Supercharger load factor
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Tuned
Joined: Nov 2003
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From: CT
Supercharger load factor
Just got thru installing a Powerdyne SC kit on my 99 Mountaineer a few weeks ago, and although it is awesome I was wondering what amount of HP is needed to keep it spinning when not in boost?
I assume it requires more than any other because it is centrifugal and not a roots or screw type that would require much less??
TIA,
Kurt
I assume it requires more than any other because it is centrifugal and not a roots or screw type that would require much less??
TIA,
Kurt
Tuned
Joined: Sep 2003
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From: Arkansas
Originally Posted by kurthb
Just got thru installing a Powerdyne SC kit on my 99 Mountaineer a few weeks ago, and although it is awesome I was wondering what amount of HP is needed to keep it spinning when not in boost?
I assume it requires more than any other because it is centrifugal and not a roots or screw type that would require much less??
TIA,
Kurt
I assume it requires more than any other because it is centrifugal and not a roots or screw type that would require much less??
TIA,
Kurt
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Tuned
Joined: Nov 2003
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From: CT
Is that to say that at full boost a centrifical requires less hp than a roots or that although it requires more hp, the final hp made is greater?
What about not under boost? I would think here that the roots require much less hp to spin than a centrifical?
Just need a clarification...
Thanks
What about not under boost? I would think here that the roots require much less hp to spin than a centrifical?
Just need a clarification...
Thanks
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Tuned
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From: CT
I am now wondering why a centrifical would require less hp than a roots as a centrifical is actually compressing the air while a roots is just blowing more air...? It would seem to me that compressing the air takes more energy than just trying to shove air into the intake?
Many sites state that the roots need only a few hp to spin when not in boost..and some say that a centifical requires upwards of 80hp when in full boost....
Many sites state that the roots need only a few hp to spin when not in boost..and some say that a centifical requires upwards of 80hp when in full boost....
Tuned
Joined: Sep 2003
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From: Arkansas
Roots have a bypass system to vent uneeded boost and cetrifugals have a similar setup....so neither one has much parasitic drag in non-boost conditions. Now as the systems come under boost the centrifugals are far more efficient...put much less heat into the air charge. Yes...centrifugals can sap up to 80 Hp. Roots and screw-types will soak up to 100 hp. In the Ford GT the twin screw supercharger takes up 89 hp at 8 psi. One clue is to look at the number of ribs on the belts they include with the setups...centrifugals typically come with 6 to 8 rip setups while roots come with 8 - 10 rib belts to handle the higher horsepower transfers.
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From: Calhoun GA
Originally Posted by 2000BLK54
...centrifugals typically come with 6 to 8 rip setups while roots come with 8 - 10 rib belts to handle the higher horsepower transfers.
Last edited by Blurry94; Dec 8, 2004 at 07:50 PM.
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Tuned
Joined: Nov 2003
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From: CT
....that is a lot of power to make power! Overall it seems inefficient, that conventional mods would be the way to go as you are adding + HP without sacrificing HP to do it????? Logicly thinking
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Joined: Nov 2004
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From: Troy, MI
kurthb, all superchargers and turbos compress air, you cant force more air in the cylinder than it can already take without compressing it. the raise of compression in the cylinder is based off the amount of boost. typically a 9:1 compression motor at 5psi boost will have 12.1:1 compression.
i would think that with the increased weight of the screw or roots blower parts, it would put more drag on the belt system than a centrifical. what are we talking about here like 10hp?
i would think that with the increased weight of the screw or roots blower parts, it would put more drag on the belt system than a centrifical. what are we talking about here like 10hp?
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From: Destin/Ft. Walton Beach,
The amount of energy that a supercharger requires to turn it, is 100% dependent on the amount of boost that is being forced into the engine. No matter what kind of supercharger it is. The only factors that are different, are at what rpm the boost is made, and how much boost is being bypassed. For every action, there is an equal and opposite reaction. It's called physics. No form of supercharger can break the laws of physics.
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Joined: Nov 2004
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From: Troy, MI
steve that is good info, we are trying to figure out what energy is required to turn each type at low to 0 boost situations like cruising. i guess if you consider that the centr. blower doesnt kick in til around 3k+ rpms, the boost will be 0 most the time requireing less power. that is why ppl like roots/screw blowers on the street since you have boost even at normal driving. now which one uses more power at 0 boost?