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  • #16
    Briggs

    Actually the ideal man would be Bill Collis .. his career/contracts in last 20 years have all been ECU programming, for most of the big motor companies. Not really my area of expertise, however.

    Mike

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    • #17
      Briggs

      Here's a photo Steve U sent over of the Viper V-Twin from Paul Bailey, installed in a Flylight trike

      Apparently 30kg or 10 kilos less than the Briggs, so suits the lightweight end extremely well

      Wonder what price?

      Cheers

      Kev

      Attached files
      G-KEVA
      BMAA 5696

      "If anybody ever tells you anything about an aeroplane which is so bloody complicated you can't understand it, take it from me: it's all balls."

      R.J. Mitchell :- Designer of the Supermarine Spitfire

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      • #18
        Briggs

        Does look nice. Hopefully it's easier to start than the single-cylinder.

        Mike

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        • #19
          Briggs

          Just received a set of photos from an American Aviator; my camshaft broke after 160 hours, and the replacement has been reinforced using a steel bar down the core, an idea stolen from Precision Cams in the USA, apparently they always beef them this way to cope with high lift and stiffer valve springs.

          The reason for sharing this knowledge is in the hope of getting some back; this guy has decided to go for the Rolls-Royce option and paid $350 for a billet steel camshaft, instead of the reinforced cast iron version. Mike Edwards at Precision Cams has also matched the profile to make power at cruise rpm of 4000-4500, instead of screaming 6000 plus

          Hope this useful

          Kev

          Attached files
          G-KEVA
          BMAA 5696

          "If anybody ever tells you anything about an aeroplane which is so bloody complicated you can't understand it, take it from me: it's all balls."

          R.J. Mitchell :- Designer of the Supermarine Spitfire

          Comment


          • #20
            Briggs

            Kev, I have been keeping an eye with keen interest on your progress regarding the Briggs. Since liquid nitrogen is reasonably easy to obtain would an alternative to Loktite be to drill the camshaft to achieve a small interference fit with the steel insert. soak the insert in liquid N2, warm the drilled camshaft then fit the insert. Gizz an update on things if you have time.

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            • #21
              Briggs

              True Bill

              However my ambition is to create an engine suitable for SSDR, that has long term durability and tight fuel consumption compared to the two strokes currently ruling the roost, but feasible to assemble for anyone with just enough technical know how to decoke a small motorbike.

              So far it has been reasonably successful; the exhaust is easy enough if you know of or have a welder, assembly of the engine is staggeringly simple as it is designed for Third World maintenance in a field, and you can totally strip the thing without special tools, and re assemble with a standard socket-set and torque wrench. The unit is heavy but as SSDR is 300 kilo now it is even more viable.

              So the option I'm testing with the 11mm ground silver-steel rod (off the shelf via eBay) pushed into a close fitting hole drilled into the middle of the camshaft, and secured using specialist Loctite 622 looks the most straightforward; it was pretty easy to do and can be sorted with a standard cheap B&Q pillar drill and 11mm drill bit. for follow-on builders I'd recommend either the iron with steel rod up centre, or billet steel version bought straight from Precision Cams in the USA. At $350 this should be bombproof.

              They take credit card and post to the UK.

              All the other bits of the motor display no problems at all provided you stick with the cooling fan and shroud, brace the top of the engine to the airframe and add a couple of electric Suzuki heater plugs local to the carb butterflies. Americans use them all the time now.

              Cheers

              Kev
              G-KEVA
              BMAA 5696

              "If anybody ever tells you anything about an aeroplane which is so bloody complicated you can't understand it, take it from me: it's all balls."

              R.J. Mitchell :- Designer of the Supermarine Spitfire

              Comment


              • #22
                Briggs

                [quote=John Penry-Evans]

                It is a specialist area of engine tuning on these engines, not to be tackled by an amateur.

                ? ;-)

                I'm reasonably handy with tools but only ever served time as a Factory Maintenance Fitter; Brian Fallows is handier but has a similar background, he's flying one too successfully he built himself.

                Folk like Simon Worthington and others would laugh at the simplicity of these motors, no water-cooling pipes, and the crank-mounted fan means not even a fan belt to worry about.

                The crankcase is so oversized for easy access it feels like you can crawl inside, and the cylinders are cast in with the crankcase, so no base gasket to leak.

                My pusher can be stripped right to crankshaft out without removing from the trike, if it wasn't for the fact that the case was damaged I'd have repaired and flown it without.

                And John's reduction drive is just four bolts to attached and belt to set up

                Easy

                Kev
                G-KEVA
                BMAA 5696

                "If anybody ever tells you anything about an aeroplane which is so bloody complicated you can't understand it, take it from me: it's all balls."

                R.J. Mitchell :- Designer of the Supermarine Spitfire

                Comment

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