Lowering IAT with a roots
#3133564
03/30/23 09:11 AM
03/30/23 09:11 AM
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Joined: Dec 2007
Posts: 12,593 Great Neck,LI,new york
hemi-itis
OP
I Live Here
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OP
I Live Here
Joined: Dec 2007
Posts: 12,593
Great Neck,LI,new york
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I have hit a roadblock at an IAT of 160* with my roots blower @8 lbs of boost. Any more boost and the ET starts dropping off and the IAT goes up. From what I've read W/M injection will lower the IAT by 50 to 60 *.I would like more than that as 10 lbs of boost is 220*. I would like some opinions on using nitrous to cool the charge as it come out of the bottle at -130 *.I have installed the extra long injectors into the spacer plate, one in each spacer plate pointing right into the blower rotor. Has anyone tried using NOS to intercool and how much of a drop could I expect with NOS?
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Lowering IAT with a roots
[Re: hemi-itis]
#3133584
03/30/23 10:40 AM
03/30/23 10:40 AM
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Joined: Mar 2005
Posts: 1,573 Michigan
Kiddart
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,573
Michigan
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I don't know much about roots style blowers, but could you run some type of intercooler like a normal turbo setup or procharger? on the other hand a larger blower might help as well. I am interested on the reply's on this one. On engine masters this last week they did intercooler with turbos, and it did help out a bunch, just thinking this could help you.
Thank you Kiddart
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Re: Lowering IAT with a roots
[Re: hemi-itis]
#3133587
03/30/23 10:58 AM
03/30/23 10:58 AM
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Joined: May 2011
Posts: 4,492 northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,492
northern,Ohio,USA
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You may need the blower serviced, Have you had that done lately? Valve springs? There was a test done on yt with NOS and the gain was the same as the NOS kit size. I have hit a roadblock at an IAT of 160* with my roots blower @8 lbs of boost. Any more boost and the ET starts dropping off and the IAT goes up. From what I've read W/M injection will lower the IAT by 50 to 60 *.I would like more than that as 10 lbs of boost is 220*. I would like some opinions on using nitrous to cool the charge as it come out of the bottle at -130 *.I have installed the extra long injectors into the spacer plate, one in each spacer plate pointing right into the blower rotor. Has anyone tried using NOS to intercool and how much of a drop could I expect with NOS?
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Re: Lowering IAT with a roots
[Re: Clanton]
#3133597
03/30/23 11:26 AM
03/30/23 11:26 AM
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Joined: Jan 2003
Posts: 13,493 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,493
Marion, South Carolina [><]
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I've never had a blown combo, but from what I've seen others go through...I'd absolutely go E-85.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Lowering IAT with a roots
[Re: an8sec70cuda]
#3133600
03/30/23 11:45 AM
03/30/23 11:45 AM
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Joined: May 2004
Posts: 12,478 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,478
Taxes & Virus's R-US, NY
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I bought a blower motor off a friend last year. Its a 440/450 8:1 motor that ran an 8-71 on it. He ran as much as 22lbs of boost on it. I don't have it running yet, but he ran it on E85 and loved it. I got the carbs and fuel system with it as well. Just not the blower and intake.
Not sure if I am going to run a roots on it, or go Procharger at this point yet. When I priced a roots, they told me they build to order based on the fuel. M1 uses tightest tolerance and makes the most boost, E85 uses a little more clearance....And gas uses the most clearance and creates the least boost. What is your blower setup for?
I know you drive it.....So I would run gas on the street, and E85 at the track....Which if your running carbs, can be an issue...Which brings us to where you are trying to cool IAT's with carbs on gas....Meth is the way, how to get there I guess there are different kits. Long as you kick it in when it gets up in boost...So a couple of nitrous plates and a pump and meth tank and a boost pressure switch......
I will mention a whipple 8.3L will make a lot less heat on gas.
