School Me On Why Boost...?

Discussion in 'General Conversation' started by Skoolme, Mar 8, 2016.

  1. Skoolme

    I've heard roots blowers generate more heat than others. What I don't understand is why. Don't they all pump air, what's the difference? Is just the way it sits on the manifold that makes heat
     
    Skoolme, Mar 8, 2016
    #1
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  2. vinces427bb Staff Member

    vinces427bb, Mar 9, 2016
    #2

  3. SCF/HAIC Staff Member Admin

    Maybe this will help. This example is with a two lobe blower. Older Eatons are 3 lobe and the newer (more efficient) TVS blowers are four lobe.
    Roots Supercharger 16 fps.gif #ad


    Notice at the output side, a small amount of compressed air is pulled back towards the pressurized side. They call this slip, and it causes inefficiency as it must repumped. Plus the lobes striking incoming air to scoop it down stream towards the high pressure side. Towards the end of the trip, the air is always squeezed. With a twin screw or centrifugal there is more of a constant stream moving, none of this slip and no internal pressuring. The pressure only exists because the volume moved exceeds the volume the engine wants to naturally take in, whereas a roots is compressing it internally.
     

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    SCF/HAIC, Mar 9, 2016
    #3

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