A slew of new European gasoline engines highlighted the recent Geneva Motor Show. Topping the list, General Motors Corp.'s European arm, Adam Opel AG, unveiled a 2.2L all-aluminum unit distinguished by twin balancing shafts integrated into the cylinder block. Their projecting housings stiffen the block for even smoother operation, in contrast to retrofitted shafts tacked onto a crankcase merely to counteract vibrations. The 2.2L's counter-rotating shafts are chain driven at half crank ...

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