sentences:  Most V8 engines fitted to road cars use a cross-plane crankshaft, since this configuration has less vibrations due to the perfect primary balance and secondary balance.The cross-plane crankshaft has the four crank pins (numbered from the front) at angles of 0, 90, 180, and 270 degrees, which results in a cross shape for the crankshaft when it is viewed from one end.The iconic rumbling exhaust sound produced by a typical cross-plane V8 engine is partly due to the uneven firing order within each of the two banks of four cylinders.