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Flat Plane Vs Cross Plane V8 engines. A flat plane V8 (animated on the left) is very much like two inline-4 engines mated together in a V configuration. Therefore end-to-end balance is inherent, as the first and last piston of a bank is always exactly in the same position, as are the center two pistons on each bank.
Old-styled aircraft engines are a good example of this design. The difference between these two engines is that Radial engines have pistons that move in a reciprocating fashion that cause the crankshaft to rotate. In rotary engines however, the crankshaft does not rotate. Instead, the cylinders that accommodate the reciprocating pistons will rotate around the crankshaft.