Why buy an expensive rectifier?

Discussion in 'Mechanics Garage' started by bigoledave, Jan 15, 2018.

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  1. Blackslide

    Blackslide New Member

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    So I still see lots of recommendations to install the FH010AA, FH012AA, etc. They are mosfet, but they are still shunting type.

    I've read that the newer serial style R/R SH775 (35Amp, max 10krpm?) and the bigger SH847 (50Amp, max 14krpm?) are a lot better on your stator, and they don't heat up as much. Apparently we don't need 50Amps but the rpm limit looks to limit the choice to SH847.

    I've yet to find one for cheap, though..

    I've read stuff here: http://v4musclebike.com/forums/showthread.php?t=26101
    and here:
    https://www.triumphrat.net/speed-tr...egulator-upgrade-2.html#/topics/104504?page=2

    Seems to be a lot of info when you scour around. But still tons of recommendations for the old style rectifiers.

    I'm going to go with the sh847.
     
    Last edited: Nov 12, 2018
  2. bigbadbass

    bigbadbass New Member

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    Shindengen is an OEM supplier for good reason...rock solid reliability.

    My used ebay FH010BA Shindengen Mosfets were around $40-$50USD 7-8 years ago. Mounted on both my 98 5th Gen and Ducati 900SS.....amazingly reliable, cool runners. And yes, a voltmeter of your choice a wise addition. I opted for a Signal Dynamics "Heads up" voltage monitor, a tiny LED (always in the "green" , easy connecting and mounting. 7-8 issue free seasons ....zero regrets here.
     
  3. Blackslide

    Blackslide New Member

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    Some previous owner had swapped the rectifier on mine, looks like the fh010, etc. Also there's a bunch of wires running back and forth, a green led on the fairing and two fans next to the rectifier.. I have no idea what the led is supposed to do? Sometimes it is on, mostly it stays off..

    Also under the seat there is a switch, that is only wired to the frame.. Had burglar alarm or something?

    I need to dig in and clean her up from all the mess..

    Riding on the storm
     
  4. NorcalBoy

    NorcalBoy Member

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    What you are experiencing is some genuine Jethro Engineering! I take it you aren't impressed :Eek:
     
  5. bigbadbass

    bigbadbass New Member

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    mosfet fh010.jpg mosfetwire.jpg

    This FH010BA was oem on the older 2004 era ZX10. Insignia and model # on the endplate indicates the real deal Shindengen (avoid the far east cheapo copies like the plague) and knowing the wiring code, it can be used in many applications.

    These run extremely cool, lukewarm at most....fan(s) not needed. I'd suggest to remove any/all added devices and associated wiring. Just more crap to go wrong...keep it clean and simple.
     
    Last edited: Nov 13, 2018
  6. Airfiddler

    Airfiddler New Member

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    There's an old saying. "buy cheap, buy twice" or maybe three or four times. If you're keeping the bike why buy cheap ? it's inexpensive for a reason. Poor quality components, shoddy quality control/testing. It will likely let you down (fail) at the most inopportune time a million miles from nowhere on a rainy afternoon when your cell phone battery is dead and there's no traffic on the road ............ it's happened to me. I learned my lesson. Now I do my research and buy the best I can afford. cheap/inexpensive will always have a market. It's just not for me. My 2 cents worth.
     
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  7. bigbadbass

    bigbadbass New Member

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    ^ Exactly what model/brand of voltage regulator left you stranded?
     
  8. mello dude

    mello dude Administrator

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    Garbage in... garbage out. (Have the tow truck on speed dial)
     
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  9. Blackslide

    Blackslide New Member

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    If the (ol) FH shunt type rectifiers run that cool, why are they even making the series type rectifiers? Apparently they are limited by the rpm of the engine, among other things?

    I'd assume that the new SH775 and SH847 would be improvements to the older shunt type rectifiers, but maybe not?

    Even junk bikes cost quite the money here, and I'm a bit wary ordering such a key component second hand from ebay.

    I'm looking at getting the FH020AA or SH847 new, but don't want to overpay for it.. Whole bike cost me about 1500eur with service and new helmet included to the cost.

    Riding on the storm
     
  10. bigbadbass

    bigbadbass New Member

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    "limited by the rpm of the engine" ?? Huh? I'm not seeing your point.

    As i posted, "pre-owned" Shindengen FH010BA in service on both my 98' 5th gen and my Duc 900SS *8* issue free seasons now. PS there are ways to test diodes prior to install, and an output test takes about 20-30 seconds to confirm running voltage output at various RPM. Adding an onboard voltmeter offers instant output status.

    Shindengen Mosfet far from "junk". However, beware the super cheapo far east copies all over ebay nowadays. Stick with genuine.

    I'm anxiously awaiting the answer as to specifically what brand rr failed on member @Airfiddlers bike. We all learn this way.

