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Originally Posted by pocus
What was the math equation to figure out blower rpms again?
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You have to figure out the perimeter of both pulleys first.
The equation 2 x Pi x R gives you the perimeter. So for a 5.7" diameter pulley you would input: 2 x 3.14 x 2.85 = 17.90"
The pulley turns at the same speed as the engine so at 7000 RPM the 5.7" pulley moves 125300 inches of belt per minute. Thats 10441 feet of belt per minute. Just shy of 2 miles.....pretty fast huh?
Using a 2.62" blower pulley you plug in the numbers again and come up with a pulley perimeter of 8.23" Now taking the 125300 inches per minute belt speed and dividing by the pulley perimeter of 8.23" you get 15225 RPM blower pulley speed at 7000 rpm engine speed. Now just multiply the blower pulley speed by whatever the gear ratio of the blower is (if any).
Of course you can also just divide the engine pulley perimeter by the blower pulley perimeter and then multiply by engine RPM.
That being said, anyone know what the stock SVTF pulley diameter is?