speed engine,

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This topic contains 4 reacties, has 4 deelnemers, and was last updated by pink floyd 13 years, 10 months geleden.

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  • #144248

    pink floyd
    Topic starter
    Berichten: 45

    Hello everyone I need some help,i’m running a 46.5mm Malossi cylinder on my Bravo, but the original crankcases I had bored to 50mm are not in good shape. I would like to buy a Polini speed engine, but would the ports match the Malossi cylinder, or do I need to buy a new 46mm polini cylinder as well?

    #145743

    LeonM93
    Bijdrager
    Berichten: 154

    The ports are mainly always on the same places, but if want to tune ur cilinder by also making the boosterports match with ur engine, u will have to use a dremel anyways.
    But the prefabricated ports in a speed engine will match the cilinder’s ports.

    #145744

    ArvidW
    Donateur
    Berichten: 6259

    No, the porths won’t match. 46.5malossi uses triangular main transfer porth channels and polini uses more a rectangular shape with radius in the corners.

    You’ll have to mill the crankcase and cilinder in such a way that they match.

    Buying a polini 80 won’t solve the problem, even these transferporth channels do not match the speedengine perfectly.

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    #145745

    Edjuh
    Bijdrager
    Berichten: 6958

    They don’t match but it’ll run nice though, there’s the auxiliary ports in the piston to help get the juice from A to B.

    And as said before you can always grind your way to perfection.

    #145746

    pink floyd
    Topic starter
    Berichten: 45

    Thanks guys, I had been looking at pictures of the speed engine and I could see the port openings in the Polini crankcase were alot different to the ones in the bottom of my Malossi64.5.
    I don’t mind doing some milling, I had to do loads of work to my standard crankcase to make the Malossi ports match up good,
    but this crankcase is in a poor state and I would like to start again with a new speed engine.
    So you think it will be posible to match the Malossi to the Polini, I didn’t want to get one sent over to the U.K. and it didn’t work, shipping cost’s are high!!

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