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Thread: ESE's works engine tuner

  1. #5551
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    Quote Originally Posted by Frits Overmars View Post
    I might even lure Jan Thiel into reacting .
    Quote Originally Posted by Frits Overmars View Post
    Mental Trousers and yours truly just managed to work out a way to upload big files. Momentarily there is 37 MB of Aprilia information hovering in the cloud, waiting to be downloaded. Once you unzip it, it's over 70 MB.... And we could do the same with those other brands I just mentioned. Only if you are interested, of course....



    Thats me falling over with shock/excitement... if you could make either one or both of those things happen it would make me (and many others im guessing) very very happy.



    A question for Frits (and Mr Jan Thiel is he's listening...) Can you give any updates on the ICRT?... is it still going ahead and are there any tips you can share on who might participate and what sort of engines we might see? I love the philosophy behind the series... free and open without restrictions... just what two strokes need to dominate again

    ***EDIT... i just found this link http://continentalchampionshipracetech.weebly.com Should have searched harder first, sorry... still interested to hear anything you might wish to add...

  2. #5552
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    20th July 2010 - 07:56
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    Quote Originally Posted by Frits Overmars View Post
    [/SIZE]Mental Trousers and yours truly just managed to work out a way to upload big files. Momentarily there is 37 MB of Aprilia information hovering in the cloud, waiting to be downloaded. Once you unzip it, it's over 70 MB.... And we could do the same with those other brands I just mentioned. Only if you are interested, of course....
    Interested?
    Frits your generosity is overwhelming.

  3. #5553
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    20th January 2010 - 14:41
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    Quote Originally Posted by F5 Dave View Post
    To put that in perspective you had just posted a picture of a pasty Asian guy with a monster mullet sitting on a scooter or something . So that was you!
    Nah sorry, Husaberg would never be seen dead or alive on a scooter.
    but it does concern me that your tastes run to pasty Asian dudes with large er.. mullets on scooters Bull-wee Wei Ciwus I guess?

    Add some old Derbi stuff later.

    Cheers to to Frits and Mental trousers?
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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

  4. #5554
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    I'm making lampshades out of these old things is anybody intersted in one?
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  5. #5555
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    The RSA was not the first behind-the-cylinder disc valve engine that honour might go to the CZ factory circa 1982
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  6. #5556
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    Quote Originally Posted by pete 2 View Post
    Sorry guys a bit off topic,but this thread has some very knowageable people, could i just ask what they think about this?
    at the entrance to the transfers the rsa aprilla has very wide dividers between each one while most tuners would narrow these down, i wonder what people like frits think about this or does it not matter.
    great thread by the way
    Not meaning to pick on you pete but anyone who does knife edges isn't a tuner, the above and the old chesnut of the 'ported and polished' are 2 of the big no no's. The first as Frits explained as well as port velocity is sub sonic, no propellor engined aircraft have sharp leading edges on wings. Besides 'knife edging' that Aprilia cylinder just cost you 3000Euro
    With port texture/finish the best analogy I ever heard was imagine 2 sheets of glass on top of each other, if you tried to move them around dry it would be quite difficult, but if you were to add a medium between the sheets of glass which would make the glass easier to move ? What medium would make it easier to move the glass? Oil or beach sand? The oil would make it more slippery (but viscous friction to over come) but a sprinkling of sand would allow the sheets of glass to 'roll' on each other

  7. #5557
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    Quote Originally Posted by 2T Institute View Post
    The RSA was not the first behind-the-cylinder disc valve engine that honour might go to the CZ factory circa 1982
    One should always be careful with such statements. I'm not claiming the MZ125 below was the first engine with such a disc, but it's at least 25 years older than the CZ.
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  8. #5558
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    Quote Originally Posted by 2T Institute View Post
    I'm making lampshades out of these old things is anybody intersted in one?
    Heck, I'll take one if you're giving them away... Need a new lamp shade...

    Seriously, looks like an RSA sand mould, or maybe a 3d printed model... Care to elaborate? It'd be very interesting to see the ducts in their true physical size.. Looking at cad models and sketches is one thing but seeing the real size would give a whole new understanding.

  9. #5559
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    Quote Originally Posted by Frits Overmars View Post
    One should always be careful with such statements. I'm not claiming the MZ125 below was the first engine with such a disc, but it's at least 25 years older than the CZ.

    I knew that I just wanted to see what else was in those Famous Frits Files

  10. #5560
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    20th January 2010 - 14:41
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    Derbi Stuff.
    The first paragraph is what drew me to the piovaticci

    Maybe Jan Could complete the yarn about the engine and how it came into being?

    I really like the Layout of the Narrow angle 125 V twin shame about the air cooling and it wasn't developed further.

    As per normal Kiwibiker. The attachment carefully loaded in sequence are in appearing in Random order pg1,6,2,3,4,5.

    Ps My take on the earliest rear facing carburetor rotary valve 2 stroke would be the Scott in 1912....


    Alfred Scotts engines were so good the authorities decided to handicap the 2 stroke by giving them a capacity multiplication of 1.32X

    How times have changed

    150cc 4 strokes vs 113cc liquid cooled 2 strokes seems about right to me
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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

  11. #5561
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    More old stuff this is one of my favourite race bikes so simple, so cheap, shame it was a couple of years to late. Without a better gearbox and Disk valve.

    Greeves Silverstone

    Note the effects of the inlet tract length and the pre Teflon crank seals
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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

  12. #5562
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    Quote Originally Posted by 2T Institute View Post
    I knew that I just wanted to see what else was in those Famous Frits Files
    Yeah, right..... How about something to really wet your appetite: a works Honda with a rear disc .
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  13. #5563
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    [QUOTE=husaberg;1130207683]More old stuff this is one of my favourite race bikes so simple, so cheap, shame it was a couple of years to late. Without a better gearbox and Disk valve.

    Greeves Silverstone

    In the period they were a real POS....biggest problem was the OE pistons - heavy/thick and very seize prone.
    Ask Mike Sinclair...I came round at Wigram to see him on one side of the track and the Greeves the other - and he crossed the track on a broken ankle because the thing was screaming it's ring out with a stuck throttle - when stripped it showed the partial seizure which had tossed him off but it had kept running on it's side....go figure.

  14. #5564
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    That rsa cylinder sandcore looks interesting, do you guys have photos of the coreboxes used for casting 2t cylinder?

    I have been dreaming of casting a 2t cylinder someday...

  15. #5565
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    Quote Originally Posted by gamma500 View Post
    That rsa cylinder sandcore looks interesting, do you guys have photos of the coreboxes used for casting 2t cylinder? I have been dreaming of casting a 2t cylinder someday...
    The cores for the exhaust and transfer ducts are not the most difficult parts; it is the cooling waterjacket core that really complicates things when you are planning to cast your own cylinders. In my Aprilia-papers there are CT-scans of the ducts and the cooling void, available as soon as mental trousers has worked out a way to make those data accessible.

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