Originally Posted by LordTTK
Hi and thanks for all the input.
I have this cam Crane #113801 HMV278-2
And i use the stock pulleys that came with the blower.
And i use a piston style 170 gph fuel pump.
Heres the pulleys thats on the blower
Crank pulley is 6 inch
Upper is 3.07 inch
These pulleys = a 1.95:1 drive ratio. A good place to start.
Once your carb jetting/spark timing is dialed in correctly, you can step up the blower boost a bit to maximise power. (may require more spark retard or higher octane fuel)
A 2.38:1 pulley ratio is about tops for these blowers. (blower air discharge temp and belt slip/belt life gets excessive beyond this point)