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To Pertronix, Or Not Pertronix...that Is The Question

Discussion in 'Early CJ5 and CJ6 Tech' started by TonyM, Oct 25, 2019.

  1. May 27, 2020
    gunner

    gunner Member

    Washington state...
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    Always good to see a thread brought back from the dead
     
  2. May 27, 2020
    jeeper50

    jeeper50 jeeps 'till I die

    Gawja
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  3. May 27, 2020
    gunner

    gunner Member

    Washington state...
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    jeeper50 likes this.
  4. May 27, 2020
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    OTH, some early vintage cars (including Rolls Royce, etc) had TWO complete ignition systems, even twin spark plugs. Kind of like aircraft.
     
  5. May 27, 2020
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Was not aware of that. :cool:

    I've been :schooled: :)

    But the reason aircraft have two plugs is that the pistons/cahmbers are so (#$@$ big across they need two plugs spaced as far apart as possible to get all the mixture to light off at the right time.

    You've been :schooled: :D
     
    jeepstar likes this.
  6. May 27, 2020
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
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    Like a rotary. :sneak:
     
  7. May 27, 2020
    jeeper50

    jeeper50 jeeps 'till I die

    Gawja
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    Don't forget the real reason...two plugs per cyl means you won't be the first ones to the crash sight when one fails.
     
    CCC.CB and fhoehle like this.
  8. May 27, 2020
    Jeepsterjim

    Jeepsterjim Member

    Lincoln, CA
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    I had a 1940 Nash Ambassador with a straight 8 and it had dual sparks plugs and wires coming from one HUGE dizzy cap. we pulled one set of the wire off to see what how the motor would perform and the motor dropped 300 RPM and was sluggish on quick throttle. A very interesting motor.
     
  9. May 27, 2020
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    Didn't know that, although some Harley guys do go with twin plugs for supposed performance.

    When I've flown in small planes the pilot always did a pre-flight check of one magneto, then the other, comparing rpm. I assumed that they were redundant systems for safety reasons.
     
  10. May 27, 2020
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Thats one benefit but you may have noticed that when he do the mag checks rpm dropped off when running on only one.
     

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