The Difference Between V12 and W12

The differences between V12 and W12 engines can be summarised in 3 key points:

1. Structural differences. The W12 engine's advantage lies in its more compact structure, allowing for a greater number of cylinders and larger displacement. Its drawbacks include excessive complexity and inferior operational balance.

The V12 engine's strengths are: stability, lower cost, simpler construction, excellent operational balance, and compact size. However, its main disadvantage is that engine length increases significantly when displacement and cylinder count rise.

1. Different cylinder arrangements. The W12 engine employs a distinctive W-formation rather than the traditional V-shape. With maximum output reaching 450 horsepower, it delivers 39 kilowatts more power than the Mercedes S600's 6.0-litre V12 engine – equivalent to the combined output of 3.5 Bora 1.8-litre engines.
2. Contrasting power delivery. Compared to the V12, the W12 lacks instantaneous excitement, excelling instead in sustained power delivery while being weaker in explosive acceleration. The W12's strength on the road isn't short-distance overtaking bursts, but rather its ability to leave competitors behind after overtaking. It's more of a marathon runner, winning through endurance rather than sprinting. However, under extreme conditions, the V12 produces less noise than the W12.

Engine displacement represents the total working volume of all cylinders, typically measured in litres. A cylinder's working volume refers to the gas volume swept by the piston moving from top dead centre to bottom dead centre, also called single-cylinder displacement, which depends on bore diameter and piston stroke.

From an engineering perspective, the W12 is essentially two VR6 engines merged at a shallow angle, forming a W shape. This allows it to be shorter than a V12, fitting into cars where space is limited. The V12, with its traditional V layout, is longer but mechanically simpler, often preferred for its balance and reduced vibration. The W12’s complexity can lead to higher maintenance costs over time.

The key difference between a V12 and W12 engine lies in their cylinder arrangement. A V12 has two banks of six cylinders arranged in a V-shape, typically at a 60-degree angle, while a W12 combines two narrow-angle VR6 engines in a W-configuration, creating a more compact design.

V12 engines are known for their smooth power delivery and balanced performance, often found in high-end performance cars like the Aston Martin DBS or Ferrari 812 Superfast. The V12’s layout allows for excellent refinement and linear power, making it ideal for luxury grand tourers.

The W12, used in models like the Bentley Continental GT and Audi A8, is more space-efficient, allowing manufacturers to fit a 12-cylinder engine into tighter engine bays. However, its complex design can make servicing more challenging. Both engines deliver exceptional power, but the W12 sacrifices some smoothness for compactness.

For drivers prioritising a silky, high-revving experience, the V12 is superior. If packaging efficiency matters more, the W12 is the better choice.