fan on rectifier (R/R getting hot)
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Thread: fan on rectifier (R/R getting hot)

  1. #1
    Biker
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    fan on rectifier (R/R getting hot)

    hi guys!

    has anybody tried attaching a CPU Fan to their rectifier/regulator? my R/R seems to get hot and I don't see any ducting that directs any air to it.

    so i was thinking that either I relocate the R/R to some place with enough moving air, install a small aluminum duct to direct air or simply install a 12V PC Fan.

  2. #2
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    The common mod is to apply thermal paste to the back, or upgrade to a MOSFET based R/R.

  3. #3
    Biker the benz master's Avatar
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    i personaly use a CPU heatsink (from pentium2, fits great) on my regulators with thermal paste in between. This one is on my VTR250 but i did pretty much the same with the CBR. Didnt keep the fan tho, there was not enough space.


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  5. #4
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    i'm using a Shindengen SH532-12 R/R
    it does have a big heat sink but its location on the MC22 just does not allow any air to ram in and cool the heat sink.......so maybe I will put a little PC fan......or relocate it somewhere.Name:  42-108-large.jpg
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  6. #5
    Biker Slipry's Avatar
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    i have mine in stock position

    it gets hot but hasnt failed yet.

    heat sink for piece of mind but my experience is that its built to get that hot - and has
    Quote Originally Posted by schultzy View Post
    I stuck a battery up my arse.
    Yeah, that's a cool story...

  7. #6
    Biker the benz master's Avatar
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    they do fail without heat sink. At least on the VTR they do, but it's located even further down under the covers, gets about 1/4 of the airflow the CBR has. I actually think the CBR regulator is placed properly to get good airflow.

    So unless you live in the desert or do lots of stop and go trafic in tropical weather, if it's got an heatsink it should be fine.

  8. #7
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    mine is located at the right side behind seat.

    i noticed it does get hot, so maybe the heatsink and fan would be another project.



    my Shindengen SH532-12 regulator has:
    3 yellow wires for the 3-phase stator
    1 green wire for negative/ground
    1 red wire for positive
    1 black for MONITORING the voltage

    I just connected the black and the red wire together, BUT some people say that the black wire (MONITOR) should be connected to the ignition switch

    I'm thinking of trying this but I'm not really sure which wire would lead to this ignition switch.

    Can you guys help me? Perhaps anyone has some pics that could help
    Last edited by lethaldriver; 14th April 2015 at 06:25 AM.

  9. #8
    Biker the benz master's Avatar
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    yes, behind drivers seat, lots of openings in the fairings around there to allow air flow.

    From what i know, the black wire is used to prevent the magneto from trying to charge the battery while you use the starter to turn the engine over. I'm not sure how it has to be connected in order to have this function tho.

  10. #9
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    yes there are openings and lots of them but there is no ram air effect. the fairings are streamlined to be aerodynamic which is good.........
    but the area where the rectifier/regulator is located seems to just have "still" air....a little ram air effect would aid in cooling.....or a small fan to force feed the air.


    i was thinking of using a resistor in series with the black wire to "fool" the rectifier that it is producing less voltage than it actually is....and so it will raise the voltage until it thinks it has reached the set voltage.

    My rectifier seems to limit the voltage to just 13V...............I'd rather have this than an overcharging regulator.
    I've seen my bike reach higher voltages with a different regulator and I'm fortunate that it did not destroy my CDI.

    I think the charging voltage should be somewhere at 13.5 to 14V.


    My bike seems to have a weak battery after using the headlights for a while......
    I just use a battery charger to top up the battery.
    Last edited by lethaldriver; 15th April 2015 at 12:08 AM.

  11. #10
    Biker the benz master's Avatar
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    Unfortunately, there is no such thing as ram air effect, at least not under 150-200 kph.
    I was very skeptical untill i did some math and CFD on that.

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