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Discussion in 'Electronic Basics' started by [email protected], Mar 8, 2007.

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  1. Guest

    1)what are the chemical reactions for the combustion of
    octane( assuming that the gasoline is octane)?


    2)
     
  2. Why are you asking a chemical question in a newsgroup about electronics?

    At least you caught yourself before posting the second homework question.

    Michael
     
  3. Lord Garth

    Lord Garth Guest

    Complete combustion results in CO2+H2O but then again nothing is perfect.
     
  4. cdd

    cdd Guest

    ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

    CDD- Yes this is the wrong place for this Question But as for the
    above answer
    complete combustion of a hydrocarbon does not give H2O as an
    end
    product more like if motor is running rich -high carbonmonoxide-CO
    output-- proper fuel mixture
    means an increase in CO2 output -octane is not gasoline it is an
    aditive used to stop
    preignition. without it your engine would try to diesel when hot or
    when a high compression
    engine is used.Although this doesn't answer your question I have
    trouble understanding what it is you want to
    know. did you need to know the exact chemical/thermal and explosive
    reaction of an internal combution engine or
    ???????????????????????
     
  5. sparky

    sparky Guest

    Why would you assume that gasoline is octane ?
     
  6. Nope. Octane is a hydrocarbon, C6H18. It exists in several isomers, one
    of which 2,2,4 trimethylpentane, is the reference standard for rating
    gasolines for knock resistance. To rate a batch of gasoline, a test
    engine was run on various mixtures of 2,2,4 TMP and heptane until it
    knocked as much as on the fuel under test. The percentage of octane in
    that mixture was the rating. Maybe you're confusing octane with the
    tetraethyl lead that was once used to boost the octane rating of gasolines.

    Perfect combustion of any pure hydrocarbon gives carbon dioxide and water.
    The problem is that, in an engine, the fuel doesn't have time to burn
    completely. There is also the problem of nitrogen oxides. The way you
    reduce the oxidation of nitrogen in the engine is to lower flame
    temperatures with exhaust-gas recirculation, but that makes the
    incomplete combustion problem worse. The patch for that was the
    catalytic converter, which burns up the unburned gasoline in the exhaust
    system.
     
  7. jasen

    jasen Guest

    octane is C8H18 and is usable as gasoline. pure octane has an octane rating
    of 100. typical gasoline is a blend of hydrocarbons
    high compression engines typically stop dieseling by cutting off the fuel
    suply

    Bye.
    Jasen
     
  8. cdd

    cdd Guest

    Havn't found one of those on my twin 650 holleys-sorry (yes I do now
    what you mean-
    solinoid on the primary circuit of carb)

    correct me if wrong but I thought the byprodicts of a running endine
    were

    Carbon Monoxide CO In complete chemical combination
    of carbon
    from fuel and
    atmosperic oxygen.

    Carbon dioxide CO2 Chemical combination of carbon
    from fuel
    and oxygen.

    hydro carbons HC unburnt fuel

    water H2O Chemical combination of
    hydrogen from fuel and
    atmospheric
    oxygen

    Oxides of nitrogen NOx* Chemical combination of
    atmospheric nitrogen and oxygen
    at high
    temperates.

    nitrogen N2 Atmospheric nitrogen
    which has not reated chemically
    with other
    products

    Sometimes
    Lead PB lead particles from
    fuel anti-knock additives

    well as far as I can remember it goes something like this-If not
    please enlighten me?



    thank's

    cdd
     
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