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Re: cage blowers
bad answer. to drive it hard enough to produce any real pressure, it would fly apart. there are reasons that turbos and blowers are designed the way they are. a fan as you are suggesting, is a non positive displacement unit. seal it off, and it continues to turn without producing anything. roots blowers are positive displacement, and produce a certain number of cfm per revolution. Turbos are variable displacement, in that they can produce varying cfm in relation to engine speed, relying on exhaust gas expansion to increase the speed, and therefore volume and pressure.
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