The m90 6-rib pulleys are easily available in a range of 2.4" to 3.8" for every 0.1".
If I have a 4.8" pulley on the crank and 3.8" on the blower that will give a 1.26:1 overdrive on the blower, which works out to 6.65 PSI (with 2555cc engine capacity)
And with a 2.4" on the blower (which can be stepped up to gradually) will be 2:1, which I worked out to be around 18.98 PSI
(min 12.5, max 28 PSI when the same setup is used on a 2L)
The standard item I pulled off my engine had 1 small V-pulley, and 2 large, the one nearest the front of the car being air con.. and who needs that
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
So I redesigned it so that the air con pulley is replaced by a 4.8" 6-rib PolyV
The measurements I used to make the 6-rib pulley I got from intense googling and it matches the pulley found on a truck, not the ford/gm supercharger version
So I'm doubting its accuracy.
I do have my original 3.275" that came with the blower but with only a pair of cheap verniers to measure with I'd rather factory specs to model from before any CNC-ing is done.
If anyone knows where to find them it would be much appreciated
The images are big in size but wont affect anyones downloads... they're highly compressed
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![Image](http://i28.photobucket.com/albums/c232/DCypher_03/Frontiam.jpg)
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Chris
![nerd 8-)](./images/smilies/msn_nerd.gif)