Dry blower
#2555454
09/27/18 11:10 AM
09/27/18 11:10 AM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Anybody here ever run a dry( no fuel) roots blower set up? I know most aftermarket blowers have soft strips that contact the case. I would think running a stripped blower without fuel would be detrimental to the strips. Looking at running the fuel into the manifold after the blower. Thinking maybe a fresh Detroit diesel blower without strips would be the way to go in this configuration. Any thoughts???
"use it 'till it breaks, replace as needed"
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Re: Dry blower
[Re: TRENDZ]
#2555526
09/27/18 01:38 PM
09/27/18 01:38 PM
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Joined: Mar 2007
Posts: 3,277 West Coast, USA
jbc426
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Most moderns cars with blowers inject the fuel into the port after the blower don't they? Call one of the blower shops.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Dry blower
[Re: TRENDZ]
#2555811
09/28/18 01:59 AM
09/28/18 01:59 AM
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Joined: Dec 2007
Posts: 12,587 Great Neck,LI,new york
hemi-itis
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I Live Here
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Even with injection into the intake they still put some in the top to help cool the rotors.Might even keep intake air cooler. I still use carbs,,SV1s at that!
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Dry blower
[Re: jbc426]
#2555851
09/28/18 07:49 AM
09/28/18 07:49 AM
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Joined: Nov 2010
Posts: 3,696 jersey
Spaceman Spiff
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Most moderns cars with blowers inject the fuel into the port after the blower don't they? Call one of the blower shops. Those aren’t roots blowers, and have oil lines for cooling.
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Re: Dry blower
[Re: TRENDZ]
#2555921
09/28/18 11:55 AM
09/28/18 11:55 AM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
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The Eaton 2650 is considered a roots, no? The rotors are coated, but no tip seal. Perhaps improved tolerances allow adequate sealing with no physical seal
Last edited by OUTLAWD; 09/28/18 11:56 AM.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Dry blower
[Re: TRENDZ]
#2555942
09/28/18 12:29 PM
09/28/18 12:29 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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No roots. That’s actually a screw compressor.
I’m trying to do something a little goofy here. Some of you may be familiar with the Potvin blower set up. It is a direct link front mount blower drive that was used in the early salt flat and drag cars. The blower mounts in front of the engine, like where the radiator would go. I have an early hemi that I want to do this set up on. Just wondering about blower temp/ life without fuel cooling the blower.
"use it 'till it breaks, replace as needed"
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Re: Dry blower
[Re: TRENDZ]
#2555949
09/28/18 12:52 PM
09/28/18 12:52 PM
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Joined: Dec 2007
Posts: 12,587 Great Neck,LI,new york
hemi-itis
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I Live Here
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I have teflon strips in my roots.I never restripped as I an not a competitor looking for every single HP.Top fuel and alcohol teams restripe after every run or 2.Once they establish their clearance it never changes.
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Dry blower
[Re: TRENDZ]
#2556077
09/28/18 07:34 PM
09/28/18 07:34 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
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AFAIK Teflon can run pretty tight dry. That Eaton model is a Roots, and simply moves air into the manifold. If the engine's normally aspirated intake volume (CFM) is smaller than the blower discharge volume it develops compression in the manifold. If the blower volume is less than the engine's, there will be intake vacuum and no boost at all. How to tell: the left and right rotors are identical, and have continuous cross-section along the entire length. The more complex Sprintex, Autorotor, Kennebell, IHI for Mazda, PSI, Whipple, &c. have asymmetrical rotors with different numbers of lobes (3 & 5, etc.) which change cross sectional area as they approach the discharge port. More information on my site here (look for "twin screw"): http://victorylibrary.com/mopar/blower/blower-choices3.htm
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Re: Dry blower
[Re: TRENDZ]
#2556095
09/28/18 09:11 PM
09/28/18 09:11 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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Ok got on the roots /screw deal. i guess in my mind a high helix roots like the one shown by Outlawd is just moving air as described by Poly. Just because it is being screwed to the rear does not make it a screw compressor. Anyway, I guess I will just call a blower company as suggested, and ask about doing what I want to do here. I have an internal struggle with this. On one hand, seems to me that the blower rotors may need more clearance in this application with no liquid for cooling. On the other hand, I know that more clearance creates heat.
"use it 'till it breaks, replace as needed"
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Re: Dry blower
[Re: don miller]
#2556136
09/28/18 11:07 PM
09/28/18 11:07 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
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If I remember correctly all the GM superchargers were mounted on the exhaust side of the engine-wouldn't have any fuel cooling there They where set up to blow the exhaust out of the two stroke diesel motors, not force air into the cylinders OP, the blowers heat up, all of them, when they compress air The more pressure into the motor and the faster you turn the blower the hotter the manifold inlet temps get without a intercooler Another thing to consider is on a Roots type motor mounted super charger the motor heat rises and will be conducted into the inlet manifold as well as the blower case from the heads and intake manifold
Last edited by Cab_Burge; 09/28/18 11:07 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Dry blower
[Re: TRENDZ]
#2556137
09/28/18 11:09 PM
09/28/18 11:09 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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In the diesel application, they run dry. Only intake air runs through them. But in a diesel application they are there to make sure air is only moving in one direction, like a reed valve. They also assist blowing out the spent exhaust gasses. There is no compressing or boost created by the blower in the original application, so the blower assembly doesn’t get hot.
"use it 'till it breaks, replace as needed"
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Re: Dry blower
[Re: TRENDZ]
#2556227
09/29/18 11:54 AM
09/29/18 11:54 AM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
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Important difference: all Roots blowers move air in the space between the rotor lobes and the case wall, nothing passes between the rotors (which almost completely interlock). A twin screw type compresses air between the rotor lobes. The lobes never completely fill the opposite empty (mirror image) spaces. The inter-lobe volume is greatest at the intake port and gradually shrinks (lobes fill more of the space) until released in the manifold.
w/r/t screwed to the rear All helixed rotors move the air forward, look how small the Eaton discharge port is (compared to the full length G.M.C. etc. window). "Better" was invented 27 years ago, and no one caught on...
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