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Thread: ESE's works engine tuner

  1. #33541
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    10th February 2005 - 20:25
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    FW190,
    Didn't even know that Rotax had a turbo (you're talking snowmobile engines?) - if so, I haven't studied them as yet - but will have a look soon no doubt! - why the hell would you need an expansion chamber AND a turbo?

    Flettner,
    Yes I reckon! - but the exhaust would still need to close a little earlier (preferably as the fresh charge just gets to it) either by asymmetric port timing or a shutoff valve of some sort! ( a rotating sleeve? ) - just a suggestion inspired by a hunch based on a dream I had a while ago
    Freedom of speech is important - but
    P.C. has destroyed our right to speak the truth.

  2. #33542
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    4th December 2011 - 22:52
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    Quote Originally Posted by WilDun View Post
    - why the hell would you need an expansion chamber AND a turbo?
    The best way to look at a turbo is to consider it a device that increases atmospheric pressure. Then all the requirements at 1 atmosphere are still there at higher atmospheres.

    It stays a 2T so you still need blowdown, and a plugging pulse. Because of the extra power you can go for a milder tune if power spread is required but the snowmobile drag sleds use very high levels of tune.

    If you do not want to use a tuned pipe you have to go for a Uniflow engine.

  3. #33543
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    24th January 2014 - 08:12
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    Quote Originally Posted by Vannik View Post
    The best way to look at a turbo is to consider it a device that increases atmospheric pressure. Then all the requirements at 1 atmosphere are still there at higher atmospheres.
    Thank you Neels :-)

    A question I always had: Will supercharging a rotary inlet 2 stroke work? I was always sceptical in terms of rotary valve wear.
    But since the turbocharger is shifting the median pressure everywhere inside the engine, the pressure difference crankhouse to intake manifold might remain the same?!
    A friend tried it with a VW smoke pump roots on a 100cc kart engine - that did not work with a short manifold due the pulsation of the roots compressor. Has anyone tried this with a decent volume between supercharging device and rotary plate? Flettner by chance?

  4. #33544
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    18th May 2007 - 20:23
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    .

    Here you go. Original 26hp Sporty 125cc two stroke turbocharged complete with expansion chamber.

    Basically they just doubled the hp by adding a Turbo. They got 53hp at 11,000 rpm with 1 bar boost.



    Guess who at Team ESE wants to turbo his 2T ...... ... me me me.

  5. #33545
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    This is a good look at their 50cc version.

    19.6 hp at 11,931 rpm, low boost. As 15,000 rpm is easily possible and higher boost there looks to be plenty of potential.



    The particular racing class that Team ESE are involved in allows for turbocharged 70cc water cooled two strokes.

  6. #33546
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    And then there's a really serious turbo engine with maybe 800 hp on nitrous:

    Lohring Miller

    Click image for larger version. 

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  7. #33547
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    Quote Originally Posted by lohring View Post
    And then there's a really serious turbo engine with maybe 800 hp on nitrous:

    Lohring Miller

    Click image for larger version. 

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    Lohring, I have a number of photos of that sled but no info on it running. Do you know more?

    Neels

  8. #33548
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    12th March 2010 - 16:56
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    Quote Originally Posted by lohring View Post
    And then there's a really serious turbo engine with maybe 800 hp on nitrous:

    Lohring Miller

    Click image for larger version. 

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    How do they not melt the pistons?

  9. #33549
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    25th August 2010 - 04:40
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  10. #33550
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  11. #33551
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    12th March 2010 - 16:56
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    How do they side step physics, all that extra thermal load. Aluminium pistons would surely have long vaporized within seconds.

  12. #33552
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    21st June 2012 - 14:20
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    Perhaps lots of extra fuel and water injection like the Reno Air Racers have used forever?

  13. #33553
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    12th March 2010 - 16:56
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    Methanol I guess and as you say lots of it. Hardly practical for an off road enduro bike. Or does this mean we need to use really small engines.
    Never the less, impressive performance, I'd like that next time I come up a 450 in a drag race out of a corner. 😆

  14. #33554
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    now just to join the drive shaft.
    Drive shaft sized to handle turbo charged twostrokes in the future.😆

  15. #33555
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    12th March 2010 - 16:56
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    And not to forget the picture.
    Looks like I might have to raid the backup scrap heap.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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