Hi Paul & Group,

I'm going to use the stock Renesis alternator on
my Bush Caddy project, but I can't find a supplier
for a larger pulley.Does anyone know of a supplier,
or have any information on what other pulley might
work?I have found sites that sell the eccentric
shaft under speed pulleys but I don't want to
change that pulley just the alternator.

Thanks,
Bob
Upstate NY

In the over all scheme of things the speed
of the alternator should be down on the list.
Have you some info that suggest the alt.
will fail if not slowed down?

Paul Lamar

Bob,
I used a 4" alternator pulley from Canton Racing.
See

http://www.cantonracingproducts.com/cgi-bin/commerce.cgi?preadd=action&key=7
3-209

Mark S.
Austin

Mark is using a 20B which has a lower redline than the
RX8 engine.

Mark, how is the p-port sealing coming?

Paul Lamar


On the subject of pulleys; for redundancy I was hoping to double belt the
water pump and alternator. I have a dual v-belt alternator pulley but I'm
having trouble finding compatible dual belt water pump and e shaft
pulleys.
I'd be just as happy with a serpentine belt as a v-belt if only I could
find
compatible matching pulleys.
Jay

You have a 20B right Jay?
13B stuff should fit. Check with Mazdatrix or Racing Beat.

Paul Lamar



I think it's important to be able to inspect the belt before each
flight, or at least once per day. You'll need a cowl door in the
right place to make this possible. If you can inspect the belt before
each flight, I think the redundancy of double belts may not warrant
the complication and weight.

You might need double belts if the total horsepower absorbed by the
accessories pushes the capability of a single belt. As well, double
belts should run slightly cooler, especially in an environment where
heat isn't being properly controlled/vented.

I'm not totally against double belts, just wondering about the value
in terms of improved safety. Is a properly installed belt, inspected
regularly, any more susceptible to failure than any single oil or
coolant hose? How many times will the redundant belt survive having
it's sister belt thrown?


Regards,

Matt-

Good points Matt. Keep it up and you'll talk me out of it.
Any other opinions/experiences on dual belting the alt. and water pumps?

Jay


You do want to keep your wires away from those belts.
A rotary powered airplane crashed when a failed belt took out
the ignition wires. Happened decades OK.

Paul Lamar