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What is the sole purpose for selection of various firing orders by companies?

Question asked by Sarathkumar Chandrasekaran in #Coffee Room on Oct 7, 2013
Sarathkumar Chandrasekaran
Rank A2 - PRO
Why different companies use different firing order ?
we know that firing order will be defined to the companies requirements.Whether it may be power or efficiency or sound.We know that following firing order are used : 2stroke engine-12,
3stroke-132,123,
4stroke-1432,1342,1243,1324,1234,
5stroke-12453,
6stroke-153624,143625,165432,123456,142536,145236,163254,162435,162534,
And the list expands as above said in wiki while i searched.So i want to know what is the exact reason behind this?
what will be the criterias considered for selection of firing order?
Different reasons were explained by my friends such as to reduce vibration.Some of them say that it will depend on design considerations and some
How to find the firing order in a car ?what should be noted to find firing order?
Please explain in brief. Posted in: #Coffee Room
Siddhant Mukherjee
Siddhant Mukherjee · Oct 25, 2013
Rank D1 - MASTER
The exact reason behind selecting firing order is balancing. I.C. Engines mostly use slider crank mechanism which creates an unbalanced force when it works. the unbalance is a function of crank angle . So, firing order is set so that the net force of unbalance tends to be zero. This will increase life of crankshaft and result in a design which would include less weight of shaft used. Also it will aid in smooth running of engine.
Sarathkumar Chandrasekaran
Rank A2 - PRO
S.mukherjee
The exact reason behind selecting firing order is balancing. I.C. Engines mostly use slider crank mechanism which creates an unbalanced force when it works. the unbalance is a function of crank angle . So, firing order is set so that the net force of unbalance tends to be zero. This will increase life of crankshaft and result in a design which would include less weight of shaft used. Also it will aid in smooth running of engine.
Yes but if they use same number of cylinders why do they want yo use different firing order?
Is it to show their uniqueness or for better efficiency ?
Siddhant Mukherjee
Siddhant Mukherjee · Oct 26, 2013
Rank D1 - MASTER
SarathKumar Chandrasekaran
Yes but if they use same number of cylinders why do they want yo use different firing order?
Is it to show their uniqueness or for better efficiency ?
No friend, there is nothing related to show off. The firing order will differ if the orientation of the cylinders is changed. Even the different cylinder arrangements you see like V, inline, boxer etc. are chosen seeing the ease of balancing them and also seeing the application of the automobile. For example, a high rpm engine will like to use a V arrangement than an inline one. Now, there are cases where the cylinder configuration is same yet the firing order is different. For this, what i can say is that if you have a four cylinder engine. to dynamically balance the forces you may have more than one combination of crank angle orientation. So, will the firing order change in acordance with it. In simple words you can say that (12=4*3) and (12 is also= 6*2).

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