Ive got my buddy`s vortec superchager im trying to use as a mock up. For my superchager setup. we were trying to find the best way to drive it. we came up with driveing it off the cam that drives the waterpump. I need to know what kind of stress the cam will handle? and what the ratio is for what rpm the cam spins relative to the engine rpm? I figure if this goes together like we are hopeing i may beable to do this for about $2000 maybe less including a PCS X-F-C. Im looking for about 5-6psi wich should get about 400 to 500hp. maybe alittle more with a port and polish.

Not a good idea for 2 reasons -

1) The cam is driven at 1/2 the engine rpm. The supercharger needs to be run at twice the engine rpm (roughly). This means you'll have to have a large pulley to make up the difference. The smallest supercharger pulley is maybe about 2", so instead of a 4" drive pulley, you would need an 8" drive pulley.

2) It requires maybe 30-40hp to drive the supercharger. At 3000rpm (roughly the maximum cam rotation at redline), that means it's going to be drawing 70 ft-lb of torque through the cam. Not only through the cam, but through the cam chains. This will put a lot of added strain on the tensioners chain, guides, etc. It may not last 100 miles.

Either you need to mount it in front, or you need to build a driveshaft for it to cross the engine.

Not a good idea for 2 reasons -

1) The cam is driven at 1/2 the engine rpm. The supercharger needs to be run at twice the engine rpm (roughly). This means you'll have to have a large pulley to make up the difference. The smallest supercharger pulley is maybe about 2", so instead of a 4" drive pulley, you would need an 8" drive pulley.

2) It requires maybe 30-40hp to drive the supercharger. At 3000rpm (roughly the maximum cam rotation at redline), that means it's going to be drawing 70 ft-lb of torque through the cam. Not only through the cam, but through the cam chains. This will put a lot of added strain on the tensioners chain, guides, etc. It may not last 100 miles.

Either you need to mount it in front, or you need to build a driveshaft for it to cross the engine.

the drive shaft was my first thought. thanks for clearing all that up. I knew the supercharger needs to spin that fast. thanks.

That's what these guys did:

http://www.angelfire.com/stars/mycaddy/northstarsuperchargerphotos.htm

That's what these guys did:

http://www.angelfire.com/stars/mycaddy/northstarsuperchargerphotos.htm

yep im gonna do somthing relative to that. thats what gave me the idea. i figure i can get about with a unit from ebay for about $200. this guy who im using his unit for a mock up is probably gonna get me all the stuff that is nesary to do this. he will also heko me get the piggy back hooked up.

That's the system XMS Racing was developing a few years back that never really produced any results. It looked to be a relatively sound design though.