50cczip racer
Well-Known Member
i was going to post this in the clutch topic but feel its worthy of its own thread
ive had interesting results from playing around with shimming the variator,using or removing shims from the centre bush to space out the variator for better acceleration or top speed and more importantly taking up wear and production tolerances from belt to belt.when a thin shim is added the belt seems to sit lower in the front pulley allowing better acceleration but add just a little too much and the belt spins, removing shims or machining 0.5 mm off the bush can provide extra top speed which can be seen on the variator pulleys if you mark them with black marker pen youll see the belt rides higher using the pulleys full range. Hebo document this process in there crank assembly instructions and supply 2 shims ? do any other manufacturers state any set up info
ive seen as much as 2 bhp lost on my belts that have been used for only 1 and a half hours this could be adjusted back with shimming and roller changes but i feel that once the belts get to this stage for racing use its best to start again with a new belt and return to your original settings,i found this out after regular dyno testing before and after races and after refitting a new belt got my original power back after the belt had been run in.
has anyone found better results from polini or malossi overrange belts ive never tried the polini belts as yet but heard they are better than malossi
sprinters and racers please share your experiences.
ive had interesting results from playing around with shimming the variator,using or removing shims from the centre bush to space out the variator for better acceleration or top speed and more importantly taking up wear and production tolerances from belt to belt.when a thin shim is added the belt seems to sit lower in the front pulley allowing better acceleration but add just a little too much and the belt spins, removing shims or machining 0.5 mm off the bush can provide extra top speed which can be seen on the variator pulleys if you mark them with black marker pen youll see the belt rides higher using the pulleys full range. Hebo document this process in there crank assembly instructions and supply 2 shims ? do any other manufacturers state any set up info
ive seen as much as 2 bhp lost on my belts that have been used for only 1 and a half hours this could be adjusted back with shimming and roller changes but i feel that once the belts get to this stage for racing use its best to start again with a new belt and return to your original settings,i found this out after regular dyno testing before and after races and after refitting a new belt got my original power back after the belt had been run in.
has anyone found better results from polini or malossi overrange belts ive never tried the polini belts as yet but heard they are better than malossi
sprinters and racers please share your experiences.