Why Do Marine Diesel Engines Have Different Firing Orders?

[babakN]

TL;DR

Firing order, from CCW and CW

This is my question, the reason for the difference in the firing order What is for diesel engines? Example CCW 1,5,3,6,4,2 CW is a 1,42,6,3,5

 

[Bystander]

TL;DR Summary: Firing order, from CCW and CW

This is my question, the reason for the difference in the firing order What is for diesel engines? Example CCW 1,5,3,6,4,2 CW is a 1,42,6,3,5

Balance? A little more information would be useful.

 

[Baluncore]

Two stroke, or four stroke?
Inline 6, or V6 ?
Numbered from the front or the rear?

https://en.wikipedia.org/wiki/Firing_order#Common_firing_orders
"Straight-six engines typically use a firing order of 1-5-3-6-2-4, which results in perfect primary and secondary balance. However, a firing order of 1-2-4-6-5-3 is common on medium-speed marine engines."

Where a matched pair of counter rotating engines is used, the cranks may be the same, but the camshafts, fuel injection pump drive, and the oil lubrication pump will be different. The optimum bearing lubrication points will also be different.

 

[Lnewqban]

This is my question, the reason for the difference in the firing order What is for diesel engines?

Welcome, @babakN !

Please, see:
https://www.brighthubengineering.com/marine-engines-machinery/99093-marine-diesel-firing-order/