A diesel engine draws the same volume of air per cycle, regardless of the engine rpm. Typically, a diesel engine will draw approx 100 lbs of air for every lb of diesel fuel. At full speed this drops to about 20 lbs per lb of fuel. This is due to the fact that there are no throttle plates on diesel engines. Compared to gas engines, which has a throttle plate, placed across the intake manifold, and this regulates the amount of air available for fuel combustion.
Its the absence of this throttle plate that allows a large amount of air to be drawn into the diesel engine at low speed. This very large amount of air is also the reason why diesel engines can be idled for long periods of time with very little fuel used (not recommended for climate change purposes), unless necessary. There is nothing wrong with that. For more info, read "How To Repair Diesel Engines" by Paul Dempsey.
With a good diesel engine and rebuilt pump and injectors, this engine will work for years on end without any problems. The reason why there are many points, plugs and other parts is that they need to be changed regularly.
This post was edited by ontarioparts at 21:39:12 12/19/09.
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