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Jabiru 12 Pole Alternator modification / upgrade

Discussion in 'Jabiru' started by Bluboyz, Oct 3, 2013.

  1. Bluboyz

    Bluboyz New Member

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    Jabiru Au - has a modification procedure for their 12 pole alternator upgrading it's useful rpm charging range, and they have released an Engineering Report to this effect.

    Basically this involves changing the present stator winding's terminations from a parallel connection to a series configuration, and this should produce 12 volts @ 900 rpm instead of 12 volts @ 1800 rpm, and may assist with battery charging during low rpm operations although limited.

    www.jabiru.net.au/images/AVDALSR087-2_12_Pole_Alternator_Mod.pdf or can be found under:- Manuals, Maintenance Persons Information.

    Happy Landings
  2. frank marriott

    frank marriott Active Member

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    One done locally, and works as listed.
  3. Bruce Tuncks

    Bruce Tuncks Active Member

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    I wish my regulator was charging closer to 12 volts than it does. With a digital meter connected directly to the battery, the voltage reads 14.49 volts as soon as the charge used for starting is replaced, and this is usually even before takeoff.
    Now the advice about charging voltages is that 14.2 is a sensible maximum , and 13.8 is better for long flights if you want to maximise the life of the battery.
    Does anyone know if it is possible to adjust the output voltage of the Jabiru regulator?
    regards, Bruce
  4. geoffreywh

    geoffreywh Active Member

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    not adjustable Chinese unit (in the unkindest way) Check with City Auto Electrics in Melbourne, ( Motorcycle electric specialists, Real experts!)
  5. Bruce Tuncks

    Bruce Tuncks Active Member

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    Hi Geoff, I happen to be in Melbourne this week, do those guys know about Jabiru regulators or are they just good at motorbike electrics? Or is there a better regulator from a motorbike ?
    regards, Bruce
  6. geoffreywh

    geoffreywh Active Member

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    no, they are experts in regs. generally. They will know what to use, I believe they had their own made. I never had a failure from any of their bits in 20 years.

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