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Thread: ESE's works engine tuner

  1. #31831
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    21st March 2014 - 22:00
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    Quote Originally Posted by peewee View Post
    hey guys on the yami twin theres a small hose from the head to top of rad. im guessing this is a self air bleeder like the bleeder screw found on most other heads. what im not sure of is if its only purpose is just for the first time the system is filled and after that its useless. ?
    And during cold start, when the thermostat is still closed, it might reduce a bit the water pressure when slightly reving up the engine...?

  2. #31832
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    3rd May 2017 - 04:03
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    Quote Originally Posted by TZ350 View Post
    Thank you for the Patent's. It tells me a lot about where things are at currently.

    Some of the ideas are close to mine. Reading what they claim and based on my experience I doubt any of them have a working example.
    Stihl and Husqvarna both sucseed in fuel injection on disk saw STIHL TS 500i
    This year they will start STIHL MS 500i
    What ideas and algorithms used unclear. Both companies have few EFI related patents...
    May be good idea reverse engineer one of those EFI ?

  3. #31833
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    25th March 2004 - 17:22
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    So, . . What sort of throttle response is required on a saw?
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  4. #31834
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    13th June 2010 - 17:47
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    Quote Originally Posted by F5 Dave View Post
    So, . . What sort of throttle response is required on a saw?
    Suburbanite....Response should be at least equal to the best bikes, preferably better. With no flat spots or hesitancy.
    Instant return to a steady idle is a prerequisite too.
    I will no longer see PM's on this a/c. If you wish to PM me, use grumphv2 a/c please - and include an email address if you require a reply.
    Thanks

  5. #31835
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    The VF2 was not designed for the NF4 , it was a CR125 part that also fitted the TM125MX.
    But it made better power than the NF4 reeds and way better than the later VF3.
    In the race bike the outers hit the case .
    The petals are too thin , and the 1st mode resonance is too low for running to over 12,000 all day.
    I got Tassinari to make special petals with biased carbon weave , that solved the issue running a TM125MX to 13,000 all day.
    Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.

  6. #31836
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    7th September 2009 - 09:47
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    Quote Originally Posted by F5 Dave View Post
    So, . . What sort of throttle response is required on a saw?
    Instant!!!
    ..................

  7. #31837
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    18th May 2007 - 20:23
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    Click image for larger version. 

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    Quote Originally Posted by jbiplane View Post
    Stihl and Husqvarna both sucseed in fuel injection on disk saw STIHL TS 500i This year they will start STIHL MS 500i What ideas and algorithms used unclear. Both companies have few EFI related patents... May be good idea reverse engineer one of those EFI ?
    I would love to know more about Stihl performance, peak torque rpm, bmep etc; and anything about Stil's EFI and how they arrange the injector(s).

    My own experience has lead me to believe that you can successfully fuel inject any two stroke using the common Alpha-N topology. Unless the motor is heavily reliant on symbiotic pipe resonance for its power, like a Honda RS125 or Aprilia road racer. Because when you throttle off, the pipe resonance collapses and so does the airflow. Current 2S EFI systems don't cope well with dramatic changes in pipe suction.

    Currently there is no proven method I know of that can detect this change of airflow in a high performance single cylinder racing two stroke. So you get very poor EFI throttle response with racing single cylinder two strokes that are producing more than 10 bar BMEP. Anything less than 10 bar BMEP should be relativly easy to fuel inject and get good throttle response. The lower the BMEP the easier it will be to fuel inject successfully. And because it's a time thing, over 9-10,000 rpm you will also need staged injection.

    I expect exhaust pipe induced air flow does not change much in industrial two strokes, making it much easier to map the industrial 2S EFI for good throttle response.


  8. #31838
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    20th January 2010 - 14:41
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    Quote Originally Posted by F5 Dave View Post
    So, . . What sort of throttle response is required on a saw?
    Hand in Your Kiwi Bloke id immediately. Anyone lucky enough to have ever seen Ron Hartill use one to carve stuff you would know what a Chainsaw can do.

    In the Bloke code its written Most blokes would rather lend out their wife than their Chainsaw.

    They also need to work on any angle or way up, thats why they have a pumpercarb. Like a KT100S



    Kinky is using a feather. Perverted is using the whole chicken

  9. #31839
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    25th March 2004 - 17:22
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    Well funnily enough I'm in turangi cleaning out dads Bach of 35 years. I've left behind a realatively new McCulloch chainsaw . I'd just rather use a lithium saw. Too scared of chainsaw.
    As far as the Kiwi man card goes, tell them to turn up with 2 slick shod 50cc racers and see of they can beat me around any track despite my doting years
    Good luck with that.
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  10. #31840
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    Quote Originally Posted by F5 Dave View Post
    Well funnily enough I'm in turangi cleaning out dads Bach of 35 years. I've left behind a realatively new McCulloch chainsaw . I'd just rather use a lithium saw. Too scared of chainsaw.
    As far as the Kiwi man card goes, tell them to turn up with 2 slick shod 50cc racers and see of they can beat me around any track despite my doting years
    Good luck with that.
    Can you beat Av?



    Kinky is using a feather. Perverted is using the whole chicken

  11. #31841
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    Quote Originally Posted by F5 Dave View Post
    So, . . What sort of throttle response is required on a saw?
    Stihl report chain acceleration from 0 to 100km/h for amazing 0.25 seconds

  12. #31842
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    12th February 2004 - 10:29
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    I don't know, but I suspect there will be a centrifugal clutch in there somewhere. So - engine revs to ??,000rpm and then clutch grabs. The engine doesn't pick up that fast, just the clutch.

  13. #31843
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    25th March 2004 - 17:22
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    And further not what speed of acceleration but how controlled?
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  14. #31844
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    25th March 2004 - 17:22
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    Quote Originally Posted by husaberg View Post
    Can you beat Av?
    I might have had a drink last night and been spouting bile.

    If we can change the question to have I beaten Av before? Yes. When she was a kid. On occasion I've also beaten Jay and Sketchy and a whole raft of other teenagers (who grew up and would now wipe the floor with an old man).
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  15. #31845
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    18th May 2007 - 20:23
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    Quote Originally Posted by jbiplane View Post
    Stihl report chain acceleration from 0 to 100km/h for amazing 0.25 seconds
    Quote Originally Posted by speedpro View Post
    I don't know, but I suspect there will be a centrifugal clutch in there somewhere. So - engine revs to ??,000rpm and then clutch grabs. The engine doesn't pick up that fast, just the clutch.
    Agreed, it is all about the clutch. Idle speed is 2,500 rpm so the flywheel inertia at whatever speed the clutch takes up would accelerate the chain quite quickly. Still amazing though, and frightening.


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