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Flooded engine

Asked by: 2083 views Aircraft Systems

Greetings! i was wondering when we undergo flooded engine caused by overpriming , why we start engine with throttle - full open before re- start. and why we mixture cut-off  

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1 Answers

  1. John D Collins on Oct 13, 2013

    With a flooded start, the mixture is by definition way too rich. There is likely to be whole fuel in the cylinders. For an engine to start, the mixture must be in a certain range, much leaner than the flooded condition. By opening the throttle, you are adding the maximum amount of air and by having the mixture at idle cutoff, no more fuel will be put into the flooded engine. Eventually as you crank the engine, the fuel in the engine will reduce as more air enters the cylinders and combines with the previously available abundance of fuel. When the mixture reaches the range needed for combustion, the engine will start and run until the fuel is exhausted. Once the engine starts, you have to retard the throttle and advance the mixture to keep it running.

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