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Old 06-24-2012, 07:09 PM
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Roots Blower

I really enjoy the reading on the web forum here. Sounds like a lot of you guys know whats going on with hot rods! I have a question about how to figure out what size roots blower I would need for a sbf 420ci motor. Any help would be great. I am just trying to get my ducks in a roll before I jump in too deep. This motor will be used for street strip use but more strip than anything. Also looking to put an EFI system on it, and will need help with that too.

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Old 06-24-2012, 08:01 PM
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First decide how much power you want to make. Will you need hood clearance? What other mods are you making or are willing to make to the motor to accommodate forced induction? Which brings you back to how much power. What car is this going in? The more info you provide, the better.
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Old 06-24-2012, 08:14 PM
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I am looking at an 8-71 blower set up. I donít know how much horse power it will take to turn that size blower to make power. I would like to make as much horse power as possible! The car will be a fox body mustang with a power glide trans. It will be a low compression engine to handle the boost .
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Old 06-24-2012, 08:27 PM
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My Nova has a full roller 8-71 383 I run mostly on the street, solid Lunati with Isky RedZone lifters, no problems, see my journal. I'm running two BG 750 BC's, straight linkage with an MSD BTM. You'll make enough power to not worry about how much it takes to run the blower, trust me. Pushing 12 #'s with 8.2 c.r. it's all you can do to hang on to it.

This is in a 4-link back half car, FAB-9 4:10's, 3200 stall TCI and an Extreme Automatics spragless T-400, safe-neutral with a Griner VB and brake. I also run an AIS methanol injection system, just good insurance.

You'll want lots of initial timing, around 18*, 34 to 36 total, all in by about 3k.
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Old 06-24-2012, 09:15 PM
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The nova is a really nice car, I can tell you spend a lot of time and money on it !!! I am going to go with the stock suspension ( mini tub). Hoping it will hook!! My father-in-law has a 89 fox we have been racing for the past couple of years that has a 514 in it and it has been mini tubbed and hooks good on radials.
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Old 06-24-2012, 09:20 PM
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Thanks. The 514 makes a ton of torque, so you should be well versed on what you'll need to hold an 8-71 motor. I'm not a Ford guy, but I've seen some awesome Fox body launches, sounds like fun!
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Old 06-24-2012, 09:26 PM
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We took it to the track last night to do some testing. We are hoping to put the spray on it soon! Still cannot leave real hard (3800 on the brake) the tires will not hold it.
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Old 06-25-2012, 04:43 AM
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Recently I have joined the supercharger ranks. Starting with a 144 style just to get in the game. I have been told that eaton styles make more power with a screw impeller design. My 144 has a roots flat revolving/interlocking dual 8's with teflon strip edge style, that is supposedly out dated. The eatons have no teflon strips to wear out and last for much longer periods of time. The screw impeller designs have been improving in the past years. Something about aidebiatic efficiency, big fancy word.

I am new to supercharging, but found these types easy to rebuild. I knocked in all new bearings and rebuilt the thing in a few hours one night. Even with the new build kit the 144 used was well under a grand complete.

The teflon strips need to be pressed and machined for clearance if you go that way. Dont know if 6-71s have these strips. Supposedly you do not even really need them. Many have chosen to remove them and make proper boost without them. Jerry Dyer , shop owner , informed me of many people who claim the teflon strips are necessary, but are NOT.

The word is they add about 120-140 hp at 5-7 psi and require less timing for max power. In my neighboorhood there is a chevelle with a 142? roots blower and it has the 6 rib belt. It is relatively quiet and fits under the stock cowl hood. The 6-71 has a gilmer belt which is noisy. If you care about that sort of thing. He runs a AVS 800cfm with a silver step up spring.

Dont know if any of this helps. Good luck.
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Old 06-25-2012, 04:27 PM
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Any information is helpful!!! I was going to use a 460 bbf for my build (BIG BLOCK BIG POWER) but a few people told me I should go with a small block. Because of the big weight difference!!
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