The Bentley Mulsanne paired a modern luxury sedan with a 6,750-cc (6¾-litre) twin-turbo V8, an unusually large engine as the industry moved toward smaller designs. In the relevant production-car twin-turbo V8 context, it was among the largest by displacement—not an unrestricted record across trucks, racing, marine engines, or every later application. The engine combined traditional low-revving character with extensive modern engineering.
How much power did the Mulsanne’s V8 make?
The standard modern Mulsanne launched with 505 bhp and 1,020 Nm (752 lb-ft) of torque, peaking at 1,750 rpm. Bentley quoted a 0–60 mph time of 5.1 seconds and a top speed of 184 mph. The Mulsanne Speed raised output to 530 bhp and 1,100 Nm (811 lb-ft), with claimed figures of 4.8 seconds to 60 mph and a 190-mph top speed.
| Version | Power | Torque | 0–60 mph | Top speed |
|---|---|---|---|---|
| Standard Mulsanne | 505 bhp | 1,020 Nm (752 lb-ft) | 5.1 seconds | 184 mph |
| Mulsanne Speed | 530 bhp (537 PS) | 1,100 Nm (811 lb-ft) | 4.8 seconds | 190 mph |
These are Bentley’s published specifications. The eight-speed ZF automatic sends power to the rear wheels. Bentley’s Mulsanne launch information and heritage specifications document the figures and equipment.
What “world’s biggest” means here
The headline refers to displacement among production-car twin-turbo V8s in the Mulsanne’s period and class context. At 6,750 cc, the Bentley engine was an exceptional size for a production passenger car. It is more precise to call it one of the largest in that category than to claim a timeless record across all vehicles and engine applications. Bentley’s formal historical claim was that the underlying V8 was the longest-serving V8 in production.
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Its significance was not size alone. The engine delivered a large reserve of torque at low engine speed, allowing the Mulsanne to accelerate without needing the driver to chase high revs. Contemporary road testing described quiet cruising and a strong surge when called upon. Car and Driver’s Mulsanne drive offers a period account of that character.
From 1959 L-Series V8 to Mulsanne engine
The engine’s lineage began with the Rolls-Royce–Bentley L-Series V8, introduced in the 1959 Bentley S2 and Rolls-Royce Silver Cloud II. It initially displaced 6.23 litres. In 1971, the capacity grew to 6¾ litres through a longer stroke. Turbocharging came later, followed by the twin-turbo development used in the Mulsanne.
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This was continuous evolution, not an engine left unchanged for six decades. Bentley added technologies including fuel injection, variable cam phasing, and cylinder deactivation, and repeatedly redesigned components. The Mulsanne version used revised internal parts—including a forged crankshaft, pistons, and connecting rods—to reduce mass, friction, and internal loads. Bentley described it as a hand-built Crewe engine and the latest iteration of the V8 first put into production in 1959. Bentley’s V8 anniversary account traces those developments.
Why the Mulsanne’s large V8 stood out
Much of the industry pursued smaller engines, while Bentley retained a large-capacity V8 for its flagship sedan. Its 1,750-rpm torque peak helped make acceleration feel readily available without high engine speeds. Bentley also introduced cam phasing and cylinder deactivation, combining the engine’s traditional character with newer controls rather than relying on displacement alone.
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The standard and Speed versions show how Bentley developed the same basic proposition for different outputs. The Speed raised power and torque, but the standard car was already a 505-bhp, 1,020-Nm luxury sedan. Neither figure should be attributed to every Mulsanne version: the 530-bhp specification belongs to the Speed and the final 6.75 Edition.
The final Mulsanne and the end of the V8
Bentley revealed the modern Mulsanne in 2009 after a four-year development program. The model served as the brand’s flagship for roughly a decade. Production ended in 2020, when the final Mulsanne was completed and the L-Series 6¾-litre V8’s production history came to a close. The last 6.75 Edition by Mulliner used the high-output 530-bhp specification and was limited to 30 cars.
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Bentley reported that 35,898 examples of the V8 had been produced from 1959 through its 2019 anniversary, and that the engine had powered 23 Bentley models. The Mulsanne’s place in that history is therefore both technical and symbolic: it brought a repeatedly modernized engine architecture to the end of its production run in a flagship designed around effortless performance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Was the Bentley Mulsanne’s V8 the world’s largest twin-turbo V8?
It was among the largest-displacement twin-turbo V8s fitted to production passenger cars in its period and class context, at 6,750 cc. Avoid treating “world’s biggest” as a universal record covering every type of vehicle or engine application.
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How much torque did a standard Mulsanne produce?
Bentley rated the standard Mulsanne at 1,020 Nm (752 lb-ft), with peak torque at 1,750 rpm. The Mulsanne Speed produced 1,100 Nm (811 lb-ft).
Were all Mulsannes rated at 530 bhp?
No. The standard Mulsanne was rated at 505 bhp. The Mulsanne Speed and final 6.75 Edition used the 530-bhp specification.
When did Bentley stop making the Mulsanne V8?
The final Mulsanne was completed in June 2020, marking the end of production for the L-Series 6¾-litre V8.
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