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V4 engine
A V4 engine is a type of four-cylinder engine, a Vee-form engine with four cylinders. A V4 engine typically has three main bearings. Usually one bank of cylinders will comprise cylinders # 1&3, and the other bank # 2&4. For reasons of packaging, the Honda VFR1200 has a 1&4, and 2&3 layout, meaning one bank is longer than the other.
==Advantages and disadvantages of the V4 engine==
Compared to an inline-four, the advantages of the V4 engine include compactness, short length along the crankshaft, and, with a 90° V-angle, perfect primary balance giving a smooth and nearly vibration-free operation.
A disadvantage is that, as with a V-twin, it is more difficult to locate ancillaries, inlet systems, and exhaust systems. A V4 is usually more expensive to produce than an equivalent in-line four, having double the number of cylinder blocks, cylinder heads, and inlet and exhaust systems. Also, while a V-4 is essentially two V-twins side-by-side, a V4 can have a rocking couple that is not present in a V-twin. The compact 60° V4 is not perfectly smooth and needs a balance shaft.
In modern times, the V4's advantages have made it particularly suitable for motorcycles and outboard motors; but the advantages in a car have been found not to be worth the expense, especially as access for maintenance can become more difficult.
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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