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Diebythereaper

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    Compression Ratio for new build big bore motor - Long term with new fuel - 12:1 ??

    in Oil Cooled

    Posted

    Now that's a well thought out reply Sandman and thank you! I am concerned about detonation with our ever changing fuel situation which will continue to change, from what you are saying them I will be fine with whatever I do.

    I mentioned the Dyna deliberately as I knew people would say Ignitech, thing is I have a Dyna on the shelf for this build for years and they are fine. I don't need to chase every last hp out of the engine I just want something I can work on and use myself.

    • Like 1

    Compression Ratio for new build big bore motor - Long term with new fuel - 12:1 ??

    in Oil Cooled

    Posted

    Hi guys,

    With our ever changing fuels and more coming I am currently doing a big bore Gsxr motor for a road project and want to know what is the best comp ratio to be aiming for?

    I know in the past we could do 12.5:1 and run good fuel and it will be fine but I don't have that option - Where I am the only choice is what is in the pump (currently E5 and prob E10 on the way) and no high octane unleaded or any of that.

    Does 12:1 sound like a good goal for regular petrol or should I go lower? I honestly don't know

    thanks

    martek ?

    in Trick Frames

    Posted

    Polish with autosol/belgom/ whatever then seal with two coats of good carnuba car wax (pay for it) and then keep frame out of a damp shed 

    When ride and it gets wet and you get home blow it off with an airline and wipe dry with a cloth and away you go

    If you leave the water sitting on the frame it will "pit" it when it corrodes

    All the joys of owning an aluminium tubular frame, if it is not for you then maybe sell the bike on but do not powdercoat or anything that cannot be easily reversed - just my two cents from having owned one for many years

    • Like 1

    Turbo cam timing

    in Forced Induction

    Posted

    Timing marks on the cam sprockets are more often than not out a little - Lee Workman did a few great articles in Streetfighters mag years ago on cam timing and how to dial in oil cooled engines - 110 degrees is a great setting for Gsxr/bandit engines to get power higher up in the rev range as thats what these engines are designed for N/A - It is hard to beat even on a turbo so I would recommend this timing also.

    loominum arm

    in Trick Frames

    Posted

    Thanks for sharing all the photos Yan, its great to see how it is actually done, very very impressive! As soon as I learn to weld aluminium I am coming to your place for some lessons on this! :-)

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