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Thread: ESE's works engine tuner

  1. #32251
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    12th March 2010 - 16:56
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    Here is a 60.5mm piston, not finished outside. Thats why there is a lump on its head, to hold on to, to do the cut aways and piston ring groove. Material? magic.
    https://youtu.be/MxyTBXiaFQw

  2. #32252
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    https://youtu.be/MxyTBXiaFQw
    60.5 mm piston, clearly not outside finished yet.

  3. #32253
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    What sorcery is hiding in here?......

  4. #32254
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    12th March 2010 - 16:56
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    tried to put up a video but won't take.
    So here is a picture instead, my new 175 piston, 60.5mm
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  5. #32255
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    7th October 2015 - 07:49
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    Thanks Wob very much about this info, maybe we must to rise C before Europian final round
    You are right, for accurate comparison test we must found right cylinder height for std piston and from this point start to test with rounded. But its even more pain.

    Usual modification route is-
    Work with bottom end (crank, crankase) then testing
    Work with cylinder, then testing
    Rounded piston, then testing

    Add photo with another modification on C, crankcase step, its mimic to hydrodiode , we do this on SX50 and World Cup SX65, but still blind zone.
    Maybe this coud help with full rounded piston, but we not tested.
    I think for all of us would be very interesting to see your work results with sharp edge at C on much higher revs and power output engines than MX.
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  6. #32256
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    Quote Originally Posted by katinas View Post
    Thanks Wob very much about this info, maybe we must to rise C before Europian final round
    You are right, for accurate comparison test we must found right cylinder height for std piston and from this point start to test with rounded. But its even more pain.

    Usual modification route is-
    Work with bottom end (crank, crankase) then testing
    Work with cylinder, then testing
    Rounded piston, then testing

    Add photo with another modification on C, crankcase step, its mimic to hydrodiode , we do this on SX50 and World Cup SX65, but still blind zone.
    Maybe this coud help with full rounded piston, but we not tested.
    I think for all of us would be very interesting to see your work results with sharp edge at C on much higher revs and power output engines than MX.
    I have lowered C port openings with epoxy. Maybe fully Radius piston and epoxy lowered C.

    Entrance of C wider than cases works good. Any benefit from A and B entrance wider than cases?

  7. #32257
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    6th February 2016 - 06:52
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    Quote Originally Posted by jonny quest View Post
    I have lowered C port openings with epoxy. Maybe fully Radius piston and epoxy lowered C.

    Entrance of C wider than cases works good. Any benefit from A and B entrance wider than cases?
    Have wondered this myself...

  8. #32258
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    7th October 2015 - 07:49
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    Quote Originally Posted by jbiplane View Post
    Thanks for responce. The more information is on producer site.
    http://sibaero.ru/%d0%b4%d0%b2%d0%b8...-sibaero-2r-i/
    I nether see this engine working, only read information on Russian amateur aviation forum. Both cylinders are working (have the same themperature).
    Hi,
    On parallel two cylinders air cooled engines, aviators use isolation plate between cylinders to lower and maybe equalized cylinders temperature for both transfers sides. Without plate engine lost power.
    Maybe this help.

  9. #32259
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    Quote Originally Posted by jonny quest View Post
    I have lowered C port openings with epoxy. Maybe fully Radius piston and epoxy lowered C.

    Entrance of C wider than cases works good. Any benefit from A and B entrance wider than cases?
    Yes, on dyno entrance of C wider than cases add something on reed engine, but with rotary or piston ported maybe all goes in different way.

    Minarelli scooter engines made with big step, aprox 3mm at A ex side wall and case.
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  10. #32260
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    DB Errors have been fixed. You can now view the thread images again.
    Zen wisdom: No matter what happens, somebody will find a way to take it too seriously. - obviously had KB in mind when he came up with that gem

    Artificial intelligence is no match for natural stupidity

  11. #32261
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    8th February 2007 - 20:42
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    Katinas , I am tuning for a team in OZ champs till next week , but as soon as I am back I will try C duct step ( sides only first , then all 3 edges ).
    Its a test I can do back to back on the dyno in probably 1/2 an hour , so really worthwhile if a sucess , no drama if its no use.
    I have a new piston from Vertex to test with angled squish only - then flat top.
    Once I have done this is I will CNC that piston with radius to test again , but with a sharp C edge and test C height as well.
    As I said , with full radius the front side power was very good - exactly what you want in MX.
    But using a radius with sharp C and dropping the cylinder essentially makes the C lower in timing - again good for front side power.
    I am hoping that dropping the cylinder and grinding up the C with the sharp edge will give more everywhere - including into the overev.
    Bastard 2T will make a fool of me im sure , but I have to try it.
    I think if you add big ball nose radius on the duct entry wall you will see a gain - worth over 1/2 Hp in the kart engine.
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    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.

  12. #32262
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    7th October 2015 - 07:49
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    Thanks you Wob for your clear reference.

    Actually for World Cup we send boy with two reverse restrictions in C port (add sketch blue color where was grinded) because KTM 65 cylinder is relatively high. With shorter cylinder, shorter Lc, and just one step on case is enough. On dyno with 65 this add 0,3 hp with better midrange. We use grinded spark plug that Jan and Frits recommended and this again add mid range. But very interesting, it looks like plug works one number cooler that before grinding, maybe better flush..
    At World Cup boy was only one, in the whole group, with std. KTM exhaust pipe, but for us it works very well.

    But Lotte van Drunen, what a ride !!! She won both starts, amazing.
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  13. #32263
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    8th December 2014 - 14:39
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    c port

    Katinas
    Did you test with just the overhang and then test with just the hydro diode. I wonder why the use of hydro diodes are not used on all the transfer passages for reversion? I also wonder if the placement of the diode makes a difference?

  14. #32264
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    3rd August 2012 - 02:39
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    22 hp

    cil. std. only exhaust port and aux. ports
    And pipe
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  15. #32265
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    Quote Originally Posted by dutchpower View Post
    22 hp

    cil. std. only exhaust port and aux. ports
    And pipe
    Yes this is Lotte. Congratulations for all team.

    22 hp amazing, but how high is rpm.

    Best what we see on our dyno 18.21 hp at 10861 rpm.

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