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Thread: virage 1200

  1. #1

    virage 1200

    Can I bore just one cylinder on this engine two are perfect one is scored if so how much . Its the center one which was burnt up I think because of detonation if so what would correct the problem Thanks Ed Ps no water in gas or engine


  2. #2
    Bernie's Avatar
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    No .All cylinders must be the same capacity or the power pulses will be different and cause you issues with balance and other issues too

    Cheers

    Bernie

  3. #3
    I bored one cylinder one size over on a 1050 and ran for 170 hours with no problem. Probably depends on how much you need to over bore.

  4. #4
    PolarisNut's Avatar
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    A .25mm cleanup overbore is no biggie at all. The power difference will be miniscule at most. I personally would try not to go bigger than a .5mm over the other cylinders. I've spoken to many reputable builders, and they agree.

  5. #5

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    Benie what have you been smoking? Are you going to tell us that .010 or even .020 over size piston is going to show up on a compression test with signifigant differance? Man I ve tested lots of boats and see a fluctuation on 135 120 128 and the machine still runs awsome. Having one cyl bored will have the same effect and is not going to twist the crank or harm the engine.

  6. #6
    Bernie's Avatar
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    I smoke the tyres in my car on occasions but that is as far as it goes .The CC of the combustion area will be different .Therefore the amount of area for the combustion process to occour will be different .Therefore the amount of power produced on that cylinder will be different .This will create an imbalance in power produced /cylinder .Polaris cranks are not well known for their ability to maintain correct index .That is the basis for my comment .
    There would be ab equation for this .I will see if I can get some figures for you

    Cheers

    Bernie

  7. #7

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    Ok.....but I know that at a .020 over piston compaired to the stock one you will see 10% or less difference between the cylinders. So one at 135 psi and one at 122 psi you will not see a 25 ton crank twist like 1050 and 1200 motors. fact is why do you think rods bend and cylinders bust at the base. Because those tuff cranks just dont twist. 650/750/780 with a 6 ton press that I will give you but even then those motors would split the piston first.

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