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  1. #76

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    RE: Opensource CDI ignition

    Hello, is it possible to post a PCB design for a small version?

  2. #77

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    RE: Opensource CDI ignition

    You can find all information on this site (incl free pcb and schematic programs) to print and designe the pcbCDI-ignition
    CU, Rob - www.modelbouw.gompy.net

  3. #78

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    RE: Opensource CDI ignition

    Hi to all,

    can anybody give me the Information whatΒ΄s the correct mounting-position of the Hall switch (Pickup) on the Engine ?
    I was reading in the "Source1.asm" something about 36 Degrees. Means that 36 Degrees before or after
    upper piston dead center ?

    Thanks in advance,
    Tom (from Germany)

  4. #79

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    RE: Opensource CDI ignition

    Allways before.
    36 degrease is 5 ms, and this is the timetable in the PIC.
    On 36 degrease, the table is from 5 till 0 ms.
    You can change this table if you need a other timetable for your ignition.
    If the delay must be greater, you have to recalculate the table.
    Ignitiontime
    CU, Rob - www.modelbouw.gompy.net

  5. #80

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    RE: Opensource CDI ignition

    Hi Powerboat,

    Mount the hall at 36 degrees before TDC.
    Regards CharlieM

  6. #81

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    RE: Opensource CDI ignition

    Thanks, this information will help me !!!

    In the next few dayΒ΄s I will build this Ignition and try to convert a weedeater Engine with this.
    Mechanically I have modified it with a Watercooled Head and another Carburetor (Walbro from Zenoah G260 PUM).
    Hope it will work !

    Thanks again and CU,
    Tom (from Germany)

  7. #82

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    RE: Opensource CDI ignition

    You can't use the original flywheel from your weedeater.
    On this flywheel there are 3 magnets, you need only one.
    Please be carfull with your new flywheel, the magnet must be tyd very strong.
    You need also the same wight at the other side of the flywheel for balans.
    Normal weedeaters have ~6 a 8000 rpm, with cdi 2 a 3000 more.
    BTW, you need also exact the wight of your old flywheel for your new flywheel.
    The engine need this wight to run smooth (contra wight for your cranck)
    tuning
    CU, Rob - www.modelbouw.gompy.net

  8. #83

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    RE: Opensource CDI ignition

    Hi Rob,

    thanks, but this is already done ! The new Flywheel is near the original Flywheels weight (5 grams lower). The Neodymium-Magnet (with Southpole outside) is pressed in very tight (additional 5-minute Epoxi applied). In cause of more RPM maybe i have to install some new (better) Ball-Bearings ??? Also I want to use the H501 Hallswitch (Unipolar type) from www.Conrad.de with the ordering code 185120-62. The Voltage Range is between 4,5 Volts and 24 Volts and the Switching Frequency is 18 KHz maximum.

    What do you think about this Hallswitch ? Do you think this one will work fine ???

    Regards,
    Tom

  9. #84

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    RE: Opensource CDI ignition

    Hi Tom,

    I use also the one you have and function very good.
    I test this hall with 30.000 rpm, no problems.
    If your engine isn't old (or stand still for a long time), you don't need to upgrade the ballbearings.
    Most bearings can handle the 10 a 15.000 rpm easly.
    My weedeater (Homelite 25cc) is about 10 years old and it run 12.000 rpm on the boat.
    CU, Rob - www.modelbouw.gompy.net

  10. #85

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    RE: Opensource CDI ignition

    Hi Rob,

    the Engine is brandnew, it was never running before !!!

    I have no big experience with CDIΒ΄s, the engines I was using before, just had the standard Magneto Ignitions.
    In this case, itΒ΄s good to talk with an Expert in these things - this will help to prevent some big mistakes !

    Best Regards,
    Tom

  11. #86

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    RE: Opensource CDI ignition

    Use some more oil (1:18 instead 1:25) the first 5 liter and set the neadle a littlebit to muts (1/8) open.
    Maybe you have to change the table in the PIC, I don't know the ignitionpoint of this engine.
    Now it will walk from 36 degrees till zero degrees.
    If your engine is startup on 25 degrees, your engine isn't start very well.
    You have to calculate a new table into the PIC.(see asm-file)
    CU, Rob - www.modelbouw.gompy.net

  12. #87

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    RE: Opensource CDI ignition

    Hi Rob,

    thanks for These Tips, when IΒ΄m finished with the CDI I will try it out. If it is not working properly with this Table, then i have to calculate a new one (holy cow, hope i will have the knowledge to do this) []
    OK, if tere is a will, there will be a way - I think I have to learn more about this

    Best Regards and Good Night,
    Tom

  13. #88

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    RE: Opensource CDI ignition

    ORIGINAL: Bigboat

    I find this transformer in a old computer-powersource.
    I use also normal scotch-tape, I don't dip the coil jet.....first it have to work properly (thats now)
    Hey Bigboat, nice web page you have done. Just a question about the transformer. Is that form an AT or ATX power supply?

    What next did you do with that transformer. Did you leave the original coil or did you wind a new one on it?

