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 - Women and Tractors - by Teri Burkholder. The View from the Garage - Never a doubt, everything on our farm is a learning experience. I've been working very hard to get our two rundown Farmall A's sanded, primed , bondo�d, fiberglassed and painted before our big local tractor show called the Tulip Festival. My husband Ben came in the garage one rainy day to see if he could "help". Well if you knew Ben you wouldn't want him anywhere near your spray gun, fiberglass or bondo! So I pulled out the 2 old yucky looking magne
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