The Bentley Mulsanne's engine is massive by today's standards. The 6.75-liter, twin-turbo V8, hand-assembled by a small clutch of engineers in a corner of the company's Crewe factory, produces 505hp at 4200 RPM. But that's only part of the story.

This week on /INSIDE BENTLEY, we get a look at what goes into building an engine of very plenty torques. That is, 752 lb-ft at 1750 rpm, or sufficient to break inertia on a near-6000-pound luxury car, launching it from 0-60 in 5.1 seconds. That's like John Goodman running the 50-yard dash in, er, 5.1 seconds.

It sounds pretty old-world — the prodigious crank, coffee-can-sized pistons, cam in block, pushrod-actuated valves and 10.5 liters of oil — though it does have cylinder-deactivation, a nod (more like a wink) to modern efficiency standards. Still, the engine is a marvel of quality and craftsmanship, even if its petrol-devouring days may be numbered. Your next $300,000 Bentley may just have a diesel.