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Re: Lowering IAT with a roots
[Re: Dragula]
#3133611
03/30/23 12:09 PM
03/30/23 12:09 PM
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Joined: Dec 2007
Posts: 12,593 Great Neck,LI,new york
hemi-itis
OP
I Live Here
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OP
I Live Here
Joined: Dec 2007
Posts: 12,593
Great Neck,LI,new york
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I'm at 545 inches with a stage 3 1071. Have not restriped the blower bacause I'm 90% street. At the track on a hot day the best has been 9.3x @ 138 with 8 lbs. Using 2 SV1 carbs and prefer to stay on gas due to availability of E and would also have to change the entire fuel system. If I could just lower the IAT's it should slide right into the 8's. I figure I will start with a 50 shot under each carb and see what happens. There must be someone that used nitrous to cool the charge with a few hundred HP as a by product.
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Lowering IAT with a roots
[Re: hemi-itis]
#3133627
03/30/23 12:52 PM
03/30/23 12:52 PM
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Joined: Dec 2005
Posts: 12,307 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 12,307
Fulton County, PA
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Not a boost guy, but I've heard of it being done. Turbos as well.
Most drag race stuff limits you to one power adder. Might have been tractor pulling circles where I read about it.
Last edited by CMcAllister; 03/30/23 12:53 PM.
If the results don't match the theory, change the theory.
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Re: Lowering IAT with a roots
[Re: hemi-itis]
#3133640
03/30/23 01:31 PM
03/30/23 01:31 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,219
New York
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Anything combustible (gas, M100, nitrous) in a Roots system is a bomb waiting for that hung exhaust valve, backfire etc. Seen the pix of blowers going 300 feet in the air? Turbos & centrifugals can boost only air with fuel added at the throttle body.
Look at the discharge (lower) port of a Kobelco etc. blower. In place of the rectangular port your blower has (full length & full width of the blower case), the serious versions have a much smaller, almost triangular* port placed at the extreme forward end of the manifold. All Eaton "M" series blowers have this. This mod, alone, reduces IAT.
* Closest shape is a NACA submerged duct
Boffin Emeritus
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Re: Lowering IAT with a roots
[Re: Al_Alguire]
#3133733
03/30/23 08:07 PM
03/30/23 08:07 PM
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Joined: Dec 2007
Posts: 12,593 Great Neck,LI,new york
hemi-itis
OP
I Live Here
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OP
I Live Here
Joined: Dec 2007
Posts: 12,593
Great Neck,LI,new york
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Poly; I know I'm playing in the danger zone and only intend on 50hp or so under each carb. Mike; The strips wear a certain amount and that's it. Restriping is for the hard core racer looking for every ounce of boost. I'm a streeter with 3 or 4 track days if it's in the budget. Andy; I will to a few nitrous companies. I figured I would ask here as there is vast Knowlege here. Al;$1800 is NOT in the budget which is why I used two fogger nozzles for a baby shot.That octopus you pointed out is for a huge amount of juice!
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Lowering IAT with a roots
[Re: hemi-itis]
#3133863
03/31/23 11:22 AM
03/31/23 11:22 AM
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Joined: Jan 2003
Posts: 19,537 Las Vegas
Al_Alguire
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I Live Here
Joined: Jan 2003
Posts: 19,537
Las Vegas
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Been down this road and that "octopus" does a MUCH better job of accomplishing what you are after with great results. It will give you as much or as little as you need, but it distributes that much more evenly and better IMO. We tried plates as well with mixed results. Once we wen that way the street driven 8-71 small block it was on was driven to and from the track and able to run bottom 8's at will and this was in the early 2000's..
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Lowering IAT with a roots
[Re: hemi-itis]
#3133875
03/31/23 12:07 PM
03/31/23 12:07 PM
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Joined: May 2011
Posts: 4,492 northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,492
northern,Ohio,USA
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Poly; Mike; The strips wear a certain amount and that's it. Restriping is for the hard core racer looking for every ounce of boost. I'm a streeter with 3 or 4 track days if it's in the budget. I agree about the strips self clearence and that is it.When I had my blower serviced .009 is what I had the set it at but I also got new bearings so you may want to think about that. That NOS plate sure is nice but all said n done it may be close to 3k with a bottle,solinoid,tax,shipping or very close to that.Good luck figuring out what you want to do I know it aint easy.Be safe!
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