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Thread: Plasma Ignition | Plasma Jet Ignition

  1. #351
    Yesterday was a great day!
    I popped 2 x 25 6A10 diodes in one lick! My big capacitor, 2000vdc 80 uf has some power! The diodes popped when I the output from the MOT was about 1800 vdc. I am now making the diode stings from the ignition coil and from the booster cap 50 x 6A10. I would like to know if there is a rule of thumb for booster cap value and diode string voltage?

  2. #352

  3. #353
    Then the booster cap diode string of 50 6A10 (50KV) broke after some HV testing with the 2000 vdc 80 uf cap.
    I have 120 diodes left! Suggestions?

    Maxc, Great links, Thank you very much.

  4. #354
    Networking Architect Aaron Murakami's Avatar
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    Quote Originally Posted by ThankyouBedini View Post
    Yesterday was a great day!
    I popped 2 x 25 6A10 diodes in one lick! My big capacitor, 2000vdc 80 uf has some power! The diodes popped when I the output from the MOT was about 1800 vdc. I am now making the diode stings from the ignition coil and from the booster cap 50 x 6A10. I would like to know if there is a rule of thumb for booster cap value and diode string voltage?
    That 80uf at 2kv is huge - do you have a cap around 20uf max? With my MOT charging a cap bank for the big booster cap blasts, the most voltage I was able to charge up to was about 1200v and I believe the capacitance was about 20uf at the upper end.

    If I can even find some of the caps I used, I can see what they were then calculate the actual capacitance I had when putting them in series.
    Last edited by Aaron Murakami; 04-10-2015 at 10:59 PM.
    Aaron Murakami





    You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete. ― Richard Buckminster Fuller

  5. #355
    Quote Originally Posted by Mika View Post
    ...Do I need a cap for each plug or can I connect two plugs parallel in a same cap? I ordered two caps and hoped that's enough...
    Hi Mika, sorry for not answering this - it is also important!

    The "law" for COMPONENTS connected in PARALLEL to a Power Source state that the Volts will be the SAME for each component, BUT the Amps will DIVIDE according to each components RESISTANCE. How does this APPLY to your Rotory Plasma Ignition System?

    (1) 1 Inverter connects to 1 Bridge Rectifier, and 2 Caps connected in parallel to that Bridge - so each Cap will get the SAME "charge" from the Inverter - no matter what they charge to.

    (2) It looks like the RX-8 has ONE COIL per Spark Plug, so each individual Spark Plug Circuit is SERIES.

    (3) The DIODE STRING of each Spark Plug in a Pair connects to one side of 1 Cap.

    So if you did have a Capacitor per Spark Plug, they all would have charged to the SAME VOLTS, but would have each only got say a 1/4 of their "potential amps". Each spark plug then will have the same "amp potential" from its own cap.

    With your current 1 Cap per 2 spark plugs, the cap will be at the SAME voltage for each spark plug, BUT output "amps" will SPLIT between the 2 spark plugs.

    The real issue, and FIRST STEP is:

    Please check what the HV OUTPUT POLARITY of each coil is - does each put out Negative or Positive HV?

    Maybe all 4 coils (if I'm seeing correctly that they are 4 individual coils) might have the same HV Output Polarity - but its NOT so until you've check that it so.

    You need to know which way round your Diode Strings need to go onto the Spark Plugs with your Caps, Bridge and Inverter orientated accordingly.

    Many people have blown several sets of inverters, until they got at least the polarity orientations correctly matched and orientated to HV OUTPUT.

    So discover what the HV Output Polarities are, FIRST.

    Whether the spark plugs are fired HV negative or positive will dictate what the next step will be...
    Last edited by Willem Coetzee; 04-13-2015 at 12:42 AM.

  6. #356
    Thanks again, William.

    This is maybe a stupid question, but how do I determine which way the polarity is?

  7. #357
    Quote Originally Posted by Mika View Post
    Thanks again, William.

    This is maybe a stupid question, but how do I determine which way the polarity is?
    (1) Diode String Method: Negative is at the side of the line across the diode and positive is the side opposite - so if you put a diode string in series between spark plug and spark plug HT lead with diode (-) on HT lead and diode (+) on spark plug, the spark plug will fire if it has an HV NEGATIVE output; if it doesn't fire that way round but fires when you connect the diode string in series the other way round, the coil fires POSETIVE.

    (2) Graphite Pencil Method: when the HT lead is held say 1/2 inch away from spark plug and the sharp point of a wooden pencil with graphite senter held halfway in between the HT lead connector and spark plug, the jumping spark will make feathery sparks in the direction of POSITIVE from NEGATIVE... so if it makes spark feathering the direction of the spark plug, the coil fires HV NEGATIVE, and if the spark feathers in the direction of the HT lead connector the coil fires HV POSITIVE.

    There are other methods too, using maybe a compass or HV-instruments as well, but the above 2 might be the easiest.

    I prefer the pencil metode myself, because with enough darkness I can see the feathering direction better, and don't blow a diode string by accident.

    The amp-rating of the diodes you ordered is right, so if you use the diode string method, rather use 30-50 diodes in series in your test string, cause I got no clue with the Voltage Output of each of your HV coil secondaries are - you don't want to blow them by accident and then have to order them again.

    Please check each coil - don't assume the polarities.
    Last edited by Willem Coetzee; 04-13-2015 at 09:04 AM.

  8. #358
    Ok, thanks, I'll test that soon. These are the components I'm going to use. 200w 220v inverter, 50A 1000V bridge rectifier and two 450VAC 50/60Hz 4uF caps, maybe I'll order two more of those too. Four 100 ohm 100w power resistors also, but they have not yet arrived. Do these seem right kind of parts?

    image.jpg

  9. #359
    Hello!
    I am looking for help so that I can understand the term "negative resistor" better.
    Where and how is a negative resistance used?
    How is a negative resistor made?
    There is some talk about it here, but I just don't get it!
    Thank you very much!
    Last edited by ThankyouBedini; 04-15-2015 at 11:24 AM.

  10. #360
    Hey can you tell me will this plasma ignition fix misfires too, or will it only make a plasma spark "after" the original ignition parts get an ordinary spark through first? If you understand what I'm trying to say...

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