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Thread: ESE's works engine tuner

  1. #35626
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    4th September 2017 - 10:39
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    Daelim besbi 2008
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    Quote Originally Posted by TZ350 View Post
    .
    The Fuel Injected Langen achieving Euro 5 certification is brilliant.



    Towards the end of the dyno runs you can hear it hitting a rev limiter.

    With only one injector my guess is that its limited to about 11,500 max rpm. Not because the injector is to small but rather an injector big enough for high RPM is to big at Low RPM for clean throttle response.

    Attachment 349281
    This is not "Direct Injection", direct injection is injecting directly into the cylinder after the exhaust port has closed. And the limited time available for injection in direct injection engines is what limits their performance.

    At some point on the engine load curve the reed block injector must be on for nearly the full 360 deg of crank rotation. And at other points the injector will be on for a significant amount of time to achieve a homogeneous air/fuel mixture in the crankcase that is ready to be drawn up the transfers.

    The air/fuel mixture in the crankcase does not go directly to the cylinder but rather has to wait its turn. On each cycle the air/fuel mixture in the transfer ducts is sufficient to replenish the cylinder and the air/fuel mixture in the crankcase merely replenishes the transfer ducts ready for the next cycle. So the Langen crankcase with its reed injection has to have a proper air/fuel mixture throughout the crankcase. "B" port injection is not limited in this way.

    It is interesting that they can achieve Euro 5 with the Langen by directly injecting into the crankcase because it is hard to see how that is much different to the way a carb feeds the crankcase. I would think that both would have air/fuel mixture short circuiting out the exhaust and to some extent back out the inlet.

    There must be more to this story, I would love to know what it is.

    You know that's not stratified scavenging like TPI is and that it's hardly better than a carburetor.
    The Euro5 not includes minority group bikes (langen only 100 units) (trial offroad ones too)
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #35627
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    18th April 2017 - 23:08
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    what are the requirements for euro 5?

    https://m.youtube.com/watch?v=RwB5_lL8wyU
    No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

  3. #35628
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    30th April 2011 - 04:57
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    bsa. honda. aprilia
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    langen

    is it me or did it sound a bit boggy when he blips the throttle..?

  4. #35629
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    4th September 2017 - 10:39
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    Quote Originally Posted by Muhr View Post
    what are the requirements for euro 5?

    https://m.youtube.com/watch?v=RwB5_lL8wyU
    https://eur-lex.europa.eu/eli/reg/2019/129/oj?locale=en

  5. #35630
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    18th April 2017 - 23:08
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    https://publications.jrc.ec.europa.e...%20%282%29.pdf

    Euro 5 emissions limits (petrol) CO: 1.00g/km HC: 0.10g/km NOx: 0.06g/km PM: 0.005g/km
    No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

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