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Thread: ESE's works engine tuner

  1. #39421
    Join Date
    21st March 2014 - 22:00
    Bike
    RZ350, TZR250 3XV, TZR250 3MA, TZR125
    Location
    Hanau, Germany
    Posts
    141

    3MA cylinders

    The 3MA10 cylinders from the MJ 1990 3MA3 also have low timings (192/126), but a wider C-port and a more rectangular A-port what makes it difficult to get the triangle shape of the aux export and so the required blowdown..

    Click image for larger version. 

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  2. #39422
    Join Date
    8th February 2007 - 20:42
    Bike
    TZ400
    Location
    tAURANGA
    Posts
    3,901
    A wider C port is not optimal ,and means the B rear wall cant be moved around as much.
    The big issue though is the dumb rectangular Aux port - even looks like the useless 4DP.
    You would have to weld up 1/2 that port to get the triangular shape needed to prevent vertical short circuiting , and reduce the effect of port linking
    to the A via the small end hole.
    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. #39423
    Join Date
    18th March 2004 - 17:38
    Bike
    1971 suzuki T350R,1980 suzuki GSX1100
    Location
    the best island
    Posts
    489
    The 3MA cylinder I have looks like just like the one 41juergen posted. I think you have helped make up my mind, The 3XV seems to be the one to use.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

  4. #39424
    Join Date
    28th August 2015 - 00:01
    Bike
    1975 Hodaka Wombat
    Location
    Eugene, Oregon, USA
    Posts
    303
    Re spark plug projection: Removing the plug washer is a trick used in karting to get the spark closer to the center of the combustion chamber. I have no data on how much if any this helps.

    Lohring Miller

  5. #39425
    Join Date
    8th February 2007 - 20:42
    Bike
    TZ400
    Location
    tAURANGA
    Posts
    3,901
    Plug projection - yes and no. I spent hours setting up the long version R7282A -105 used in Honda's with under plug deto sensor to remove the extra 3mm of thread
    to have the electrodes well into the combustion chamber middle. Made no difference at all in a KZ.
    But Frits has done a similar thing by removing the bare unthreaded end of a conventional plug , and reports that its as good as the all conquering R7376 for way less dollars.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    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.

  6. #39426
    Join Date
    18th November 2020 - 03:49
    Bike
    1975 Bultaco Pursang 250
    Location
    Barcelona
    Posts
    9
    Quote Originally Posted by Frits Overmars View Post
    A Bultaco head, isn't it? All Bultacos I've worked on had long reach spark plugs so I wonder what type yours is.
    Anyway, never fit a short reach plug in a long reach head or vice versa. And if your head was modified from a short to a long reach plug, chances are that it was not the only modification, so you may forget about the manual in this respect.
    Hi Frits!

    Thanks for the reply. Yes, It's an early Bultaco head yes! It has that typical "trench" combustion chamber.

    You're right, all Bultacos have long reach Spark plug, except the 100cc and 74cc models.
    The bike I'm rebuilding is a Lobito AK 100, a factory racer based on the Lobito trail bike, to compete against Hodakas in the 100cc class in the US.
    It seems to be stock, I can't see any modification to it. I've asked a friend that has the same model and he sent a picture, and the same happens:

    Click image for larger version. 

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    So it must be this way from the factory, but I don't know why. I've tried using a long reach spark plug and protrudes around 1mm:

    Click image for larger version. 

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    What would you do? With this being a 100cc engine with a 14:1 head, using one plug or the other is going to affect the compression ratio considerably also.

    Thanks in advance!

    Quote Originally Posted by lohring View Post
    Re spark plug projection: Removing the plug washer is a trick used in karting to get the spark closer to the center of the combustion chamber. I have no data on how much if any this helps.

    Lohring Miller
    Hi Lohring!

    Thanks for your comment. Funny considering this cylinder and head where designed initially for the 100cc direct drive kart class.
    The picture above is using the plug washer and a long reach plug. It protrudes about a mm.

