While some centrifugal superchargers are consistent and reliable, they typically do not produce full boost until near peak engine rpm, while positive displacement superchargers such as Roots type superchargers and twin-screw types offer more immediate boost.
2.
Referring to the Volumex model " Autocar " magazine reported that despite the fitting of a Roots-style positive displacement supercharger " fuel economy is not penalised; an overall consumption of around 28 mpg has been quoted by Lancia ".
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