Specializing in Technical History

Rolls-Royce Merlin 20


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

Merlin 20 The Rolls-Royce Merlin Mark 20 Series is a liquid-cooled Vee engine displacing 1,649 in³ 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.

 

Contents 1
Contents 2
Contents 3
Contents 4
Contents 5

 

Transverse Section
Lubrication Diag
Power Curves

 


Operator’s Handbook, Rolls-Royce Merlin Mk. Nos. 22, 24 and T24

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R-R Merlin 20 Operator’s Handbook

DCD40527013

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