More R/R Tech - The difference with a Series style design such as Compufire

Discussion in 'Mechanics Garage' started by mello dude, Aug 31, 2012.

  1. mello dude

    mello dude Administrator

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    I ran across some great pictures of infared shots with this R/R from an Aprillia forum. The difference is the stator is not on 100% of the time.

    This is what its all about......

    [​IMG]

    [​IMG]

    [​IMG]


    What do you think rjgti?
     
    mello dude, Aug 31, 2012
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  2. rjgti

    rjgti New Member

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    it is alot cooler. do you have a spec sheet for the compu-fire r/r
     
    rjgti, Aug 31, 2012
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  3. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    I love data
     
    tinkerinWstuff, Aug 31, 2012
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  4. mello dude

    mello dude Administrator

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    I havent seen an actual spec sheet on this thing. --- Its actually manufactured as a Harley part. I kinda stumbled on this while looking at a Triumph forum. The more I read, the more interesting it got. Then I found some posts by posplayer. His work was the stuff that convinced me this is the way to go.

    Here is his links on the work and -- yea, real data.
    RR_Tutorial.pdf -- June 5, 2012 11:34 pm -- 837k
    SSR_vs_FH012AA.pdf -- May 31, 2012 10:20 pm -- 903k

    Here's a thread on using this in old 80s Suzukis
    Compu-Fire SERIES R/R Install - The GSResource Forums

    Both some Triumph guys and Aprilia guys were going that way to improve stator life. And I'm not the first VFR guy, there were several VFR guys on the other side of the fence to do this first. - --- I dont know what Compufire thinks about these conversions, I suspect they would prefer to stick to Harleys. But there's no denying they have a good product.
     
    mello dude, Aug 31, 2012
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  5. kennybobby

    kennybobby New Member

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    If you look at chart 10 in the comparison package when the SSR is "regulating" at 6K rpm, the stator phase to phase voltage (yellow trace on oscilloscope) is up to 260 volts ac. This is due to interrupting the stator circuit path for the current induced by the moving magnetic field of the rotor.

    This high voltage puts a stress on the varnish insulation of the stator windings and will eventually punch thru the insulation as the current is trying to find a path back to complete it's circuit. It may work for awhile, but time will tell how well the stator wires survive.

    In addition the circuit schematics drawn for the tutorial package are incorrect--the stator windings are totally insulated from the bike chassis/ground and are never connected to ground in the RR or otherwise.

    i read thru the entire GS forum discussion, and not one person mentioned soldering of the terminal connections.

    The culprit in failed rectifiers/regulators and wiring harnesses is the high temperatures from the [I^2 x R] heat produced in the high resistance junction of the crimp lug connectors used on the stator wires to the R/R.

    It won't matter what sort of R/R you use downstream of the stator wires if you are still using crimp lugs, it will fail.

    Only some hardley guys would be dumb enough to think they could somehow bypass the laws of physics, and actually build these things and sell em to other hardley guys...gotta love that 1930's tractor technology push-rods and straight open pipe exhaust--makes lots of power!
     
    kennybobby, Aug 31, 2012
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  6. mello dude

    mello dude Administrator

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    ^^^ The 260 volts is at zero current and then zero power. It wont be generating any additional heat with that. Less heat, longer life. The infared pic shows the differences.

    - I see your point on the stator ground, I expect the diagrams are there to show when the R/R does the "dump to ground" (as in shunt)functions.
     
    mello dude, Aug 31, 2012
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  7. Lgn001

    Lgn001 Member

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    It is interesting to think about the effect that the high voltage might have on the stator windings. Even though there isn't any... umm, appreciable (?) current flowing, there is still a voltage potential trying to find a path of least resistance. I did a quick search on magnet wire out of curiosity, and the minimum breakdown voltage seems to be about 500V on commercially available stuff, so it probably wouldn't be an issue. What is also interesting to think about is that the high voltage will also be present in the wires and connectors all the way from the stator to to the regulator.

    At the end of the day, though, if it works, it works. :smile:
     
    Lgn001, Sep 1, 2012
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