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Why don't diesel locomotive engines knock?

  • Or can you just not hear diesel locomotive engines knock?

    Thanks!

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  •    I can't answer your question, but if you post it in the Locomotives section in the Trains Magazine forum, there are knowledgeable people that can help you.   Since this forum is titled Trains.com, it seems like it would be the place for general discussion, but it is not.   Most of the general discussion is in the Trains Magazine forum.   Good luck.

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  • Fuel knock in gasoline engines is caused by the fuel-air mixture being ignited by two sources= the spark plug, nd the heat of compression.  In a diesel engine, there is no fuel-air mixture, just air. The air gets hot when it is compressed, and the fuel is injected into the cylinder at the proper time and burns on entry.

  • steemtrayn
    Fuel knock in gasoline engines is caused by the fuel-air mixture being ignited by two sources= the spark plug, nd the heat of compression.  In a diesel engine, there is no fuel-air mixture, just air. The air gets hot when it is compressed, and the fuel is injected into the cylinder at the proper time and burns on entry.

    The physical size of locomotive diesel engines absorbs much of the 'knock' that is heard in automotive style diesels whose engine have much less mass.  Secondly the sounds of locomotive superchargers and/or turbochargers mask and override other sounds.

             

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  • Because there is an air mix.