Quote:
Originally Posted by Kurfürst
Nope.
DB 601A-0.
"Gemischung durch: 1 Bosch PZ 12 HM 100/11 Einspritzpumpe für 12 Zyl."
"Lader: einstufiges Schleudergeblaese mit barometrischer regelung"

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Well, we have the test data of the V15a showing clearly a supercharger with two fixed speeds instead hydraulic clutch and this is supported by Von Gersdorf et.al. Any source can contain errors or projected things which happened later, this is why any source should be contested. In this case your source, what ever it is, is easily contested because the characters of the hydraulic clutch are not there and Von Gersdorf et.al. can be seen as more credible source (generally the secondary source is seen more credible because it's better contested and refined, like in wikipedia).