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Thread: ESE's works engine tuner

  1. #31006
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    7th October 2015 - 07:49
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    honda ns 400
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    Lithuania
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    179
    Some interesting graph about mix burning speed. This is general information, but maybe can help.

    1. Percentages - residual EX gas in fresh mix
    2. Lambda from 0.6 to 1.2

    With 43 % residual Ex only at 0.8 burning speed still usable.
    Maybe this can explain why sometimes is very difficult adjust carburation at some rpm.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #31007
    Join Date
    3rd May 2017 - 04:03
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    1997 Yamaha rd 350
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    Russia
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    73

    Oversize 2-stoke cylinders

    Want to be adviced:
    Where to get cheap lightweight aircooled cylinder kits (nikasil or very thin liners) 70, 85, 110, 125 and 172cc.

    They should be
    - available in different countries and fitted to widelly spread moto and scooters
    - small and lightweight
    - dont want reed valve on cylinders
    - be symmetrical shaped
    - work nicelly at 8500...11500 rpm
    - be nicelly ported and powerfull for its sizes
    - not have too thin piston finger

    Pro and contra
    Honda (oversize Dio 50 and Lead 100) ???
    Yamaha (oversize Jog 50, Jog 90, address 100 and 110)???
    Suzuki (address 50, address 100, LT 80)???

    Want to try on my 2-cylinder engines instead of chainsaw cylinders. May be I am wrong and chainsaw cylinders are light and powerfull enough or can be easily ported and give good power with correct resonator??? Says 120cc Husqvarna 3120XP have 8.5hp and with tuned pipe have 14hp. Cylinder weight just 1kg.

  3. #31008
    Join Date
    23rd March 2015 - 21:24
    Bike
    Conti RX356 V3
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    Germany
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    36
    Airsal has a massive range of cylinders for all sorts of mopeds, scooters, bikes and so on...

  4. #31009
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    24th February 2009 - 05:24
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    honda cub90
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    Ireland
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    109
    piaggio hexagon/NRG 125/175cc?

  5. #31010
    Join Date
    3rd May 2017 - 04:03
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    1997 Yamaha rd 350
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    Russia
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    73
    Quote Originally Posted by koenich View Post
    Airsal has a massive range of cylinders for all sorts of mopeds, scooters, bikes and so on...
    Thanks, looking their site. We have Athena representative in country, but dont sell less than 3000 Euro per order.

    1. I can buy from Taiwan: PIAGGIO A/C Bige Bore:’50x39.2(77cc)

    With delivery each set will cost 91 USD
    Any idea what power possible get?

    2. Can get in China 47.6MM oversize Jog


    Is any of this variants good? What real power possible get?

    Quote Originally Posted by TerraRoot View Post
    piaggio hexagon/NRG 125/175cc?
    Seems it can be only liquid cooled?

  6. #31011
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    24th February 2009 - 05:24
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    honda cub90
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    Ireland
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    109
    there are aircooled versions, https://www.pmtuning.co.uk/malossi-a...0cc-air-cooled

    not certain of the models, maybe a skipper 125/150 is another

  7. #31012
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    3rd May 2017 - 04:03
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    1997 Yamaha rd 350
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    Russia
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    Quote Originally Posted by TerraRoot View Post
    there are aircooled versions, https://www.pmtuning.co.uk/malossi-a...0cc-air-cooled not certain of the models, maybe a skipper 125/150 is another
    Nice link. They provide estimated hp data https://www.pmtuning.co.uk/polini-ev...0cc-air-cooled

  8. #31013
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    15th May 2017 - 14:26
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    2002 Aprlia RS125
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    Brisbane
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    16
    Quote Originally Posted by wobbly View Post
    That then is the problem with the AM6.
    If you have holes in the skirt above the small end that connect the Aux and the A transfer,then it will run rich,and will not respond at all
    to jet changes.
    The seemingly rich mixture in the Exhaust is caused by the short circuiting, not by rich jetting, so you go leaner and nothing happens.

    A file I have of a fully tuned TZR50 that puts out 18Hp Crank at 13,000 with triple Exhaust ports and this has a spigot exit area equivalent to 22mm.
    This is 78% of the Exhaust effective area, and gives a Mach of 0.8 , absolutely fine.
    Going slightly bigger in displacement or making more power than this would put the exit velocity close to sonic, so yes this may well be an issue as well.

    The case com ratio is a very important element, guessing or not measuring it correctly isnt an option.
    PS - you have a worn out piston available, drill a hole in it.
    What did you use the TZR50 engine for?


