Since this engine only displaces 1.2 liters, vibration-canceling balance shafts are not necessary. Larger powerplants with more internal mass require these parts to keep them from shaking like a shiatsu massager.
All told the Downsizing Demonstrator is quite refined for a non-production engineering test mule. Some vibration does percolate through the engine mounts and into the passenger compartment but it’s no worse than other engines on the market today. An added bonus is the inline-three’s firing interval, which makes it sound quite like a small V6.