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Steve wrote: Sport Pilot wrote: Diesel fuel is not conducive to high speed running. Nor is a long injection period through much of the expansion phase. Yes you can boost the turbocharger and the other things, but an Otto cycle engine will respond with even higher speeds. Parts failure from speed is not a problem with diesel engines, the rotating parts have to be bigger than an otto engine because of the higher compression, yet the otto engine will turn higer RPM's with smaller parts. All of the above is true in the common practice of diesel design, but none of it is necessarily true. There is nothing FUNDAMENTAL that limits a diesel to low-RPM designs only. One can build a screaming high-RPM diesel with light-weight rotating parts, but one would have to ask "why?" Gasoline engines are made high-revving in order to increase power output from a small package, but diesels can develop a lot more low-RPM torque through high boost because they don't detonate when "lugged," so there's no NEED to make them scream. If you need more power, don't spin them faster, just boost them harder. High RPM is an aggravation, not an advantage (no matter what Honda VTEC drivers think...). Actually diesels don't really deliver that much torque at similar speeds. Ok they do but only because the valving is timed for the slower speeds. Many gasoline tractor engines will diliver similar torque, but with a higher fuel consumption due to the lower compression ratio. Diesel fuel burns slower and will knock when the injection timing is shortened to allow higher speeds. |
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