If the compressor is currently being operated with a 25HP motor. Then the compressor only requires 25-27.5 HP to run steady state. Where the confusion arises is that a 25HP electric motor can make 50-60HP for brief periods of time. While these brief demands can be handled with the electric motor. These overloads will bring a 25HP gas or diesel to a quick stall. Hence a 40Hp minimum diesel engine with good torque rise is required to replace a 25HP electric motor. This will handle a brief torque demands a "50HP" peak load requires. A 40-50HP turbo diesel will loaf along at 25HP burning less fuel than a 50HP natural aspirated diesel. The turbo engine doesn't pump extra air when it isn't required. Being it's a reciprocating compressor that is always spinning at 100% speed. There is no real surge when the unloaded calls for air. Compared to rolling a reciprocating compressor from 0 to full rated rpms. 40HP is lots and 50HP is wasting fuel. A 25HP diesel running a max output with a wee trace of black in the exhaust. Will burn less fuel than a 50HP diesel on the same 25HP load. Ask jdemaris to backup the data.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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