pages 459-463 for details.) Engines with particular balance advantages include: Straight-6 Flat-4 with two geared crankshafts Flat-6 Flat-12 V12 Engines with characteristic problems include: Flat-4 boxer and straight-4 using a single crankshaft have no better kinetic energy balance than a single, and require a relatively large flywheel. Crossplane V8, which requires