The KW belts may not regularly break with light street usage, but the cogged design means that they will experience shock when transferring power to the pulleys and when that energy repeats in intense fashion (track abuse) they can only take that shock so many times before giving out.
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Originally Posted by CSG Mike
Here's an analogy. When drag racing, if you bog your engine and the tires hook.... you'll probably break something. But, if you get wheelspin, all that excess energy, instead of being absorbed by the drivetrain (transmission, driveshaft, differential, axles), gets burned up as tire smoke.
No play = something has to take the force when you do a hard shift. Normal belt systems are intentionally designed to momentarily slip to release the energy. With Kraftwerks, the belt has to take all that load, and it can only do it so many times...
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This is why Rotrex doesn't recommend cogged belts/pulleys to drive their superchargers.