Quote:
Originally Posted by Luddite
Negotiating your way through all the Shindengen R/Rs is a real minefield, Spuggy, especially as Shindengen themselves don't appear to publish a list of all their models and types, (at least I've never managed to find one).
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Indeed; The closest I've found was this:
https://2fiftycc.com/index.php?threa...tifiers.10005/
And although that list is quite useful, the very first entry (for an SH775) is incorrect, as that unit isn't a MOSFET Series R/R....
Quote:
Originally Posted by Luddite
It also doesn't help that, despite producing products with fundamentally different circuitry, Shindengen uses the same labelling system to identify them all - SH775, SH821, SH847 - you can't tell from the model no. which is shunt and which, if any, is series. It would be much simpler if the series type had its own dedicated suffix (they do identify the MOSFET type with an 'F' after all). But that would make life too easy, wouldn't it?!
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LOL... Where would we be if /anyone/ could look up accurate, definitive technical information easily, at the click of a button, eh? Oh, wait, right - pretty much anytime from the tail-end of the 20th Century onwards....
As you appear to have a corporate A/C with those guys (required to open an account/ask web-form questions - understandable given they're 100% OEM/zero retail), would you be in a position to ask for specific datasheets? Or technical questions?
Reason for asking is that the SH775 is an 35A SCR-based series R/R. It used to be dirt-cheap ($60), but now is much more expensive (like $192 as a Polaris OEM part), and is known to have at least one problem;intended for an ATV, it doesn't regulate over some high RPM - variously reported to be 9,000 RPM (strongly disputed by guys who've measured theirs at this), or 10,000 RPM.
In the absence of any real evidence, looks like you could choose what you want to believe:
https://www.vmaxforum.net/threads/re...-esr279.47773/
https://www.triumphrat.net/threads/a....748962/page-2
And even Jake is only repeating what some customers have told him, apparently
https://v4musclebike.com/forums/show...ndengen&page=3
(BTW, page two of that thread has a video of a chap statically rev'ing his bike to 10,000 RPM, and the voltage output from the SH775 remains constant - another guy in the same thread says he had the SH775 fitted and working perfectly for 2 years before he even heard there was supposed to be an issue over 10,000 RPM)...
But it'd be really, really nice to have a definitive statement from ShinDengen... Apparently, some of those Triumph 4's are red-lined at 14,000, 16,000 RPM (wow,
...). I can see how any limit would matter to them.
Jake used to supply the SH775. He now doesn't, and recommends the SH847 instead - because gets them for almost the same money. He has expressed concerns regarding the SH775 and the RPM limit; he isn't convinced that the shutdown it performs when this limit is exceeded (which he states as 9-10K, so quotes 9K to be conservative) is non-harmful to the unit itself. From his POV, the SH775 is potentially problematic for some and very close to the same price as the SH847 - which has more capacity and works with everything...
I can see exactly where he's coming from. but
- the SH775 can be sourced cheaper (like ~50% cost) of the SH847,
- I kind of doubt any intentional unit shutdown is harmful to the unit (resumes regulation as soon as RPM drops back into range, apparently) - I'd be much more concerned if it went over-voltage/over-current/out-of-regulation entirely - and the only reports indicating that this is what it does don't seem especially credible/backed up by any measurements...
- I remain unconvinced that a 10K RPM design limit is a serious issue for most V-twins..