    Thanks,
    Tomi

  14. #89

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    RE: Opensource CDI ignition

    I wind me a new coil (just ready) with 550/10/15 wdg on a small ferritring (16mm outside, 10mm inside, 8mm high)
    In old (AT) powersupplys you don't find small ferritrings, everything was big at that time
    You can also find small ferritrings into other equipment like dustcleaners aso (motor inside) and radio's.
    Tomorrow I fit the new transformer, I let you know wat the results are.
    CU, Rob - www.modelbouw.gompy.net

  15. #90

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    RE: Opensource CDI ignition

    Update 23 Jan 2006
    I wind me some other ferritcoils and findout not all ferritrings will work.
    -If the ring is to small, the oscillator don't startup.
    -If the ring isn't a HF-ring, the oscillator don't startup.
    -If the ring is to big, the oscillator don't startup.
    The ideal ferritring is ~18x10x7mm (collor yellow/white U=120, 4C65 or FT37 or K3 7X type all HF)
    You can find this rings also in old TV and/or radio-sets, and your local supplyer.
    I wind the coil 550 x 0.1mm, 10 x 0.1mm and 20 x 0.5mm (20 can be less, but at least 15 wdg)

    Why smaller ferritcoils not (?) work.....
    In the original designe, the ferritring was 27x15x12mm and the lenght of the total wire will be (27-15=)12+12+12=36mm for one turn, 450x36mm= 16.2 meter.
    If you're using a smaller ferritring, you've to wind the *normal* lenght.
    For a ferritring of 16x11x9mm, one turn will be (16-11)5+9+9=23mm
    The total windings are now 16.2 meter / 23=705.......you're missing 250 windings of the original coil.
    Also with the other windings, recalculate the lenght and your coil will work too !



    If you will use this igniton for a race engine, you have to rotate the timetable in the original assembly-file.
    The original table starts at 36 degrees delay untill 1200 rpm, wat means the ignitionpoint is on top (BTC), is 0 (zero) degrees.(pickup on 36 degrees before BTC)
    With 0 degrees you never get start the engine, you need some degrees before BTC to start (small engines about 25 till 30 degrees).
    When the engine speedup, the ignitiontime will be greater, with other words....the ignitionpoint will walk to 36 degrees BEFORE BTC in the original timetable.
    The engine will be slowdown and the enginepower goes down (in cars thats normal....safes petrol.....but thats not wat we want.
    We want more prm and more power in the (race)engines, so you have to change the timetable.
    I'll put two new files on my site named zenoah2.asm and zenoah2.hex, in this files the timetable is allready be change.
    Now it possible to speedup the engine to 16.000 rpm and even more [>:]
    The timetable is experimental and not for all engines the same, so you have to change it for your (race)engine.
    CU, Rob - www.modelbouw.gompy.net

  16. #91

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    RE: Opensource CDI ignition

    Hi, i have a problem, the IC IR2153 not exist in my country. I am designed this circuit (My Circuit (IR2153)), i'ts correct??????, what is the frequency the IR2153???
    Tnk's.
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  17. #92

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    RE: Opensource CDI ignition



    Hi javipallinux,

    Here is a link to the datasheet.

    [link]http://www.irf.com/product-info/datasheets/data/ir2153.pdf[/link]
    Regards CharlieM

  18. #93

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    RE: Opensource CDI ignition

    Hi javipallinux,

    This schematic will also transform the voltage up NE555

    BTW, wat is the reason to put the CDI on 12 Volt ?
    Will you use it in a car ?
    CU, Rob - www.modelbouw.gompy.net

  19. #94

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    RE: Opensource CDI ignition

    This circuit its for 125cc engine for racing (kart), and works with 12v 7A battery.
    I see the schematics the ir2153, i do not deal the frequency the work
    Please help me.
    Tnk's.-

  20. #95

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    RE: Opensource CDI ignition

    Why don't you use a *normal* CDI without a programble microprossesor ?
    I don't think you need one, programble CDI's will only get more power and rpm's from a engine when this engine run on top off wat the engine can do.
    A CDI without the a PIC can do the job for you, Example
    This is a elctronic ignition, not using a micro at all electroni-ignition
    Last schematic will cleanup the spark and make it strong and allway on the right time.
    CU, Rob - www.modelbouw.gompy.net

  21. #96

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    RE: Opensource CDI ignition

    Not it need whit programble microprossesor............. please tell me what is the frequency the IR2153

  22. #97

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    RE: Opensource CDI ignition

    Depent of the rpm of your engine.
    If your engine makes 5000 rpm, the IR2153 must ocsillate at least at 2500 puls/m on one of the outputpins.
    The bridge makes two positives pulses from the output of the transformer to load the capacistor.
    Every spark nead atleast 1 positive puls from the bridge to load this capacistor.
    Better is to chose a 10x higher ocsillate of the IR2153
    CU, Rob - www.modelbouw.gompy.net

  23. #98

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    RE: Opensource CDI ignition

    In the datasheet of ir2153 the frequency its calculated by Rt and Ct, according to the table with Rt=33K and Ct=1nF, the frequency its approximately 20Khz; it is correct????

  24. #99

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    RE: Opensource CDI ignition

    Yes, follow the yellowline.
    20.000Hz, 1nF, ~30kOhm.....30kOhm doesn't exist, next value = 33kOhm.
    CU, Rob - www.modelbouw.gompy.net

  25. #100

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    RE: Opensource CDI ignition

    Does anyone knows the exact values for the resistors in the original low tension TIM 4 cdi module,for a continuous work with a 4.8 V power source?
    ..and eventually their values for a 6V continuous operation? (modelectric coil)
    Engine on test is a O&R 23,year 1948.
    Piero


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