what blower pulleys

building a 540bbc with 12-71 littlerfield blower/enderle big&ugly hat/brodex heads[heads are stock out of box but going to have them flowed and ported to match my engine]/746 lift cam/11.5 - 1 comp..110 enderle fuel pump..i'm wanting to start out easy on engine to get the feel of it and learn the tuneing before i jump in there with major boost..like to see a solid 1100hp to1300hp if possible..first blown alky engine. can i get this hp. with my combo and what OD% ON BLOWER and what pulleys will i need?i have one 8mm pulley now with 46 tooth if i could use it would be good.if not can always sell it to buy the one i need.

 

Well going by first blower motor, you dont need much boost to get to your 1100-1300 hp goal, and with that 12-71 its not going to need much OD. I turn my 8-71 28% over and it makes more than 1300hp.

 

what top and bottom pulley do you have?

 

20% should get you there i had a similar motor i spun 47 over knowing what i know 20% will a good place to start and someone just posted the formula for the 8mm pulleys on this site

 

I use a 73t on the crank and a 57t on top, they are big but I wanted to use the longer 1600mm belt.

 

forgot to state that i have a new belt already also[htd 1440-8m]..would like to use it if i can..also using a dart tall deck block[10.20]std cam location

 

Start with a 49 on top 60 on the bottom will get you there in no time and make it live. Good combo makes 1300 all day at 7500.

 

Here ya's go again!
Jason.

http://www.rcdengineering.com/chart_8nav.html

 

i looked at the blower pulley chart..i see where these pulleys you told me to use and the 46t pulley i have now with a 56t pulley on bottom would give me about same OD% .PLEASE EXPLAIN WHY AND WHAT ADVANAGES do using different combos give me when they both give same OD%?this blower stuff is all new to me.i want to understand everything first before i start playing.
i have a new HTD-1440-8M BELT ALREADY SO WOULD LIKE TO BE ABLE TO STILL USE IT IF I CAN

 

blower pully set up

When I first got started this same issue kicked my butt and I finaly went to RCD's web site and down loaded there 8mm pully chart, then I went over to there belt chart and down loaded it also, a good way to start is to get the center to center from the crank to the blower drive shaft, to see if what you have will work for your set up. just my 2 cents
good luck

Butch