There is no such thing as a V4 engine. In I4, the I stands for "inline". Basically, all 4 cylinders are in a straight line.
When you use more than 4 cylinders, such as 6 or 8, vibrations may result. Thus, in a V6 or V8, the cylinders form a V-shape. This is to reduce the vibration of the engine since the cylinders are fired in a certain way.
Putting 4 cylinders into a v-shape would not have any benefit at all. Thus, a V4 does not exist.
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