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Thread: ESE's works engine tuner

  1. #34981
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    2nd March 2013 - 15:04
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    Quote Originally Posted by edgefinder View Post
    Here's a good place to monitor weather where you'll be racing
    https://airdensityonline.com/tracks/
    Thanks, that's useful for the big tracks, but only includes one kart track.
    In any case, the air density varies all the time, so using an average value would be less useful.

  2. #34982
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    8th February 2007 - 20:42
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    Ive been to every kart track in the country and the only one that has any issues getting current cell phone based weather data from a nearby airport is Rotorua.
    Only due to being in the middle of nowhere .
    But even there its possible to travel not far to get a signal.
    The same app works in Vegas , Lonato or Te Puke.
    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.

  3. #34983
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    18th April 2017 - 23:08
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    Quote Originally Posted by philou View Post
    Yes you understood me.

    For the gears, the language barrier will make this impossible

    I invite you to try the "filengrenne" software which I think will give you a little answer for gears.

    https://moodle.insa-rouen.fr/course/view.php?id=700
    Looks really interesting! Have only seen a few videos with very limited understanding of French, but will try the program as soon as I get to a windows computer.
    looks like it has a cam module?
    No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

  4. #34984
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    6th February 2012 - 08:54
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    The software manages all common involute gears types of metric module and diametral pitch toothing.
    They manage gears interference, teeth creeping,...

    It's free. Only the post-processor and gcode function to codrive the cnc machines can be purchased

    The export in CAD software is ok and free.

    Warning to the units metric and impérials set between in the software

  5. #34985
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    4th December 2011 - 22:52
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    Gasdynamics - Issue 2

    Please let me know if you disagree, want something explained better etc.

    Click image for larger version. 

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  6. #34986
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    Neels, is that correct or is the bulk temp lower because of the short circuting?

    The effect on the pipe, other than the pulse shape change by the contact discontinuity, is that
    on the older engine the pipe bulk temperature is higher than on a modern engine and the
    result is a longer tuned length for the same rpm value

  7. #34987
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    20th April 2011 - 08:45
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    Quote Originally Posted by Vannik View Post
    Gasdynamics - Issue 2. Please let me know if you disagree, want something explained better etc.
    Once again great reading Neels. To come across something described so clearly and understandably is a rarity. It reminds me of professor Alfred Jante's treatises that I cherish .

  8. #34988
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    3rd August 2012 - 02:39
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    I like only the last line Frits and Neels

    . This promotes mixing of the gas and it smears the contact discontinuity. So if your
    pipe relies on the primary or secondary contact discontinuity, having a bend in the header will
    influence the way the pipe works. This is why some pipes are sensitive to curvature and others
    not.

  9. #34989
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    20th June 2020 - 07:10
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    Neels, I just want to add to the praise. To elegantly answer that many gray areas in my, and many others thoughts takes a great deal of skill. The FOS pipes I showed a few days ago that worked very well were originally built for, and tested on a vintage machine with the same “port map” on paper as the more modern machine that they did very well on. They did absolutely nothing for the vintage shaft duct, blowdown deficient engine. I somewhat expected that result from bits I have picked up on to do with diffuser design, but this really helped. Thank you very much.

  10. #34990
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    4th December 2011 - 22:52
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    Quote Originally Posted by 41juergen View Post
    Neels, is that correct or is the bulk temp lower because of the short circuiting?

    The effect on the pipe, other than the pulse shape change by the contact discontinuity, is that
    on the older engine the pipe bulk temperature is higher than on a modern engine and the
    result is a longer tuned length for the same rpm value
    Yes, the short circuiting is less than the residual fresh charge in a modern engine, plus a modern engine has a cooled exhaust port duct.

    The aim on a modern engine is to plug back into the cylinder only the coldest and purest part of the fresh charge in the exhaust port duct. That way we can prevent detonation and gain power.

  11. #34991
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    20th June 2020 - 07:10
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    L-ring gobbledegook

    Shown is a sketch of something that I have been wondering about. The numbers are fabricated, more so the idea that is of question. A 1mm oversize piston and cylinder coupled with the engines factory 1mm smaller cylinder head, whilst using a L-ring piston. The squish gap is large at 1.6mm, just an everyday rider engine on pump gas. Being that it is an L-ring, is it still necessary to cut the head to the proper bore size, or would it be more logical to leave the smaller head diameter because the ring is a few degrees lower than the edge of the piston? I understand the nooks and crannies are of concern, but what is worse? You either end up with corners, or a larger gap between the ring and the “new” cut head. If I smash solder with the smaller diameter head it measures 1.6mm inside the squish band area and 2mm above the ring. If I were to cut the heads, there would be an even larger gap above the ring.

    1mm larger diameter is .5mm per side. ( obviously but worth noting )
    Apologies for the likely sideways photo.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  12. #34992
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    Having alot of mixture trapped at the bore edge is asking for deto as there is no cool surface close by , plus that volume burns way too late in the combustion cycle to help push the piston down effectively.
    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.

  13. #34993
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    Quote Originally Posted by philou View Post
    The software manages all common involute gears types of metric module and diametral pitch toothing.
    They manage gears interference, teeth creeping,...

    It's free. Only the post-processor and gcode function to codrive the cnc machines can be purchased

    The export in CAD software is ok and free.

    Warning to the units metric and impérials set between in the software
    I took the easy way this time but a super usable program that I will benefit from many times!
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    No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

  14. #34994
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    Muhr, setting the correct clearance on a set of such gears is a nightmare. You should definitely google Cylkro Kronenräder. It offers a much better solution. If I had encountered it earlier, I would undoubtedly have recommended it for the Aprilia RSA.
    Click image for larger version. 

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  15. #34995
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    6th February 2012 - 08:54
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    The engineers blue marking is very good for locating the surfaces of the gear teeth and adjust the correct clearance

    Old school style

    Click image for larger version. 

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