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SVTPerformance's Chain of Restaurants
The Blower Bistro
Wanted a Kenne Bell but...
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<blockquote data-quote="98 Yeller' SVT" data-source="post: 1003107" data-attributes="member: 7862"><p>Ehh, I'm not sure about that one, centri's may be slightly more efficient than "roots" type blowers like those found on the 03 Cobra...but dont confuse Roots blowers with Twin screws, they are two totally different animals, to illustrate here is a write up I found....</p><p></p><p></p><p></p><p>LYSHOLM COMPRESSORS (K/B twin screws)(also called screw compressors) offer all the advantages of roots type blowers and then some. This design’s pros and cons are very similar to Roots s/c’s, with one major difference; efficiency. Typically these compressors have peak adiabatic efficiency AT OR ABOVE centrifugal designs.</p><p>Externally these look nearly identical to the current Eaton design, but internally they do have some differences. The main difference between roots and lysholm compressors is in how the two rotors interract in the supercharger housing; being that the roots rotors really don’t. Lysholm compressors have the familiar two rotor, twisted lobe design, but each usually has 4 lobes instead of 2 or 3, and each rotor’s lobes have their own specific shape. One rotor will have thin blade style lobes with a fat ridge on top, while the other will have fat teardrop shaped lobes with a sharp edge. As the two rotors spin, the lobes interlock to form nearly airtight sections within the supercharger housing. This interlocking and sealing action is where the design gets it’s advantages over roots blowers, being better thermal efficiency and much improved high pressure boost performance. Roots designs don’t seal internally very well between the lobes of each rotor, and so are prone to leak air out of the system as they operate. This is partially why they have inherently lower thermal efficiencies than other designs, and entirely why they don’t perform very well in high boost situations. Put simply, the greater the pressure difference between one side of the supercharger and the other, the more leaking of air occurs. This increases air turbulence, lowers flow potential, and limits efficiency all at once. Lysholm compressors combat this through the basic rotor design, and they have been proven to work very well.</p></blockquote><p></p>
[QUOTE="98 Yeller' SVT, post: 1003107, member: 7862"] Ehh, I'm not sure about that one, centri's may be slightly more efficient than "roots" type blowers like those found on the 03 Cobra...but dont confuse Roots blowers with Twin screws, they are two totally different animals, to illustrate here is a write up I found.... LYSHOLM COMPRESSORS (K/B twin screws)(also called screw compressors) offer all the advantages of roots type blowers and then some. This design’s pros and cons are very similar to Roots s/c’s, with one major difference; efficiency. Typically these compressors have peak adiabatic efficiency AT OR ABOVE centrifugal designs. Externally these look nearly identical to the current Eaton design, but internally they do have some differences. The main difference between roots and lysholm compressors is in how the two rotors interract in the supercharger housing; being that the roots rotors really don’t. Lysholm compressors have the familiar two rotor, twisted lobe design, but each usually has 4 lobes instead of 2 or 3, and each rotor’s lobes have their own specific shape. One rotor will have thin blade style lobes with a fat ridge on top, while the other will have fat teardrop shaped lobes with a sharp edge. As the two rotors spin, the lobes interlock to form nearly airtight sections within the supercharger housing. This interlocking and sealing action is where the design gets it’s advantages over roots blowers, being better thermal efficiency and much improved high pressure boost performance. Roots designs don’t seal internally very well between the lobes of each rotor, and so are prone to leak air out of the system as they operate. This is partially why they have inherently lower thermal efficiencies than other designs, and entirely why they don’t perform very well in high boost situations. Put simply, the greater the pressure difference between one side of the supercharger and the other, the more leaking of air occurs. This increases air turbulence, lowers flow potential, and limits efficiency all at once. Lysholm compressors combat this through the basic rotor design, and they have been proven to work very well. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
Wanted a Kenne Bell but...
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