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Thread: ESE's works engine tuner

  1. #36361
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    Quote Originally Posted by tdc211 View Post
    Frits. How's that inner radius below the case deck work?
    New yz85 is like this. I didn't know what to think about it.

    Hi i am confused Nearly every case i have seen short of a 1960 old villers/ greeves is radius below the casedeck?
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    Quote Originally Posted by Katman View Post
    I reminder distinctly .




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

  2. #36362
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    Quote Originally Posted by husaberg View Post
    Hi i am confused Nearly every case i have seen short of a 1960 old villers/ greeves is radius below the casedeck?
    Interesting - I saw the inner radius of the transfer port as the radius on the sleeve side of the port?

  3. #36363
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    Quote Originally Posted by Vannik View Post
    Interesting - I saw the inner radius of the transfer port as the radius on the sleeve side of the port?

    oh i get it (only after he actually looks at Frits pic again)

    Still fairly common




    cagiva


    YZR500


    NSR500


    Cant remember what this one was later oh KR3




    NSR or RS cant recalll


    when we were sharpening septums to razor shapeness that inner area got a radius as well
    Just like we were taught from looking at pictures in robinsons, book the sharp point kept them cool at Mach 3

    i cant remember where i seen it but there is an odd looking bump in the unmentionable RSW500.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




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

  4. #36364
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    Quote Originally Posted by tdc211 View Post
    Frits. How's that inner radius below the case deck work?
    New yz85 is like this. I didn't know what to think about it.
    I'm not sure I understand your question. Do you mean the radius indicated in the picture below?
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  5. #36365
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    Quote Originally Posted by Frits Overmars View Post
    I'm not sure I understand your question. Do you mean the radius indicated in the picture below?
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    Yes i think he means this bit Frits with the inner radus continues lower than the machined deck height of the cylinder. (Thanks for correcting me Neels)

    Now i am going to spend an hour looking for that the weird looking protrusion on a RSW500.

    okay 27 minutes
    Any ideas re the shapes of this
    It looks nothing like any of the other Aprila or Rotax tranfers in design
    it almost looks like a different guy did designed the inner side than the outer sider?

    Was it just as they tried to use the skinny 250 case?
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




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

  6. #36366
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    While were at it, I’m curious about this double radius:

    What is the reason for “step” and radius change at case deck?

  7. #36367
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    Quote Originally Posted by husaberg View Post
    Now i am going to spend an hour looking for that the weird looking protrusion on a RSW500. okay 27 minutes
    It looks nothing like any of the other Aprilia or Rotax transfers in design. it almost looks like a different guy did designed the inner side than the outer side? Was it just as they tried to use the skinny 250 case?
    You're spot-on about a 'different guy' Husa.
    The RSW500 was the brainchild of Aprilia's then-technical director Jan Witteveen. It was an extremely-short stroke engine and Jan Thiel did not want anything to do with it.

  8. #36368
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    Quote Originally Posted by sniemisto View Post
    While were at it, I’m curious about this double radius:

    What is the reason for “step” and radius change at case deck?
    This was a case of mutilating a new cylinder design because it had to fit old-type crankcases. You also see it quite a lot on aftermarket big-bore cylinders.

  9. #36369
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    Piston at bdc. ktm cylinder next to it
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  10. #36370
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    Quote Originally Posted by Frits Overmars View Post
    This was a case of mutilating a new cylinder design because it had to fit old-type crankcases. You also see it quite a lot on aftermarket big-bore cylinders.
    This is particularly bad...
    This is the main cause why big-bore cylinders usually give diappointing power....
    The transfers become too small!!

  11. #36371
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    Quote Originally Posted by Frits Overmars View Post
    I'm not sure I understand your question. Do you mean the radius indicated in the picture below?
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    This radius gave about 0.4HP more...

  12. #36372
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    Quote Originally Posted by husaberg View Post
    Yes i think he means this bit Frits with the inner radus continues lower than the machined deck height of the cylinder. (Thanks for correcting me Neels)

    Now i am going to spend an hour looking for that the weird looking protrusion on a RSW500.

    okay 27 minutes
    Any ideas re the shapes of this
    It looks nothing like any of the other Aprila or Rotax tranfers in design
    it almost looks like a different guy did designed the inner side than the outer sider?

    Was it just as they tried to use the skinny 250 case?
    This engine was a complete failure, best power was, of course, reached when it was finally enlarged to 500cc....
    I still don't understand why they needed 5 years to discover it....................
    It just shows how little they understood about engines!

  13. #36373
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    Quote Originally Posted by Frits Overmars View Post
    You're spot-on about a 'different guy' Husa.
    The RSW500 was the brainchild of Aprilia's then-technical director Jan Witteveen. It was an extremely-short stroke engine and Jan Thiel did not want anything to do with it.
    Enlarging a 250cc engine proved to be a totally wrong idea....
    Of course the short stroke engine was always short of power.
    And when it was finally enlarged to 500cc the gearbox broke....
    Small wonder, as it was basically made for a 125
    The 250cc tandem used already the 125 gearbox, sometimes broke..
    I still think a well-made 500/2 could have won!!!!

  14. #36374
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    Quote Originally Posted by Frits Overmars View Post
    You're spot-on about a 'different guy' Husa.
    The RSW500 was the brainchild of Aprilia's then-technical director Jan Witteveen. It was an extremely-short stroke engine and Jan Thiel did not want anything to do with it.
    Quote Originally Posted by jamathi View Post
    Enlarging a 250cc engine proved to be a totally wrong idea....
    Of course the short stroke engine was always short of power.
    And when it was finally enlarged to 500cc the gearbox broke....
    Small wonder, as it was basically made for a 125
    The 250cc tandem used already the 125 gearbox, sometimes broke..
    I still think a well-made 500/2 could have won!!!!

    Cheers Frits and Jan



    https://www.honda.co.uk/engineroom/w...the-honda-nsr/

    I read this today on Hondas own page
    Now i never worked at HRC
    But i do know the RS500 never had two cranks or Disc valves.
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    Nor did the Switch to unleaded make it needed to be switch back to 180 crank.
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    One often over looked advantages of the 3 was it had a lot f room for wide swept transfers as well as full width cadges as did the Single cranked NSR500.
    Of course the Tandem and the cranked tandem Aprilia had this room as well.
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    I seems Honda has forgotten.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




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

  15. #36375
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    Always thought a 500VTwin would make a cracking roadbike in the 90s. . . . If only someone made one. . . .
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