Need Advice On Blower Pullies & Belt Size

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08-09-2015 | 09:49 PM

#21

articfriends

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Joined: Jun 2004

Posts: 7,317

Likes: 1,037

From: frankenmuth michigan

Quote:

Originally Posted by 260Velocity

Well if this makes 625 NA than 1/2 of atmoshere is Appox 7 lbs. so take 1/2 of 625 (312) and add 625 + 312= 937 at 7 LBS. you dont need much boost it looks like to get your goal.

Those heads flow real good, looks like 380 int and 296 ex @ .600 lift.

Correct me if im wrong but that is what BDS has told me in the past.

When you do that math you also have to deduct the parasitic loss of turning the blower, keep that in mid. Roots type blowers use a considerable amount of hp to turn so he would prob end up around 850. Bsfcs around .600 to .650 give or take are common w roots blowers which agains points to the extra hp used to make thar boost, smitty

08-09-2015 | 11:20 PM

#22

mike tkach

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Joined: Oct 2007

Posts: 8,439

Likes: 93

From: yorkville,il

sam,get me the measurement from center of crank to center of blower drive and i will tell u what belt&pulley,s to start with.if your engine is tuned properly i see no need to mix fuels,that is what a lot of guys do when they don,t have the correct tune,kind of a bandaid.