Well, I haven't had it machined yet (still waiting for quotes to come back) but did this: used a stock TPI serp crank pulley, procharger alum spacer and 8" procharger crank pulley. Put the assembly together as it would be on an engine and started measuring and designing in UG (very sweet CAD package) at work in my free time. I'm currently working on a FEA to determine the strength of the unit in either steel or aircraft grade aluminum. Here are some renderings of what it would look like.

 

A couple more

 

Final image

 

very nice! I'd be curious about what it would cost to have made up?

 

Looks pretty good!!! Think you could get a quote with a extra 4 ribs added onto that design

 

Looks cool… but steel and aluminum would have different design constraints.

I’ve actually gotten away with using existing steel pulleys and welding them together with spacers/plates that fit in between things… it worked out much better then I expected as long as I figured out some way to fixture it like I wanted it.

 

Is this a common problem with ATI's kit? WTF, for that much money?

 

I don't think the pulley design is better than say the Vortech which is a pulley that inserts into the stock one. ATI's is a 3 piece, stock crank pulley, alum spacer than the blower crank pulley. Trying to align (3) objects rotation axis can be d*mn near impossible sometimes. I battled with it for better part of 2 months. Now I've designed a one piece unit.

 

Vortech uses two stock pullys and a spacer. Sounds like its identical to the ATI setup, except.. I've never had aproblem with it..

-- Joe