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


 I have 1000 hrs on the cog belt drive, I use the htd belt as you
run the belt with some slack in it and it acts as a damper as the
belt wants to run in a circle and the pulleys make it run in an oval
and the bulge in the slack creates a dampening effect, with the
polychain you have to run it tight so you would have to have a damper
in the system, another drawback to the polychain is the very high
cost as I like to replace the belt every 100 hrs just to give me that
warm fuzzy feeling, the cost for an htd belt is $100 and a polychain
is like 1200 bucks.
Ken