Originally Posted by Rambocj7 (Post 4425357)

Some interesting opinions! I'm sure the motor can spin up to 6k, but anything ive heard is "under five, Stay alive". I want these to last.
Sooo, I have 72lbs injectors and this was based on recommendations of the tuning software using 775hp as the brake hp. BUT I've had a lean issue lately (just redid the heads after I burnt some valves). Trying to find out if it's the injectors or the tune.
It seems most ppl think that I have enough injector.

Originally Posted by Rambocj7 (Post 4425357)

Some interesting opinions! I'm sure the motor can spin up to 6k, but anything ive heard is "under five, Stay alive". I want these to last.
Sooo, I have 72lbs injectors and this was based on recommendations of the tuning software using 775hp as the brake hp. BUT I've had a lean issue lately (just redid the heads after I burnt some valves). Trying to find out if it's the injectors or the tune.
It seems most ppl think that I have enough injector.

Originally Posted by Rambocj7 (Post 4425357)

Some interesting opinions! I'm sure the motor can spin up to 6k, but anything ive heard is "under five, Stay alive". I want these to last.
Sooo, I have 72lbs injectors and this was based on recommendations of the tuning software using 775hp as the brake hp. BUT I've had a lean issue lately (just redid the heads after I burnt some valves). Trying to find out if it's the injectors or the tune.
It seems most ppl think that I have enough injector.

Originally Posted by GPM (Post 4425568)

How much power do you think it takes to spin the blower

Originally Posted by getrdunn (Post 4425575)

More than most people would probably assume or think about much. Many factors/physics involved including efficiency, cfm, boost, altitude etc. Go to kennebell.net and you'll. Each application will vary.

Originally Posted by GPM (Post 4425568)

How much power do you think it takes to spin the blower

Originally Posted by articfriends (Post 4380909)

In my example though a old school roots supercharger uses signifigantly more hp to turn, I recently "dynoed" a procharger at less than 75 hp parasitic loss to make 14 psi of static boost at 5800 engine rpms, hence the reason why you can drive a centrifugal with a 8 or 12 rib serpentine and old school roots blowers need a much larger drive belt, they would shred/slip a 8 rib unmercifully. There are DEFINATELY other issues with pumping losses between rotors, heat generated if sized small and turned up high too on roots but overall the main reason bsfcs are so much higher on it takes more hp to physically turn the roots, fwiw, Smitty