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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.

Page 5 of 5
  1. gunner

    gunner Member

    Always good to see a thread brought back from the dead
     
    gunner, May 27, 2020
    #81
  2. jeeper50

    jeeper50 jeeps 'till I die

    jeeper50, May 27, 2020
    #82
  3. gunner

    gunner Member

    gunner, May 27, 2020
    #83
    jeeper50 likes this.
  4. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    OTH, some early vintage cars (including Rolls Royce, etc) had TWO complete ignition systems, even twin spark plugs. Kind of like aircraft.
     
    PeteL, May 27, 2020
    #84
  5. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    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
     
    Howard Eisenhauer, May 27, 2020
    #85
    jeepstar likes this.
  6. ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Like a rotary. :sneak:
     
    ITLKSEZ, May 27, 2020
    #86
  7. jeeper50

    jeeper50 jeeps 'till I die

    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.
     
    jeeper50, May 27, 2020
    #87
    CCC.CB and fhoehle like this.
  8. Jeepsterjim

    Jeepsterjim Member

    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.
     
    Jeepsterjim, May 27, 2020
    #88
  9. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor


    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.
     
    PeteL, May 27, 2020
    #89
  10. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Thats one benefit but you may have noticed that when he do the mag checks rpm dropped off when running on only one.
     
    Howard Eisenhauer, May 27, 2020
    #90
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