I'd like to see this idea succeed, as while I'd love to have a small PM
alternator as a back-up, I won't do it if it is belt driven at the same
end as the main alt.
A few years back, somebody on the list was considering
fabricating a small pulley to fit in between the flex plate on the PSRU
end of the engine. This would obviously be a real pain to change this
belt, but would be IMO much better than having to belts driven by the
front pulley. I don't know if anything ever came of this.
Another suggestion was made to use the stator from a 2-stroke
engine, mounted directly around the shaft. Since I just happened to have
a spare one for my snowmobile from years ago, I looked into this, but
decided that it was just way too much modifications to make it work. Now
they are selling waterpumps that have a built-in alt using this same
idea and I can't help but thinking how sweet it would be if I could do
this. When I originally looked at the possibility I was considering the
front end, but now I'm going to take a long hard look at the possibility
of mounting around the shaft at the flex plate. I doubt that there is
anywhere near enough room, but it's worth looking into.
Todd



The alternator that is 80% efficient and is pushing 50A requires just
about 1Hp.
What I've seen of the gears, unless they're made of pot metal, I don't
see how they couldn't be stout enough.  I haven't rebuilt my engine yet,
so I'm going off drawings (probably not to scale), and measuring the
gear on the CAS.  I think I calculated the torque at considerably less
than 10in.lb., but I'd have to find the napkin that I calculated that
out on 8*)