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Thread: Whats the bore and stroke of 78 cm^3 bikes

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    Default Whats the bore and stroke of 78 cm^3 bikes

    hi
    can anyone tell me with certainity Whats the bore and stroke of 78 cm^3 bikes like doom habib etc,,
    also heard that they accept honda cd 70 piston and rings...? is it true?
    what piston and rings they accept?


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    Default

    Quote Originally Posted by asjdsm View Post
    well guys i checked the bore and stroke of dhoom it comes out to be
    bore=46.8mm
    stroke=50.9mm - 50.3mm
    as u see the stroke is at least 49.5mm the values obtained above it are due to the domed sized of piston and a small circular depth at the centre of piston ,, reading were taken at different pointd from piston ,, those taken at the higher place of piston gave 50mm and at lowe places of piston the readings were51.3

    the stroke was calculated as it should be .. at TDC the piston was approx 2.05 to 2.3mm below the cylinder top face .. and definitely stroke was not calculated as the depth from the top of cylinder rather as from the top of the cylinder where the piston surface lies at TDC..

    so the end result is the 78cc labelled engines are not actually 78cc but 88cc... proved..
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    Default

    my dhoom is confirmed 88cc and so it is doom,,
    the problem may be due to its camshaft design and the pathetic 15.5 m carb,,,i made a new thread use that please for further discussion the basic question posed by this thread is answered,,

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    Whots ur thread's name?
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    Thanx.
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    Exclamation

    Quote Originally Posted by asjdsm View Post
    goot the specs of super star 70cc from their website,, its bore and stroke are as follows

    Bore * Stroke 47 mm * 49.5 mm .... making it 85cc bike..
    Super Star Motorcycles
    How can u say that it is 85cc? Means how u calculated it?
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    using equation ,, i pointed in the thread
    https://www.pakwheels.com/forums/bik...her-90cc-bikes to ur reply thread 4

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