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68C

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Posts posted by 68C

  1. I wondered about that as well, I remember folk did it with old Tonti models.

     

    I was told one problem is if a plug or one coil fails the cylinder is then running retarded with possible overheating and piston and exhaust header damage. You don't know the plug has failed, as the drop in performance will not be great, until you see the header glowing cherry red.

     

     

    I found this earlier thread by Motoguzznix.

     

     

    http://www.v11lemans.com/forums/index.php?showtopic=18850&view=findpost&p=201788&hl=%2Btwin+%2Bplug

  2. Please please keep reporting on this trip, I have only been Texas and Georgia on trips to Bell Helicopter and Gulfstream training courses. I have always fancied seeing the East coast, Oregon and California - or have I got my navigation all wrong? ANYWAYS, it would be fascinating to hear about your trip.

  3. If all V11 fuel pressures are in that region I am surprised at the wide tolerance, could be up to 13% difference and still be in tolerance. I would have thought varying the fuel map by that much would be noticeable.

     

    That is unless I have screwed up my maths, + or - 0.2 is 0.4, divide by three is 0.133r, which I take to be 13%.

     

    So I guess the fuel pressure is not super critical or a narrower tolerance would have been specified.

    • Like 1
  4. Thanks Kiwi Roy,

    I know gasses flowing through an orifice 'choke' once the flow goes supersonic and that the flow will remain constant even if the supply pressure increases. Gas turbine enthusiasts will know this idea is used to off load the engine during starting and idle

    I did not realise this also applies to fluids, makes sense now that the pressure is not that important.

    This should not be confused with Miss Shilling's Orifice.

    • Like 2
  5. Hi all, just a 'wondering about' question.

     

    As I understand it the fuel pump delivers a regulated steady fuel pressure and the ECU opens the injectors for the correct time in each cell of the fuel map to deliver the required quantity of fuel.

    This brings me to wonder how accurate the fuel regulator is, does varying temperature, battery/charge voltage affect it. If actual fuel pressute differs between bikes, how does this affect map sharing.

     

    This is just for interest, I don't suspect a fault on my bike and don't intend to fit any magic super regulator.

  6. I agree it is nice to tidy things up. They used to say if you could remove a part and the bike still worked and was legal you did'nt need it.

     

    My pet hate is bikes that have nice covers to hide some ugly component under it. Why not design it pretty in the first place? Most Japanese bikes suffer from this, look at a stripped down Yamaha, loads of thin welded on brackets and gussets that collect crap, not the easiest bike to make 'sanitary'. I know they use a lot of generic parts but they could still be attractive.

  7. Still don't understand why you want to remove this pipe.

     

    It was common to fit a LeMans Mk1 breather box to the 850T3 which let oil run back to the sump but allowed gasses to vent to atmosphere and not into the airbox, less chance of oil deposit build up on the inlet valve. The metal box was about 3" x 2" and sat between the carbs, it had an internal rubber flapper valve which ensured a low pressure in the crankcase, worked really well and lasted a long time. As the original airbox would not fit you then fitted K&N filters.

     

    I can understand if you want to reroute the pipe that goes goes to the airbox but not why you want to stop the oil running back to the sump.

     

    Of course, allowing the gasses to atmosphere has an enviromental effect which is why the OEM choose to burn them through the engine.

    rps20170331_122933.jpg

  8. And, hey, if we're dropping big names, let's  make sure Tony Foale gets the credit for the Spine Frame itself:

    tfframe.jpg

    Love the Tony Foale frame, never seen it before, I cetainly did not know he was so involved with Guzzi racers.

     

    I have a set of Tony Foale leading link forks that I believe were were for a T3 sidecar set up with the name proudly cast into the disc caliper mount arms. At the moment the lower section is fitted to my Triumph 900 outfit using homemade down tubes.

    • Like 1
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