Not near true, about gensets. The reason why many run so fast is because it is the cheapest way to build. That is, running a smaller engine near it's max.
The most pricey and fuel efficient standby gensets run very slow, at 1100 or 1300 RPM. The cheaper ones buy cheaper engines and run that at their near max.
HD Delco gensets with Detroit Diesels run at 1100 RPM. Newer four-sroke diesels powered by Cummins, Isuzu, etc. tend to run 1800 RPM.
The most efficient smaller portable gensets run even slower and match RPM to load. That is done by making DC instead of AC, running it through a full wave inverter to make AC at 60 cycles at any engine RPM.
I don't believe you're going to find test specs anywhere on any diesel engine the runs most efficient when out of it's peak torque-curve. And with most - that is 1800-2200 RPM.
A small cheap engine can be made to behave like one twice it's size - simply by runnig twice as fast. That's the cheap-way out for lower priced gensets.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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