The Rolls-Royce Merlin Mark 20 Series is a liquid-cooled Vee engine displacing 1,649 cubic inches and producing nearly 1,650 horsepower. It has two separate blocks of six cylinders with overhead valves, rockers and camshafts. The connecting rods are six pairs, plain and forked, working on a one-piece, balanced, six-throw crankshaft. The forward end of the crankshaft drives the spur reduction gear for the propeller. Gears at the rear of the crankshaft drive the wheelcase auxiliaries, including a two-speed centrifugal supercharger. This has a central entry, coupled to an updraught, twin-choke, fully automatic carburettor. The required throttle opening for a given power is adjusted, independently, by an automatic boost control unit to suit varying intake pressures. Multi-ejector exhaust manifolds, secured to each cylinder block, discharge through openings in the cowling side panels.

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Operator's Handbook
Rolls-Royce Merlin MK. Nos. 22, 24 and T24

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