norm2 wrote:

Also, Mazdatrix sells a pulley for the crank to slow down the belt

speeds.

I would not do the water pump pulley trick just yet. That is mainly for

racers that

will run the engine well over 8500 RPM.

Paul Lamar

Gary Buster wrote:

Wow, Paul... why not????   IMHO, this was the main reason I am able to not
replace alternators so often... the bearings just can't handle my 7k
continuous1-1.5 hour rides... I knew when the armatures were wearing when my
headset had a whinning that mimicked the engine rpms... replaced alt and the
whinning was gone (each time!)

with the engine getting close to the advertized cavitation speed, I went
ahead and replaced the pulley and slowed the stuff way down... hasn't hurt
any performance stuff, water is still the coolest thing on the ship!!!

I ask again... why not?... let me in on the rest of the story... what else
am I missing??

Gary Buster
Tyler, Texas
12a tandem gyro

Your PSRU is 2.85:1 (I think) Gary and most airplane guys are running 2.17:1.
We rarely see 6300 RPM. We cruise at 5000 RPM or less. Also you are running a 
12A so we may need more water flow with a 13B. I don't think Tracy has changed 
his e-shaft pulley and I also think he has not had alternator problems.

Paul Lamar
 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org