Under the skin: What Bentley's W12 owes to Volkswagen's VR6 | Autocar

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Under the skin: What Bentley's W12 owes to Volkswagen's VR6 | Autocar
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Bentley's famed W12 engine owes a lot to Volkswagen's VR6. We explain why that's the case:

An engine’s cylinders are almost always arranged in a straight line, which is fine unless space in the engine bay is at a premium. That’s the case in transverse applications, which is why most six-cylinder front-wheel-drive cars are fit ted with vee-configuration engines.

As with any thing, the typical V6 is a trade-off. The engine is a lot shorter than an in line six, which benefits longitudinal configurations as well as transverse, but it’s wider. It also lacks the natural perfect balance of a straight six and packaging the exhaust is more complex than for any inline engine.

It has one cylinder block but instead of the cylinders being arranged on one centre line, they sit alternately on two parallel centre lines in a staggered fashion, allowing them to be slightly overlapped. With that in mind, it’s easy to picture what the W12 looks like with one ‘proper’ vee and a pair of sort-of-vees, and it’s wonderfully compact into the bargain. Each bank has its six cylinders arranged in a 15deg staggered formation and then the two banks are inclined at 72deg.

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