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Mass of burned gas and unburned gas during compression stroke

  1. Jul 2, 2013 #1
    During the compression stroke,before combustion, it seems that the mass of the burned gas and unburned gas are equal.(-so my book ICEngines by Heywood states). Why is this?

    By unburned gas here, one means the nascent injected fuel-air mixture during the intake stroke.
    By burned gas here, one means the product mixture left over from the previous combustion stroke+the EGR intake gas.

    I can't see why the author would cite such a statement. By law of conservation of mass,where mass of products=mass of reactants, this would not hold for a chemical reaction taking place in different strokes, would it?
    (the statement is also given in the last page of the attached pdf file).
     

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    Last edited: Jul 2, 2013
  2. jcsd
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