JD, there's no such thing as an engineering decision that isn't a compromise. Sure, you can run this particular engine slower than 3000 rpm and get better specific fuel consumption. The chart says so. But then the genset builder would have had to derate the generator, since less horsepower is on tap at the lower speed. To get the same horsepower at the lower speed would require going to a bigger engine, which adds both weight and cost.
Taking your argument to its extreme, we should still be running Fairbanks-Morse generator sets from the 1920s, since they are very slow, reliable and efficient. But you can't put one in the back of your pickup and you can't buy one at Home Depot for 500 bucks.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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