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appreciated but I think you are describing medium-speed Truck type diesels not the locomotive type.
...... Diesel's run wide open and engine speed is determined solely by the amount of fuel being injected.
Chris,
I was describing all diesel engines, I'll clarify. As you probably know gasoline engines whether they be carburetor or fuel injected have a throttle plate in the intake metering the amount of air allowed into the engine which then determines the amount of gas going in. The engines speed is governed by the opening of the throttle plate in the intake. Diesels have no such device for air control, its wide open, all the air, all the time. The amount of fuel injected per stroke determines engine rpm.
Hence the need for a governor to control the amount of fuel being delivered to maintain a set rpm. I just glanced over the woodward governor link you provided, I remember the first fuel shop I worked at talking about those but never had the pleasure to actually lay hands on one. Or displeasure based on the stories. Probably later on I'll be able to tell stories to the new kid about what a nightmare VG turbos were in the early days and tier 4 emissions and diesel exhaust fluid, particulate filters egr and and and, tier 5 is on the way, cant wait! I can't imagine the size of the DEF tank on a locomotive......