Page "V10 engine" Paragraph 2
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Wikipedia
Here it should be assumed that the crankshaft with low second-order vibration is used and the first order is balanced by a balance shaft.
By mating the straight-5 banks at 90 degrees and using five throws the balance shafts balance each other and become null.
Using an 18 ° split journal crankshaft the firing order can be made even, and the two balanced shaft do not balance each other completely, but are combined into a single very small balance shaft ( Lamborghini Gallardo ).
Using a five-throw crankshaft and 72 ° bank angle the firing order can be made even, and the two balanced shafts do not balance each other completely, but are combined into a single A 36 ° degree bank angle and a 108 ° flying arm crankshaft would allow even firing without a balance shaft and smaller counterweights, but would be impractical.
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