  7. #39427
    Join Date
    8th February 2007 - 20:42
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    TZ400
    Location
    tAURANGA
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    3,901
    I have searched again many times , but cant find the original NGK technical bulletin that said the new range of plugs with the end threads removed , were actually intended to protrude exactly that 1mm.
    Any body protrusion into the chamber is specifically banned in many kart classes , but the electrodes are not " the body " , just a piss off it didnt work in the KZ.
    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.

  8. #39428
    Join Date
    12th March 2010 - 16:56
    Bike
    TT500 F9 Kawasaki EFI
    Location
    Hamilton New Zealand
    Posts
    2,772
    The water cooled, twin exhaust port, twin blade powervalve cylinder slowly happening. A first I believe?
    I might retain the cylinder from underneath so as to get more exhaust port wall access to water cooling.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #39429
    Join Date
    22nd November 2013 - 16:32
    Bike
    STRIKE trike & KTM300 EXC TPI
    Location
    Perth, Western Australia
    Posts
    880
    Anyone rolling exhaust cones?

    You need one of these:

    https://www.facebook.com/share/r/trQ...ibextid=oFDknk
    "Success is the ability to go from one failure to another with no loss of enthusiasm.

  10. #39430
    Join Date
    18th March 2004 - 17:38
    Bike
    1971 suzuki T350R,1980 suzuki GSX1100
    Location
    the best island
    Posts
    489

    Ugh!

    Quote Originally Posted by ken seeber View Post
    Anyone rolling exhaust cones?

    You need one of these:

    https://www.facebook.com/share/r/trQ...ibextid=oFDknk
    I must spent two minutes watching that( the video is only 5 seconds long)

    considering how long I have spend fighting manual rollers I am green with envy.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

  11. #39431
    Join Date
    10th April 2013 - 09:59
    Bike
    Honda NSR 50
    Location
    Netherlands
    Posts
    12
    https://youtu.be/KX6FnYgXdHM?feature=shared

    Just because it can be done

    Im stunned that this even runs, especially when using such rudimentary tools.


    Verzonden vanaf mijn iPhone met Tapatalk

  12. #39432
    Join Date
    25th October 2022 - 04:48
    Bike
    1974 yz 125
    Location
    Minnesota (United States)
    Posts
    6
    This guy must have watched an Allen Millyard video then turned to his buddy and said "hold my beer"






    Quote Originally Posted by JdG View Post
    https://youtu.be/KX6FnYgXdHM?feature=shared

    Just because it can be done

    Im stunned that this even runs, especially when using such rudimentary tools.


    Verzonden vanaf mijn iPhone met Tapatalk

  13. #39433
    Join Date
    12th March 2011 - 02:31
    Bike
    r6ypvs hybrid
    Location
    usa
    Posts
    60
    BRC making progress on it's 600 twin. Posted an update and pix on Facecrack. He was clear that Frits, Jan and Wob were a lot of inspiration and it shows in transfers, exhaust and cooling regimes. If only there were more 100, 125 and 175 cc "street" cylinders similar.

    https://www.facebook.com/brcracingca...eric&ref=notif

  14. #39434
    Join Date
    26th April 2013 - 21:55
    Bike
    BMW R1200R 2009
    Location
    Belgium
    Posts
    132
    Quote Originally Posted by 136kg136ps View Post
    BRC making progress on it's 600 twin. Posted an update and pix on Facecrack. He was clear that Frits, Jan and Wob were a lot of inspiration and it shows in transfers, exhaust and cooling regimes. If only there were more 100, 125 and 175 cc "street" cylinders similar.

    https://www.facebook.com/brcracingca...eric&ref=notif
    Cooperation between some of the best technicians, and the most knowledgeable two stroke geniusses from canada, the netherlands, and new-zealand.

    I hope this cylinder can be bolted on the KTM 300SX cases.

  15. #39435
    Join Date
    3rd May 2017 - 04:03
    Bike
    1997 Yamaha rd 350
    Location
    Russia
    Posts
    172

    Electronic unit for starter generator

    My tear create Electronic unit for starter generator.
    It is possible use offshelf brushless motor to start engine.

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