Comparison To Roots
The obvious advantage of the Powerplus over the Roots was avoidance of the need to machine the complex-shaped rotors. With the manufacturing technology of 1930, this was a serious consideration. Eyston himself already held patents related to these manufacturing difficulties.
The problem with Powerplus was firstly its complexity. Although each component was of simple form, there was some number of them, including a separate Bosch oil pump. This reduced reliability, compared to the simplicity of a Roots (once manufactured).
Secondly, studies by NACA revealed that the Powerplus was less efficient than the Roots, i.e., more power was required to drive it. This was most pronounced at low-pressure differences. Where out-and-out performance was crucial, the Powerplus was competitive. However it was not likely to be preferred where efficiency or reduced fuel consumption were the deciding factors.
Read more about this topic: Powerplus Supercharger
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