2545 ingersoll rand air Compressor Q..

[Spyider]

ok i got this huge compressor a while ago for 50$.. lol yes that is that i paid for it so ya i couldn't pass that up... knowing it was a 3 ph motor when i got it is the only reason i paid what i did.. anyways i want to get it up and running now that i have my 100a subpannel out to the garage all done!

So i need to get a new single phase motor.. but my Q is this.
on the existing ingersoll rand motor is says (HP 10.0/7.50) so does this mean i can put ithor size motor on this unit? because clearly a 7.5 hp one is cheaper than a 10 hp.. and will draw less amps so less light flicker on kick in..

If i do a 7.5 hp do i need to reduce the pulley size or would it be fine since the motor on their seems like its saying ithor size will work..?

Existing motor specs.
PH3
Frame - 213 / 5T
HP - 10/7.5
RPM - 1755/1470
Hz - 60/50
Duty cont

hope that helps..

 

[Dagny]

you need 10 if you run it at 1755 and 7.5 if you run it at 1470 rpm.

 

[Spyider]

so would the only difference be slower cfm basically?... would i need to get a smaller pulley then if i went 7.5 hp..? how would i know what size to get AND would it still be cheaper to get a 7.5 hp + smaller pulley?..