    Sent from my iPhone using Tapatalk

  9. #31014
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    15th May 2017 - 14:26
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    2002 Aprlia RS125
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    Brisbane
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    Quote Originally Posted by wobbly View Post
    The 50cc pipe shown is an early version ( based on Aprilia style cones ) done for a customer that wanted peak power at only 13,000,and that translates to a tuned length
    in the 760 ballpark.
    Later more powerful versions of that pipe were even fatter,and had a single rear cone , but the length remained similar to suit the powerband requested.
    Hi Wobbly. What was the pipe designed for Road racing? MX?...


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  10. #31015
    Join Date
    8th February 2007 - 20:42
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    TZ400
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    tAURANGA
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    No idea what the customer wanted to do with the engine.
    I was told where to put the peak power , and of course argued till I was blue in the face that 13,000 was plain idiocy , in that it was capable of
    making way more power - over a wider bandwidth if it went to 18,000.
    But in the end I did the port and pipe sim as requested, took the money and shut the fuck up.
    Not something that came naturally I must say.
    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.

  11. #31016
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    15th May 2017 - 14:26
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    2002 Aprlia RS125
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    Brisbane
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    Quote Originally Posted by wobbly View Post
    No idea what the customer wanted to do with the engine.
    I was told where to put the peak power , and of course argued till I was blue in the face that 13,000 was plain idiocy , in that it was capable of
    making way more power - over a wider bandwidth if it went to 18,000.
    But in the end I did the port and pipe sim as requested, took the money and shut the fuck up.
    Not something that came naturally I must say.
    I know it's a big topic.

    Could you please explain the benefits of moving the power up the rev range? What sort of things do you need to take into account? I am sure you have to get everything working well together. The right clearances, correct squish, right size and port angles, right size carb, good crank balance ?


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  12. #31017
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    8th February 2007 - 20:42
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    TZ400
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    tAURANGA
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    Very basically Power =Torque X RPM.
    If you increase the rpm by 30% and hold up the torque , you get 30% more power.
    Added to this the intake and Ex tuning action can be alot stronger at the higher rpm level, but of course you must create a synergy between the port STA numbers
    and the tuned lengths of each system .
    For me the biggest area that can be addressed is because the pipe must by definition be alot shorter , the angles will naturally be steeper for the same belly diameter.
    There is a finite amount of energy in the Ex wave front travelling down the pipe elements and this is affected by the belly dia /pipe vol.
    To get the same reflection amplitude from a fat pipe needs steeper ( shorter ) rear cones , and there is a quickly reducing return on efficiency if the volume becomes too big as
    would be the case if you kept increasing diameter to obtain steeper diffuser angles.
    I had a little chuckle to myself one day on another forum when someone asked Jan " why not just make the Aprilia pipe fatter to make more power ".
    He simply said " bigger is not necessarily better , be it ports or pipes".
    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. #31018
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    8th February 2007 - 20:42
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    TZ400
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    It has been done properly by these guys.
    50cc 24.5Hp 18000.

    https://www.facebook.com/sprintperfo...930050083/?t=0

    Notice that it takes full throttle and pulls hard at 10,000 and then spins past 18,000
    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.

  14. #31019
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    2nd March 2013 - 15:04
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    CBX125F NS50F NS90F NS-1
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    Lower Hutt
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    Quote Originally Posted by wobbly View Post
    It has been done properly by these guys.
    50cc 24.5Hp 18000.

    https://www.facebook.com/sprintperfo...930050083/?t=0

    Notice that it takes full throttle and pulls hard at 10,000 and then spins past 18,000
    Impressive!
    Wobbly, I was expecting to see fuel spraying out of the powerjet but didn't see that. Why would they have had it closed for the whole pull?

  15. #31020
    Join Date
    20th January 2010 - 14:41
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    husaberg
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    The Wild Wild West
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    8,968
    looks like ktm invented TPI a few years after Fletner
    2015 acccording to this blub intersting read with protypes pictures including an orbital collaboration
    Yet somehow not too long ago, less than two years we are told, there was the switch to the fuel injection model. It was using a lot of standard type parts like the injectors and sensors from the four-stroke bikes, as well as the in-tank fuel pump and filters. An oil injection system, necessity for clean emissions was already in use so that would be even easier. For sure the software would need to be all-new but KTM had a great location of the injectors in the rear transfer ports which would be very key going forward. Shooting fuel in here is about as close to the combustion chamber as possible but also as far away from the exhaust port as possible. This allows the fuel now mixing with the oil/air mixture to get into the combustion chamber, stay there and fill up–then also get bounced back by the return wave inside the exhaust while the exhaust port is still open. KTM showed journalists some of the engine modeling and how this whole two-stroke thing works,
    Read more at https://dirtbiketest.com/fresh-dirt/...idhLc79kme1.99
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    https://dirtbiketest.com/fresh-dirt/...wSGM5SqJfjA.97
    Quote Originally Posted by Katman View Post
    Suck my cock




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

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