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Thread: ESE's works engine tuner

  1. #37021
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    13th June 2010 - 17:47
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    Many years back, a local sidecar crew looking for the last bit of HP from their 600 Honda - it was already on large % of nitro - tried ram air.
    They did it right with a duct from the high pressure area low in front of the fairing, up and over into the airbox.
    After much testing, they were prepared to say that it gave roughly 200 more RPM at the end of the longest local straights. On a good day.

    It was left on the bike as much to baffle other competitors as anything else.

  2. #37022
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    12th March 2010 - 16:56
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    TZ, you need this, throw that shit carburetor away.
    https://youtube.com/shorts/rxc1OFcQgPM?feature=share

  3. #37023
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    21st August 2014 - 13:28
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    almost wouldn't need an inlet valve with that set up

  4. #37024
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    4th September 2017 - 10:39
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    Daelim besbi 2008
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    España
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    This is the last time I suggest it, I will not talk about this again, nor will I bother you with this issue.
    I will never develop it, because I do not have the means to do so, the most is what I have done "CAD 3D"

    Quote Originally Posted by wobbly View Post
    And adding to the effect of having very high exhaust duration you can cut the skirts short such that the port is open a few mm when the piston is at TDC.
    Wreaks havoc with the jetting , but in the project i tried that we were using big pumper carbs.
    Very easy to adjust the fuel curve as was needed - but I doubt a normal carb could be made to work.
    This setup on a " stock " 950 SeaDoo .


    Quote Originally Posted by andreas View Post
    And also as I said, I think it had a shared pipe with a y- section to the cylinders, so there is no need to have ducts from one cylinder to the other. If your idea works with separate pipes, I don't know.


    Quote Originally Posted by wobbly View Post
    This setup on a " stock " 950 SeaDoo gave an added 8 Hp in about 80 , so 10% - enough for the title at Havasu.
    On a 1180 twin race motor the bump was 15 Hp in 120 so a little less.
    The 10% increase in power is clearly insufficient to "motivate, encourage" to use this system and try to improve it.

  5. #37025
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    18th April 2017 - 23:08
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    Quote Originally Posted by TZ350 View Post
    Attachment 351160

    Tupper Ware lunch box. All in one, carb cover and catch tank.

    Second try at protecting the carb from wind blowing across the bell mouth and upsetting the mixture.
    Nice�� A little dragy but what does it matter.
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    No amount of experimentation can ever prove me right; a single experiment can prove me wrong.

  6. #37026
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    8th February 2007 - 20:42
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    Ceci , the problem you are up against is that 180* firing parallel twins with a single pipe are a weird anomaly used in restricted classes of Jetskis and Snowmobiles for packaging/ space/cost reasons only.
    Nothing to do with efficiency or power.
    The bottom line is that twin pipes make way, way more power and do that with alot less Exhaust port timing needed for the Y and single pipe setup.
    They also allow a parallel twin to be run in the " big bang " 90* firing configuration , albeit then needing a balance shaft.

    The cut piston skirt idea I developed just as a cheat of the rules to win a world title , it worked , but I can see no other reason to be looking into it as an on going project with some worthwhile end goal.
    Those cut pistons also had a ceramic coating ( illegal as well ) equal to 50% of the inner dome area , and once they had been run hard , they colored up in the middle thus camouflaging the coatings existence.
    That idea of ceramic coating just the pistons combustion chamber area ( and the chamber itself ) , but not the squishband , does have an application in any 2T race engine , as it reduces the thermal load on the piston - and
    the heat rejected into the water cooling system.

    Take that idea and you can use it anywhere , as its a guaranteed way of being able to run leaner and make more power.
    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.

  7. #37027
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    18th May 2007 - 20:23
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    Quote Originally Posted by Flettner View Post
    TZ, you need this, throw that shit carburetor away.
    https://youtube.com/shorts/rxc1OFcQgPM?feature=share
    Yes, I love what you have done with the rotary valve sliding gibs for throttle control.

    Maybe when I build the next engine. A 69cc turbocharged rotary valve setup. I could copy your sliding gib idea and fuel inject it through the turbo intake.

  8. #37028
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    12th March 2010 - 16:56
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    Ok, finaly RSW cylinders. You will need to contact Glenn if you are interested.
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  9. #37029
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    8th February 2007 - 20:42
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    Sadly Neil , I cant believe someone got you to copy the oldest and least powerful Aprilia cylinder ever made - before Jan made it work properly.
    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.

  10. #37030
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    12th March 2010 - 16:56
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    Quote Originally Posted by wobbly View Post
    Sadly Neil , I cant believe someone got you to copy the oldest and least powerful Aprilia cylinder ever made - before Jan made it work properly.
    Sooo... I guess thats a no then

  11. #37031
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    20th January 2010 - 14:41
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    Quote Originally Posted by wobbly View Post
    Sadly Neil , I cant believe someone got you to copy the oldest and least powerful Aprilia cylinder ever made - before Jan made it work properly.
    The patterns for anything later were not available for those Wob (at a price i could afford anyway.)
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  12. #37032
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    12th March 2010 - 16:56
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    Quote Originally Posted by wobbly View Post
    Sadly Neil , I cant believe someone got you to copy the oldest and least powerful Aprilia cylinder ever made - before Jan made it work properly.
    I didnt make these patterns, they have been made by a professional, proper. Above my pay rate.

  13. #37033
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    20th January 2010 - 14:41
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    Quote Originally Posted by Flettner View Post
    I didnt make these patterns, they have been made by a professional, proper. Above my pay rate.
    At about 200 hours at my hourly pay rate.....

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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

  14. #37034
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    18th March 2013 - 04:44
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    Wobbly could port them before plating? They are from before 1994? https://twitter.com/NeilHodgson100/s...23207133102081 Today from Mugello. Sadly he only made one lap.

  15. #37035
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    20th April 2011 - 08:45
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    Quote Originally Posted by husaberg View Post
    The patterns for anything later were not available for those Wob (at a price i could afford anyway.)
    I don't want to be judgmental about how deep your pockets are Husa, but casting cylinders using those ancient RSW patterns makes me think of taking up smoking because you found a pack of cigarettes.

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