to Firing Order.|
Examples of Odd-firing engines are:
- Harley-Davidson Evolution engines.
- Most 4-stroke V-Twins.
- 1986-Honda VFR 750/800.
- 2009-2014 Yamaha YZF-R1.
- Audi V10 FSI as in the Audi R8 V10.
- 2nd / 3rd generation Lamborghini Gallardo.
- Viper V10.
- Yamaha V-Max and VMAX.
- Buick 231 Odd-Fire V6.
Examples of Even-firing engines are:
- Honda NSR500V and most 2-stroke V-Twins.
- Most current production inline 4-cylinder engine.
- Most current production V6s.
- Lotus Esprit V8.
- Porsche 918 Spyder.
- McLaren M838T engine.
- Audi V10.
- 1st generation Lamborghini Gallardo.
- Toyota LR engine.
Also, Read These Posts
- The function of the Distributor in Ignition System?
- How the Contact Breaker works in the Ignition System?
- What is the function of Ignition Coil in the Ignition System of a vehicle?
- How the Battery Ignition System work?
- What is Magneto Ignition System?