Underdrive pullies

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Dec 22, 2006 | 04:13 PM

#11

69mach1377

5th Gear Member

Joined: Aug 2004

Posts: 2,593

From: ABQ, NM, USA

RE: Underdrive pullies

And that may free up a little power also. It will reduce the speed of the driven components, a good thing for a higher revving setup (gears, etc.).

Dec 22, 2006 | 05:53 PM

#12

65mojoe

4th Gear Member

Joined: Jun 2006

Posts: 1,142

From: Nor*Cal

RE: Underdrive pullies

march FTW, I don't think there are many other brands that match it...maybe steeda but I don't think they make any sets for the classic stangs.

Dec 22, 2006 | 10:46 PM

#13

Clu7ch

5th Gear Member

Joined: Mar 2006

Posts: 2,328

From: Where I lay my head is home

RE: Underdrive pullies

Quote:

ORIGINAL: Colorado_Mustang

It simply means the pulleys will reduce the RPM of the components when compared to the factory pulleys.

Pulleys are pretty simple to determine RPM. If you have a 6 inch crank pulley and a 3 inch alternator pulley, the alternator will turn 2x the crank speed. If you drop the crank to 5 inches, the alternator will turn 1.67x the crank speed, or about 17% underdrive.

Quote:

ORIGINAL: Clu7ch

EDIT: What defines an "Underdrive" pullie?

Cool. Thanks guys!