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V10 engine
A V10 engine is a V engine with 10 cylinders in two banks of five. It is longer than a V8 engine but shorter than a straight-6 engine or V12 engine.
== Mechanics ==
The V10 is essentially the result of mating two even-firing straight-5 engines together. The straight-5 engine shows first and second order rocking motion. 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. The firing sequence is odd (BMW S85, Dodge Viper, Volkswagen Touareg). Using an 18° split journal crankshaft the firing order can be made even, and the two balanced shafts do not balance each other completely, but are combined into a single very small balance shaft (Lamborghini V10, Porsche Carrera GT). 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 small balance shaft (Toyota 1LR-GUE engine). 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.
The V10 configuration is not an inherently balanced design like a straight-6, V-12, boxer engine, or V-8 (ignoring the counterweights) and does still have a small second order rocking motion, which can only be compensated by balance shafts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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