Richtig, das sind die beiden Ausgleichswellen dank derer der Motor fast so ruhig läuft wie ein 4-Zylinder - und in der Herstellung fast genau so teuer war
"The Daihatsu A-series engine is a range of compact two-cylinder, internal combustion piston engines, designed by Daihatsu with the aid of their owner Toyota. The petrol-driven series has cast iron engine blocks and aluminum cylinder heads, and are of an SOHC lean burn design, with belt driven heads. The head design was called "TGP lean-burn", for "Turbulence Generating Pot".[1] The engine also had twin-balancing shaft, which provided smoothness equivalent to that of a traditional four-cylinder engine -
although it also cost nearly as much to build...."
Ganzer Text
Der AB20 Small-Block mit 547 ccm im Bus läuft übrigens wesentlich ruhiger als der AD10 Big-Block mit 617ccm im Cuore.
