Hi Neil;
First, my apologies for not answering your earlier
question sooner, but it's been a busy week.
I'm not certain which dimension that you were looking for,
but with it in place it is difficult to measure anything but
the rotor cup.
Those measurements are 6.3" OD on the cup and after I
machined a little off the face edge of the cup I was left with
1.35" thickness. Looking back at my report it looks like I had
to remove a total of about 0.156 off both sides of the cup to
make it fit so it was probably about 1.5" thick originally. At
the time I did this I had detailed notes on every possible
dimension, but that was some years back.
Not knowing enough about your PSRU, I can't say for
certain which would be a good fit, but from what I can see of
the Racemate, while it is a good solution for the purpose in
which it was intended as a belt driven waterpump alt, I think
if I was to do it again, I would not hesitate to use the
Harley style again, rather than pay extra to modify something
that is well designed for the other end of the engine.
But I would not buy it from the local Harley shop ever
again as I paid far too much for it. I would use the Compufire
#55540 kit with rotor, stator & regulator which can be
bought at Amazon.com right now for $197.64 usd.
This would be your most cost effective way to add it in and
apparently Compufire is manufactured in the USA. (for those
worried that it is a cheap Chinese knock-off)
As far as machining costs, once again I do not know the
details of your design, but with mine the greatest difficulty
was in doing it as a one off design. But if I was to have been
doing a bunch of them, I don't think the additional machining
would be too onerous, but would not be able to put a dollar
amount on that work. And of course, outside of machining and
parts costs, you've got to cut yourself a little something as
profit for this venture.
Now with that said, to answer your current question if we
think it would be worth it, I would say yes. I've been doing a
fair bit of ground testing for unrelated issues but as I
disconnected my main alternator in order to access oil lines,
I've been running on the back-up PM alt only and it is working
flawlessly. Even with both working I can switch seamlessly
from the main to the back-up with only a slight volt drop of
0.4 due to different voltage regulators.
It seems like a lot of money, but in my opinion it is
better money spent than on a back-up lightweight battery. Of
course I won't be a customer since I already have it and my
opinion is biased, but while I could list more than a handful
of things that I wouldn't do again, this isn't one of them.
I would do it again in a heartbeat.
Todd