Thread: Cog belt and pulleys, any good?

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If you want an opinion, these have problems. If the axis all three pulleys are not parallel, the belt will walk. The pulleys do not have guide flanges (from the picture) so the belt can walk right off the pulley. There should be a flange on one of the pulleys for the front side and one flange on the back side. The flanges dont have to be on the same pulley.

Also, the tensioning will be critical to prevent belt vibration.

Like the other guys said, a serpentine is more reliable and drives the accessories better....make sure you get the correct rotation fan and water pump.

mike in tucson

Certainly has a cool factor to it. True everything needs to be lined up properly to track right, but it does have the flange on the smaller pulley to keep the belt from walking. Price is right. If it's what you want, do it. Build your car for you, and have a ball. These belts run best when all the free play is eliminated, without being pulled overly tight. They just don't need it, the drive relies on the tooth and cog to drive everything and not friction, like a v belt or serpentine requires. I used the same style system to drive the prop on a homebuilt airplane, constant load at 4000 RPM at cruise speed, for hours at a time. Worked great.