Why Do People Use Multiple Roots Style Superchargers at Once?

I have always questioned what was the points of doing this that is logical when I see them?

Let me know what you think.




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For show, it's not efficient or practical at all

 

If they were mounted side-by side in parallel that would be different but in series...naaa...
That show car is even turbo charged..

ks

 

If all three blowers are identical and pullied the same, they will all move the same air as one. Only because those blower are "displacement" blowers. If say screw blowers where stacked, there would be stacked pressure increases because they are able to compress air in the rotors.

 

The blowers I posted there are compound boosted, not to mention twin turbocharged also… I don’t agree with clogging up a supercharged engines exhaust with a turbo under normal situations. Thinking about the technical aspects to the twin turbo triple compounded positive displacement supercharged carbed engine gives me a headache haha, I still think it’s unique though.

 

At high boost, Roots blowers become very inefficient and it becomes more efficient to compress in stages with multiple Roots in series..

Twin-charging - a turbo in front of a blower - gives you the best of both worlds. The blower supplies boost at low revs and instant throttle response. The turbo offers high compressor efficiency at high revs and higher outright power (no crankshaft drive power)

 

I can argue that the above stacked blowers and not compounded. Based on pulley sizes, the bottom two are pullied the same, and the top blower is actually under driven from the bottom two. So the top blower is the controller of all air flow. Im not counting the turbos.

 

Top blower looks different. Must be bigger.