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Re: What exactly makes a diesel smoke under a load
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Posted by MarkB_MI on August 24, 2006 at 19:32:26 from (64.31.11.156):
In Reply to: Re: What exactly makes a diesel smoke under a load posted by H. Bowder on August 24, 2006 at 18:16:31:
I am aware of at least two diesel engines that have butterfly valves in their intakes: Fordson Diesel Majors and certain small Mercedes industrial and marine engines. However, the purpose of this butterfly is generally misunderstood. It does not serve as a throttle so much as it is a governor. Manifold air pressure (vacuum) activates a servo that controls the fuel pump. This system basically maintains constant manifold air pressure: When you open the throttle, the butterfly allows more air into the manifold, reducing vacuum and increasing fuel flow. Increased fuel flow speeds up the engine, increasing vacuum until an equilibrium point is reached.
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