Crossplane Crankshaft

It gives smooth running and good balance. Uneven firing per bank creates the typical V8 burble. Heavy counterweights make it slower to rev. The term is also used for some motorcycle engines with similar crank layouts.

The 90-degree pin layout cancels most vibration forces between the two banks.

Exhaust design matters, as each bank fires unevenly. Counterweights add rotating mass.