Thread: 10-71 Blown 511BBC

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The Racers Math Handbook & Car Craft mag have forumulas to figure boost for Roots Blowers based on Displacement of the Supercharger * % Over/Under Driven*25.58/Engine Displacement -14.7.

Looks like I need a 10-71 as at 1:1 on a 511 it creates 10.2 lbs of boost.

After attending Federated Auto Parts event at Summit I met afew Roots Blower affecionados and it seems a 480-511 Supercharged BBC Engine is a match for a N/A 496-565 CID BBC.

It seems like it would be easy to make 770-900 HP/ w or w/o Intercooler with a 10-71 but could a Tall Deck 427 Truck block take this abuse( Street&Drag)?

you do not need a 1071 build the bottom end with abit more CR it takes power to turn the big blower if just for strip use you can build a engine with a bigger blower but you better be thiniking real good heads.i should be running 10 of boost with my b&M blower on my 548 just never could check boost and hang on at the same time.,the truck block can take 770+ hp with some prep work . even more but gets to a point were a new block looks good .agood lined 871 is all you need

Scroll down to the last chart on this page. Blower Drive Service is producing 10 lbs on a 500 at 1:1 with a Stage 2 8-71.
http://www.blowerdriveservice.com/techcharts.php

with a intercooler and abit more cr you do not need the be at 1to1

Looks like the 427 Tall Deck Truck block will be good enough.

I would like to run a water/air intercooler under the 8-71, but I hear you can lose 1-6 LBs of boost, does the cooler air offset this loss?

Using E-85 as fuel, & a water/air intercooler could I run a higher Static CR ( not the usual 6-8.25:1 CR) like 10.25-11.25:1?

Originally Posted by BottleRocket

Looks like the 427 Tall Deck Truck block will be good enough.

I would like to run a water/air intercooler under the 8-71, but I hear you can lose 1-6 LBs of boost, does the cooler air offset this loss?

Using E-85 as fuel, & a water/air intercooler could I run a higher Static CR ( not the usual 6-8.25:1 CR) like 10.25-11.25:1?

your runing a very low cr and making it up with boost=heat =loss of power the way i have built them is start at 9to1 or abit more and then add boost to that starting at 7to1 is way to low and the 1-6? of boost who cares ?? your loosing moreHP spining the bigger blower you may see cooler intake charge but like i said i ran the smaller blowers on big engines a lined 871 will do the job very good .. so less its all out drag car your looking at a way i never did. i built about 12 or more blower engines and they all worked very good i can give you a ride in a car that makes low boost and runs very good like blows the tires off at 100

Listen to Pat I've hung on many times for dear life in that 50 Chevy and not to much scares me (I"m married)

Originally Posted by street racer

not to much scares me (I"m married)