Because of Tier 4?

[RumT]

In the whole 3.2 hours (for a total of 5.1 on the clock) I've put on my '14 B2620, I've noticed the engine idles at 1000, or a bit more, and limits at 3000 rpm, per the specs on this specific engine.

In the previous versions of the D1105, idle range was 850-950 and max speed governing was set at multiple speeds above 3k, depending on which sub model.

Any thoughts as to why this is?

A higher idle speed for more air intake and cleaner emmisions?

A lower max speed in order to limit emmisions output?

Thoughts.......

 

[kc8fbl]

That is a very good possibility why they are set those specs. The idle could be set a little higher to get rid of some vibrations. Just my thoughts on this. I had a B7610 and it seems that it governed out at 2700, 2800 rpms. It was a 2005 model.

 

[RumT]

Yea, there could be a vibe issue with this bore and stroke combination. Interesting.

 

[kc8fbl]

It idled at 1000 rpms. It ran very smooth, but I didn't like it idling that high. I adjusted the screw that controlled the idle and turned it so it idled about 800 rpms. I noticed a little more vibration, but it didn't bother me.