G
gman086
Well-known member
It is one angle per sheave but they are different on each side so... two different angles = belt slip and clutch heat is what I was trying to convey.
Have FUN!
G MAN
Clutches are back from Indy Dan
- Thread starter lennstang
- Start date
It is one angle per sheave but they are different on each side so... two different angles = belt slip and clutch heat is what I was trying to convey.
Have FUN!
G MAN
I don't get it. Why do they build it like that then?
X2.
P
phatboyfilms
Well-known member
x3 
Putting a flat edge on the face on the sheave, it appears to be one angle unless I'm missing something. Regardless, I'm looking forward to Dan's setup.
Pic of one side of the sheave.
This other pic is showing the difference in symmetry.
Flip your straight edge so it goes all the way from the bottom to the top and you will see what I'm talking about. The Cat clutches I have don't have this angle transition 3/4" up the face.
G
gman086
Well-known member
I was told it's better for smoother engagement and operation for the weekend snowmobiler but for the mtn rider, operating mainly near full shiftout, it becomes a big problem. Maybe Indy Dan or Carl's can chime in.
Have FUN!
G MAN
I dont know why they do this, but its obviously intentional. My first thought is to compensate for the play in the bushings. Under load the movable sheave is going to be pulled "back" by the belt pressure, which would then put the forward side of the movable sheave angle much closer to that of the stationary sheave WHEN UNDER LOAD. Of course the amount of slop and compression of the bushings is a factor, but there will always be some slop even on new bushings.
A high speed camera would be fun to see what actually happens under a load.
A high speed camera would be fun to see what actually happens under a load.
Years ago when I was much less sensible than now 
I rode with my hood and clutch cover off. What I saw when on and off the throttle in bumps and varying tracktion situations was chaos. The belt jumpuning up and down on both clutches ( button secondary ). Would be intresting to put a camera down there view them working safely.
I rode with my hood and clutch cover off. What I saw when on and off the throttle in bumps and varying tracktion situations was chaos. The belt jumpuning up and down on both clutches ( button secondary ). Would be intresting to put a camera down there view them working safely.