Why Do Marine Diesel Engines Have Different Firing Orders?

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SUMMARY

Marine diesel engines exhibit different firing orders, such as counterclockwise (CCW) 1-5-3-6-4-2 and clockwise (CW) 1-4-2-6-3-5, to achieve optimal balance and performance. Straight-six engines typically utilize a firing order of 1-5-3-6-2-4, ensuring perfect primary and secondary balance. In applications with counter-rotating engines, variations in camshafts, fuel injection pump drives, and oil lubrication systems are necessary to accommodate differing firing orders. Understanding these differences is crucial for effective engine design and maintenance.

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Marine engineers, diesel engine technicians, and anyone involved in the design or maintenance of marine diesel propulsion systems will benefit from this discussion.

babakN
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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
 
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babakN said:
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.
 
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.
 
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