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Thread: the clean two-stroke thread

  1. #376
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    24th February 2013 - 08:12
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    Quote Originally Posted by Flettner View Post
    gearbox is in and bottom crankshaft.


    Looks good

  2. #377
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    4th September 2017 - 10:39
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    The decade of the 90 is the one that more patents have been found for 2S, most are from Stihl and Bosch, so there are also many others dedicated to stratified scavenging
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  3. #378
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    22nd November 2013 - 16:32
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    Quote Originally Posted by ceci View Post
    The decade of the 90 is the one that more patents have been found for 2S, most are from Stihl and Bosch, so there are also many others dedicated to stratified scavenging
    What a pisser, the dirty bastards...……as always, some old mate somewhere has done it before...just to add insult to injury, I have been using a Walbro carby on my test rig… Wonder if they actually had engine running? Good on them though for thinking about clean 2 strokes.
    Oh well, will keep trying, have had some interruptions of late. Have to get some more valves wire cut before my mate finishes work at the end of November,

    Click image for larger version. 

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    Attached Thumbnails Attached Thumbnails Walbro head induction US4995349.pdf  
    "Success is the ability to go from one failure to another with no loss of enthusiasm.”

  4. #379
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    22nd November 2013 - 16:32
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    Happy reading if this pdf works..

    Click image for larger version. 

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    "Success is the ability to go from one failure to another with no loss of enthusiasm.”

  5. #380
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    10th February 2005 - 20:25
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    Quote Originally Posted by ken seeber View Post
    What a pisser, the dirty bastards...…… Good on them though for thinking about clean 2 strokes.
    Oh well, will keep trying,
    Click image for larger version. 

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    Ken,
    That's the way. don't let the bastards wear you down! - see it all through + a bit more!
    Strokers Galore!

  6. #381
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    22nd November 2013 - 16:32
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    They reckon that this made a difference, looks like some proprietary system, maybe something that TZee was playing with. Constant sped and load, so no transient complications.

    https://www.youtube.com/watch?v=0Ynl...ature=emb_logo
    "Success is the ability to go from one failure to another with no loss of enthusiasm.”

  7. #382
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    12th March 2010 - 16:56
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    looks like a shit little motor but I guess you cant argue with their record.

  8. #383
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    28th August 2015 - 00:01
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    Careful, that's one of the motors we race. Of course ours are water cooled with a tuned pipe and port mods. They're good for around 7 hp at 16,000 rpm. That one is probably lucky to have 4 1/2 hp. I wonder whether its fuel consumption per hp is better. Of course I wouldn't bet on one of our race engines lasting 10 hours at full throttle.

    Lohring Miller

  9. #384
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    12th March 2010 - 16:56
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    Yes 10 hours is a lot under full load.
    Perhaps they need an OP engine.

  10. #385
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    28th August 2015 - 00:01
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    Absolutely

    Lohring Miller

  11. #386
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    4th September 2017 - 10:39
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    Curiosities of life ADOLF SCHNUERLE in 1932 changed the cross scavenging, abandoned the stratified uniflow scavenging 1928.
    The current trends are to abandon scavenging SCHNUERLE and return to uniflow scavenging

    https://worldwide.espacenet.com/pate...pn%3DDE463019C

    https://worldwide.espacenet.com/pate...pn%3DCH172816A

  12. #387
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    Since its invention by Sir Dugald Clerk the two stroke engine (scavenging uniflow) brought the short circuit and the loss of hydrocarbons through the exhaust.
    With the invention of patent DE463019C these defects in this type of two stroke engine design were solved.
    With the invention crankcase as a charging pump by Joseph Day, the two stroke engine is simplified to the detriment of clean advances
    And that detriment of the clean two stroke engine increases as new inventions appear which are developed only to obtain more HP
    The opposed-piston is one more of the inventions that the only thing that has been sought is to obtain more HP without taking into consideration the clean two stroke engine (DKW / Kurt Kuhnke KS-1, 1951 Vespa opposed-piston 2-stroke.)
    When recent CFD simulations show that the opposed-piston could perform stratified scavenging and advance the clean two stroke engine
    there will one day be a clean two stroke engine or we are only interested in making it the most powerful

  13. #388
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    4th September 2017 - 10:39
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    convoluted two stroke engine Opposed piston

    https://worldwide.espacenet.com/pate...%3DDE2850041A1
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  14. #389
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    12th March 2010 - 16:56
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    Quote Originally Posted by ceci View Post
    convoluted two stroke engine Opposed piston

    https://worldwide.espacenet.com/pate...%3DDE2850041A1
    Strikingly similar.
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  15. #390
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    1st May 2016 - 13:54
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    Quote Originally Posted by Flettner View Post
    Strikingly similar.
    I can see the title of the the Text Book!

    Advanced 2 Stroke Engine Design - The Theory and The Practice. (with colour plates)

    Keep up the great work Neil!!

    Cheers, Daryl.

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