Paul,
Other than Tracy's PSRU what options do I have?? Do you have a preference and why??
At this stage interested in a muffler, but will confirm.

Neil Unger.

Not many options for PSRU's.

I was in a motorcycle shop buying parts for our Ninja motorcycle
and I noticed the forged aluminum rear cog belt sprocket on a lot
of V twin Harley motor cycle copies. That may make a good part
for a belt reduction drive. You might need two side by side.
Ken Welter uses a 3:1 belt reduction drive on his Coot.

Paul Lamar


As far as PSRU's go for Cog belt, I think the northwest aero pulleys were and are the
best. Light weight, anodized and built for really high horspower. I have two sets I
cannot use, ( I am doing a vebelt drive for reasons of vibration damping). If your are
interested I can supply pix, data. They are 2.17 to 1, which may not work for you, and
they are built for 400 horsepower, but they can be cut down very easily. They use gates
belts.

On another note , Paul are you against gear drives since you mention harley clone belt
drives on motorcycles ?

Lionel

No but Neil is in Australia which might make one of Tracy's drives very expensive.
The belt drive is an alternative. I prefer gear drives. The draw back to
belt drives is they are rather bulky in the 3:1 range. A very large
pulley is required.

Paul Lamar


Don't I know it! My driven pulleys are 21.25 inches to be
driven by 7.37 inches for a drive to handle 180 horsepower using 5-5vx belts !
Lionel

Ken Welter puts 300 HP through this drive to get out of the water.

Paul Lamar
                   

Thank You so much for posting those Ken Welter pictures,  Yeah thos are my origianl pulleys, still in their origianl wrappings. I can't use thembecause of vibration issues ( Not with tthe Rotary of course, but with isolation from the mount- it's complicated I can explain with a video if you want.)  I am using V- belts for a multitude of reasons, and they are great, but the gates polychain belts are nice. I jsut can't tension with ans eccentric bushing in my case.


How has his realiabilty been ?  the drive certainly looks robust.

thanks

Lionel

Must be pretty good as Ken has been flying it for at least
ten years.

Paul Lamar