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Old 10-12-2017, 10:09 AM
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Side draft roots blower?

It’s been a long damn time since I’ve been on a forum but I find myself coming to Hotrodders for questions. Amazing how little info I can find in forum and on net for side draft roots blowers. I really don’t want a Maggie or Procharger. No offense but want to bring back my 80’s roots. Pun intended. Guys, does anyone still make a side draft 6-71 or 8-71? I’m in a new car theme in life. Sold the 36 and poured myself full bore into autox with my 69 Camaro. The first event I attended I was thinking this is just silly but what the hell. Turns out it’s more difficult than it looks. Now many events in, I’m wanting mo powa! And I want something other than the cookie cutter setups.....or I’d just go with a Procharger. No offense intended to anyone first and foremost. Please understand, I must be able to see the corners of my fenders so an updraft system will not work for me. I need to keep my intake charge below the hood. And No to turbos. I’d appreciate any guidance from the guys that have been here done that even if it means I have to find an old school blower and work around it. Been a while but the guys that come to mind is Mike and Martin?

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Old 10-12-2017, 10:17 AM
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CTS event a couple weeks ago
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Old 10-12-2017, 11:25 AM
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I have seen 2 roots blowers setting at 45 degrees from each other mounted on a triangular shaped intake.

I really don't know any reason why you could not mount the blower upside down IF: you ensure the position of the blower does not impede the lubrication process going on in the gear case. on the 45 degree job they used some kind of oil circulation to keep the blower gears and such lubricated and happy.
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Old 10-12-2017, 11:40 AM
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I'm not sure exactly what question you are asking. The traditional Roots blowers have an inlet on one side and an outlet opposite that. That's how they work. There have been manifolds made that bolt to the top and use sidedraft Weber carbs (or equivalent EFI bodies. Aftermarket roots style blowers like the B&M also have that option. Even that will likely stick up through the hood of your Camaro. The factory Eaton blowers with screw-type impellers usually have a inlet at the end opposite the drive and an outlet at the bottom (or top in the case of the Ford supercharged Thunderbird.



If visibility is a big concern, look at a centrifugal blower like a Paxton or Vortech to keep it under the hood.



Of course, there's always a vintage Latham. Saw one of these at Hershey last week.

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Old 10-12-2017, 12:25 PM
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Except for the axial flow Latham I have a hard time visioning a 6-71 or 8-71 not needing a bubble in the hood even with side drafts you need almost as much space for the adapter or duct-work if mounting the carbs or TBI low and to the side. How about port injection with just a throttle body on the side ducted up to the blower inlet?

Bogie
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Old 10-12-2017, 12:50 PM
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True true, but Iím looking at 14Ē at the bottom most part of base on a LS3 with BDS adapter base plate to top of blower regardless of whether itís a 4-71 or 8-71. I just need the intake charge to draw from the sides...not the top like a traditional blower. My LS3 sits very low in the frame and the top of the blower will sit just 1Ē above the stock cowl hood which I can deal with. I canít use the car with a top draw and a buzzard catcher in my face. Ha ha.
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Old 10-12-2017, 12:55 PM
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Much like the first blower Joe posted only in the longer version with much more volume. Back in the 80ís BDS made a side draft but no more.
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Old 10-12-2017, 01:11 PM
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Quote:
Originally Posted by Stovebolter View Post
I just need the intake charge to draw from the sides...not the top like a traditional blower.
Then start looking for a supercharger that ISN'T a Roots-style. You need an axial blower like a modern Eaton or a centrifugal. Again, the positive displacement Roots blowers only have inlet and outlet opposite each other. That's the way they work.
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Old 10-12-2017, 01:11 PM
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Like I mentioned, engine sits low.
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Old 10-12-2017, 01:14 PM
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Ok, Iíll check with Maggie since they do make a 4.0 ltr with cog drive. Guess that may be my only option. Thanks gentlemen.
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Old 10-12-2017, 01:15 PM
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Your other option is to get an Edelbrock axial supercharger for an LS3.

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Old 10-12-2017, 02:23 PM
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You might be able to get away with one of the Weiand B&M Style blower. They aren't quite as tall.
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Old 10-12-2017, 02:34 PM
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The added weight will tighten the front end you'll need to do some work to get it balanced again.
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Old 10-12-2017, 05:25 PM
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Have you looked into a Potvin drive set-up?? I don't know if they make one for an LS engine though.
Radiator and grill/bumper might need modification tho'
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Old 10-13-2017, 07:17 AM
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Quote:
Originally Posted by ericnova72 View Post
Have you looked into a Potvin drive set-up?? I don't know if they make one for an LS engine though.
Radiator and grill/bumper might need modification tho'
Yeah. That'll bolt right into that Camaro. Cheap, too...

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