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Class 66

Discussion in 'Diesel & Electric Traction' started by Eightpot, Jun 5, 2016.

  1. Eightpot

    Eightpot Resident of Nat Pres Friend

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    What is the bore and stroke of the 12N-710G3B engines as fitted in these locos? The only source I have found quotes 645 mm bore and 710 mm stroke (25.39" x 27.95"), which bearing in mind that the Sulzer engines as used in Class 47s are only around 11" bore and 14" stroke appears incredible. As the accepted maximum piston speed for Diesel engines is around 2000 feet per minute I find something like double that for the Class 66 dimensions to be beyond belief. Anyone know?
     
    Last edited: Jun 5, 2016
    Eightpot, Jun 5, 2016
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  2. maddog

    maddog New Member

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    maddog, Jun 5, 2016
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  3. Eightpot

    Eightpot Resident of Nat Pres Friend

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    Thanks for that, rather more sensible figures. Was wondering how they got cylinders of over 25" bore within the loco body shell, let alone in the cylinder block/crankcase!
     
    Eightpot, Jun 5, 2016
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  4. Victor

    Victor Nat Pres stalwart Friend

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    11.6 litres PER CYLINDER is pretty impressive.
     
    Victor, Jun 6, 2016
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  5. Eightpot

    Eightpot Resident of Nat Pres Friend

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    Thinking of putting one of these engines in your Jag, Victor? Might have to beef up the suspension a bit.
     
    Eightpot, Jun 6, 2016
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  6. Martin Perry

    Martin Perry Nat Pres stalwart Staff Member Moderator Friend

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    Martin Perry, Jun 6, 2016
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  7. Eightpot

    Eightpot Resident of Nat Pres Friend

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    Have found how Wikipedia got it wrong. They took the bore and stroke in millimetres, but put them down as being inches after shifting the decimal point one position to the left.
     
    Eightpot, Jul 12, 2016
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  8. goldfish

    goldfish Nat Pres stalwart

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    Have you corrected it?
     
    goldfish, Jul 13, 2016
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  9. Eightpot

    Eightpot Resident of Nat Pres Friend

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    Afraid I don't know how.
     
    Eightpot, Jul 14, 2016
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