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