Vacuum Motor Questions

I got a few vacuum motor questions and i think im in the right place to ask them

1.What would be the maximum CFM a vacuum cleaner motor could move? (This is with an open motor meaning that its no longer a vacuum cleaner but just the motor so theres nothing to slow the airflow down)

2.If you used a suction cup(like they do on those stupid vacuum cleaner commercial to pick up a bowling ball) What would be the maximum weight a vacuum motor could lift?

3.I have mounted 6 vacuum motors to a wooden box so all the motors will suck air out of the box. With each motor thats turned on would the sucking power be doubled?

4. If all 6 motors were on what would the max CFM and max weight it could lift be?

If anyone needs pics to see what im talking about just ask!!

 

Can noone help me out here??