Hey guy's just saw this on weiands websit it says it is for Vortec heads, but the bolt patterns are the same for LT1 and Vortecs so would this be a start for the LT1?? I was thinking a 4bbl TB or a elbow and 90mm TB with injectors mounted below the blower, Also does any one have deminsions on the I looked and could find any. Any input is appreciated.

http://www.holley.com/products.asp?product=6542-1

 

Thats what I want to know!!

 

There's really nothing stopping you from putting a roots blower on an LT1 right NOW. Well, nothing a competent machine shop couldn't fix.

I think your real problem is installing it in your car.

Clearance issues and all that...

 

I don't think the Vortec intake bolt pattern is the same as LT1. If you have information stating otherwise, please share. That's always been an issue with people converting to single plane intakes since none with injector bosses bolt up to LT1 heads, but they do make them for Vortec heads.

The Weiand 142 is actually a pretty crappy blower. Efficiency is around 40% and the hp limit is around 500 fwhp.

Also, the lower intake manifold is very low profile and I doubt you could fit injectors there. I've seen a mustang with a small roots blower, but they put all 8 injectors abover the blower.

 

Vortec intake bolts go in straight up and down and are around 1/4" or so, might even be metric (been a while since I've done one). No way it's gonna bolt right onto a LT1 but anything is possible with some time and money.

James

 

Roots style blowers are inferior to centrifugals anyway, top fuel is about the only place they have a niche anymore. They have a higher AIT than just about any compressor design out there.

 

Is there really that many people wanting roots blower?

I got it to where I can build 1/2 of my kit in about 30 minutes.. I"m just waiting on a good solution for the other 1/2

A machine shop local to me is interested in picking up the other half.. how much are you guys willing to pay for a kit minus blower/injectors

 

I think Alvin is referring to an Eaton M112, which is somewhat more efficient than the Weiand 142, though not as efficient as centrifugals.

 

Screw hood clearance I have big saw. I want a 671 pokin out.

 

Well, if you have a big saw for the cowl and a fabricator to help you sort out the issues regarding the bolt alignment and injectors; then there's really nothing stopping you.

As some folks have pointed out, the roots isn't all that efficient. You can sort of crutch that by buying a bigger blower and changing the pully to maintain the same boost levels as the smaller blower; but you're still better off with a screw type blower.

Centrifugals are much more efficient of course, but then again; they have a different "boost curve".

 

We have been down this road before, roots suck. I converted my best friend (norb) over when he built up his big block. His friend john dynoed a 468 with 12psi from an 8-71. It made a whopping 460rwhp on a mustand dyno. My friend went with a vortech YSi and on his first dyno with 6psi he made 485rwhp. We later found out that the rings were installed wrong and the 496 had 25% leakdown. So we are awaiting another dyno. I expect him to dyno over 515, beating the roots by 10% with 50% less boost.

Dislaimer for the newbies, these dyno numbers are on a mustang dyno which reads lower than dynojet and the cars have TH400's with 3000-4000 stall converters and 38 spline or higher axles (heavy) in ford 9 inch rears. BTW Norbs torque was 500-630ftlbs.

 

Would be nice to start seeing more positive displacement superchargers coming out for the f-bodies. Having to do custom work kills the idea for most people.

I'd love to see the twin screws get used on the LT1s. There's a few 03/04 cobras running the KB 2.4L and making over 700rwhp/rwtq at ~25psi. The KB 2.4L is rated to 1005cfm and 28psi. The sick thing about it is those same engines were making right at 700rwtq at only 2300rpm and was flat as a table to around 5000rpm before falling off slowly to redline. They didn't have to rev the engines over 6500rpm neither to get that power.
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There's been some talk about people starting to experiment with the twin-screw marine blowers (made for big blocks) in streetable small blocks.... 3.3L twin-screws pumping out close to 1400cfm. Can you say hello 1000-1100rwhp/rwtq (possibly more) and a brutally flat torque curve?

IMO, twin-screw blowers are the future of forced induction street builds. Awsome power and efficiency, near "perfect" torque curve, and packaging is fairly light and small. Just need some very good tires

 

i dont have any problems with twin screws.

 

The eaton is alot more effiecent than old roots.

At almost the same pressure my eaton did 380ish 455 tq and my aftercooled t trim did 480 at 455 tq.

The eaton had no cooler on it at all, the vortech has a air/water.

To be honest I was dissapointed when I put my vortech on.. the eaton felt way better.

 

The eaton felt better with 100 rwhp less?!?!