QSM11 Low Power

[mattinglyjc]

I have twin QSM11s and one has recently started only pulling 1800 rpm at WOT and the other is only 1950-2000 (assuming extra labor is pulling it down). Both free spin to the 2350 as tagged on enigines. All filters and racors have been changed, no prop changes. No black smoke. An ideas?

2005 Formula 48Yacht
670 hrs

Topic

[Tony Athens]

1) Post your fuel burn at 1700, 1900, 2000, 2100 RPM in GALLON PER HOUR..

2) Do you have numbers from the past as to fuel burn at these RPM’s?

3) Did the engines ever each make 2300+RPM and make it easy?

4) Exact model/HP of the QSM you have.Post serial numbers.

5) Post pictures of the engine from all around

6) History of the engines and the history of your use of the engines

7) are you testing with a “sync” on?

Start with these 7 items–We need lots more information, but you have not provided anything to help at this point.

Tony

[Author]

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