Leste et sted at de sjeldne engelske Shorrock-kompressorne var overlegne Judson og Mag, googlet litt på det. Spørs om det er gasseren som er nøkkelen til mer power:
"If you mention the words "supercharging" and "Beetle" in the same breath , most people will immediately think of Judson, the American-made vane-type blower from Conshohocken, Pennsylvania. However, back in the '60s it was possible to buy a British-made unit that could be fitted to your Volkswagen: the Shorrock.
Designed and developed by Chris Shorrock, it was available as a kit to fit a whole range of different vehicles, the most popular being such makes as British MGs and Fords. The Volkswagen connection came about when Shorrock looked into tuning the Beetle in the very early '60s and was then approached by Joe Vittone of EMPI in 1963. Vittone was visiting the UK to meet various companies with a view to marketing their products in the USA under the EMPI banner.
What impressed him about the Shorrock system was that it was a properly designed conversion that used a carburetor other than the original. Other supercharger conversions, such as the Judson or the Swiss-made MAG kit, relied upon the poor old 28mm Solex which came on the basic 1200 engine of the time. Shorrock argued, quite justifiably, that there was
no way in which such conversions could be efficient if the stock carburetor was retained. Indeed, other blower manufacturers earned supercharging as a whole a bad name largely because of this. The main problem was an inability to deliver the correct amount of fuel to the engine throughout the rev range, under all kinds of load."
http://beetle.cabriolets.free.fr/tech/how01.htm (av Keith Seume)
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