    Why the new series SH type? The inevitable march of time...manufacturers always modernizing, improving their goods. Witness the mosfet transistor was an improvement over its predecessors,
    as the SH series is an improvement over the mosfet. Doesn't relegate the mosfet to 'junk' status.
    The SH yet further advanced , yes, and more $$$ absolutely.

    Spend as you see fit, my friend.
     
  11. Blackslide

    Blackslide New Member

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    The SH775 rectifier doesnt, well, rectify the voltage at over 10k rpm. They fixed that in the bigger and slightly more expensive SH847. Also the SH775 can cope with about 35Amps of load, SH847 should be okay even for touring bikes with tons of electric drain on it.. Well up to 50Amp, I think the best of the old style gave more power.

    The main difference between shunt type anf series type rectifiers, is that if your bike uses 10Amps, the shunt rectifier drains, say 50Amps from the alternator and basically sinks the surplus 40Amps to the ground and vents some off as heat. The series type only drains 10Amps that the electric system uses.

    So the new type seems to make a lot more sense. Also, brand new FH020AA price seems to be only 30-50usd shy of SH775, maybe 50-70 from SH847 wich we apparently need (because of the 10k limit)..

    Riding on the storm
     
  12. NorcalBoy

    NorcalBoy Member

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    I guess I shouldn't be surprised that this is still going strong. MOSFET, If you can't do something right, don't do it at all. You wouldn't use a condom with a hole in it, just because it was cheaper.
     
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  13. Blackslide

    Blackslide New Member

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    FH08, FH12, FH14... all are MosFET, but are still shunt type rectifiers. They work like the old transistor rectifier, but are cooler since MosFET is more efficient and shindengen is making quality units.

    SH775 and SH847 are series rectifiers. So they are working in a totally different manner. Apparently this makes them hard to design a small, efficient and powerful serial type rectifier that will do its job well from idle to 14k+ rpm. But these units seem to strike a good balance.

    Although apparently both are good, SH type rectifiers make life easier on the stator, wich is not cheap to replace either.. Also, I guess most, not all, of the issues have been due to corroded loose connectors, compounding to the fact the parts don't get proper cooling.

    Riding on the storm
     
  14. bk94si

    bk94si Member

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    Last edited: Nov 17, 2018
  15. bigbadbass

    bigbadbass New Member

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    I trust Ricks both custom rewinding and their products. My Duc 900SS failed stator was NLA in 2010 , I trusted Ricks to do a rewind, I did the Mosfet conversion at the same time, actually finalized on 6/25/10... choosing to use larger wires, direct from stator to RR waterproof, sealed connector ......eliminating all mid connectors, for any testing I can simply pull the applicable connector at the RR if needed....but in 8 years of service...zero issues...no need. Ricks did a super reliable rewind job

    Ricks rewind work on my stator, coupled with the ZX10 Mosfet conversion has been faultless, fully reliable in service 8 years zero issues. I'd put my trust in both their custom work and products, but in the case of the VFR...would encourage you to eliminate the problematic mid connectors.

    And if you don't have an onboard voltmeter, add one of your choice, many options out there. Stator pic prior to insulation process, upped wire size from yellow (16 ga?) ) to black 12 gau. Note size difference, wired direct stator to RR connector. Rewired my VFR in same configuration...direct, no mid connectors. Can't find a pic ATM. I haven't had to touch the VFR in 8 years, The Ducati just once, an insufficient ground issue, my fault. Corrected, perfect since.

    stator1.JPG stator2.JPG
     
    Last edited: Nov 17, 2018
  16. Airfiddler

    Airfiddler New Member

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    As for the brand....was not on the VFR, too long ago to recall.
     
  17. Airfiddler

    Airfiddler New Member

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    Here's a photo of an SH847 mounted on my VTEC. This R/R is quite a bit larger than the stock unit, and is a very tight fit. The connectors are also quite a bit larger. This is the only way I could mount it without causing other interference problems with the wiring harness and radiator hoses. May not be ideal, but still in the cooling airflow. I made my own adapter plate out of 1/4" aluminum. The stock Honda unit was working fine. I did this as a preventative maintenance issue.
     

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  18. bigbadbass

    bigbadbass New Member

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    too bad, naming the failed culprit good for the knowledge base.

    A little tweakage a given when changing types and locations, usually minor stuff.

    The RR on my '98 VFR was getting smokin' hot to the touch, 30 seconds after cold startup....prompting my upgrade. Still working, but its condition was concerning.

    i forgot to add my 2010 mosfet conversions were done way before the new Shindengen series type existed, and i'm not sure roadstercycle was as prevalent on the scene as today, if they existed at all back in 2010.

    But no regrets here, certainly got my moneys worth outta these preowned, old ebay Mosfets.
     
    Last edited: Nov 17, 2018
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  19. Blackslide

    Blackslide New Member

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    Looks like it was intended to be there, from the factory. Great job!

    Riding on the storm
     
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