Why Do Marine Diesel Engines Have Different Firing Orders?

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Discussion Overview

The discussion centers around the differences in firing orders of marine diesel engines, exploring the reasons behind these variations. Participants inquire about the implications of firing order on engine performance and balance, with references to specific examples of counter-clockwise (CCW) and clockwise (CW) firing orders.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question the reasons for different firing orders in diesel engines, specifically asking about the implications for balance.
  • Participants inquire whether the discussion pertains to two-stroke or four-stroke engines, and whether the engines are inline or V configurations.
  • A participant references a common firing order for straight-six engines and notes that medium-speed marine engines often use a different order, suggesting that balance may be a factor.
  • There is mention of how matched pairs of counter-rotating engines may share crankshafts but differ in camshafts, fuel injection pump drives, and lubrication points, indicating complexity in engine design.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and inquiry regarding the topic, with no consensus reached on the reasons for the differences in firing orders or their implications.

Contextual Notes

Participants have not fully defined terms such as "balance" or clarified the specific contexts (e.g., engine type, application) in which these firing orders are being discussed. There are also unresolved questions regarding the impact of firing order on engine performance.

Who May Find This Useful

Individuals interested in marine engineering, diesel engine design, or those studying the mechanics of engine performance may find this discussion relevant.

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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