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Classifieds (Please No Dealers) => Wanted to buy => Topic started by: hotrod316 on August 06, 2019, 12:17:23 PM

Title: 8mm pullies
Post by: hotrod316 on August 06, 2019, 12:17:23 PM
looking for some 8 mm pullies  42 and a 60 something close to  25% under drive thanks
Title: Re: 8mm pullies
Post by: Paul New on August 06, 2019, 05:32:54 PM
I do not have any for sale but a 42 top and a 60 bottom is 42% OD I may misunderstand your question though
Title: Re: 8mm pullies
Post by: hotrod316 on August 07, 2019, 06:05:09 AM
UNDERDRIVE  -25%  BIG ONE ON TOP,  LITTLE ONE ON THE BOTTON I THINK
ONLY WANT 2 MORE  LBS   
Title: Re: 8mm pullies
Post by: Paul New on August 07, 2019, 11:47:29 AM
Ok 55 on top and a 44 on bottom gives you 25%UD or tons of other ways to get there. But I know most of the manufactured belt guards won’t fit a 60 tooth pulley on the top
Title: Re: 8mm pullies
Post by: gregm784 on August 08, 2019, 01:43:04 PM
... But I know most of the manufactured belt guards won’t fit a 60 tooth pulley on the top

I can get a 58 on top, but unless the belt is SUPER tight, it'll candy stripe the back of it.

On a SBC with a RCD crank support, you can run down to a 53, but you have to relieve the I.D. of the lower pulley a tad bit. 
Title: Re: 8mm pullies
Post by: dreracecar on August 19, 2019, 05:37:39 PM
OD% (or Under) only equates to how soon the blower reaches full boost before it starts to cavitate.   5 over made the same boost as did the 18 over, but was a rocketship at the hit with the 18%