My brain's being lazy this morning. Could I trouble you to show your work, please? (Not doubting, just intrigued)Originally Posted by BigTom73
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11-29-2010
My brain's being lazy this morning. Could I trouble you to show your work, please? (Not doubting, just intrigued)
11-29-2010
Not a problem
If you want the speed of the supercharger all you have to do is multiply the engine speed by the drive ratio. This ratio is equal to the diameter of the harmonic balancer divided by the diameter of the supercharger pulley.
You get that by the following:
In one revolution of the crank the belt moves a distance equal to the circumference of the harmonic balancer. One revolution of the supercharger results from the belt moving a distance equal to the circumference of supercharger pulley. Since circumference is equal to pi times the diameter, the drive ratio can be expressed in terms of the diameter of the harmonic balancer to the diameter of the supercharger drive pulley.
For an engine speed of 6000 rpm with a 3.0" supercharger drive pulley and a harmonic balancer with a diameter of about 7.16" the supercharger speed would be 14,320 rpm.
11-29-2010
"...the redline of the supercharger is 14000, but that doesnt mean you cant spin it to 16000 at your car's redline. Obviously you want to not overwork the supercharger, but the redline is more a consideration for marine applications where the motor is constantly moving at high rpm. In a car, you spend very little time at the redline even when racing. " Found here
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