Thread: Turning the pulley
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Old 06-12-2015, 10:18 PM
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onehundred80
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Default Re: Turning the pulley
Originally Posted by Sweet2002
I have a PM out to grip grip but if anyone else knows this would the grooves have to be cut when taking off 4mm's? my measurements show the 74mm is the overall, grooves are at lea st 2mm deeper so when we talk 74mm it is the overall so do grooves need to be cut? Thx, Mark
The OEM pulley grooves are about .135 deep and the rib on the belt is about .08 deep with squarish corners at the root.
You could conceivably make a groove say .11 deep with .020 rads in the corners, the width of the groove, included angle and the radii at the top would have to be the same as the OEM pulley. You would gain .050 on the inside diameter of the groove or you could make the outside groove diameter .05 smaller. It would be weaker because of the smaller radii but ....
You do not want to lose the existing belt contact area or it is a step backward.
 
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