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When i put my race fairings on, id like to leave the ram air ducts off.

How much difference do they really make? When you guys do dyno runs, its not like you are hooking up air tubes to the ducts to simulate road speed air. On the track i only get up to around 200kmph. Can that sort of wind speed make any noticeable difference.
 

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Some quick calcs suggest that the ducts are worth .5, 2, 4.7, and 8.4 HP at 50, 100, 150, and 200 MPH, assuming that the motor properly makes use of the extra air.
 

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I seal all the ducts with duct tape so there is no leak, also heat shield the airbox....
here is hot and makes a noticeable diference in trafic in hot days....
 

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We've tried running the bikes on the dyno with fairing/air ducts and without. There is a clear difference as Chip has pointed out.
learn something new everyday.

Ive seen some stunters that pull theirs off and cover the wholes with a fine mesh so that they can see over the 12 o'clocks
 

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Lean
let me explain correctly.... I seal where the ducts conect with chassis and where the airbox conects with chassis with duct tape.

hope that explains your question...
 

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How did you calc that?
Assuming that the inlets are efficiently located and properly sized, the ram air pressure is ½ rho V² where rho is the air density. I then assume that horsepower is proportional to the inlet air pressure.
 

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so a calculator?
You're close but actually a computer. I have a unit conversion program that cuts through almost all of the drudgery associated with the calc.
 

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