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U.S.
British
German
Japanese  
British Engines:
Merlin

Merlin
General Characteristics
(Merlin 61)
Type:
12-cylinder supercharged
liquid-cooled 60° "Vee" piston
aircraft engine

Bore: 5.4 in
Stroke: 6 in
Displacement: 1,647 in³
Dry weight: 1,640 lb
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Performance
Power output:
1,565 hp at 3,000 rpm @12,250 ft
1,390 hp at 3,000 rpm @23,500 ft

Source: Wikipedia.com

Aircraft installations:
Spitfire
, P-51



Source: Vintage V-12's

Rolls-Royce Merlin
The Merlin was a 12 cylinder, 60° "V", 27 litre, liquid cooled piston aircraft engine built during World War II by Rolls-Royce and under licence in the United States by Packard.

It was one of the three best aero engines in the world at that time, and powered many notable warplanes. The Merlin name came from a bird (a small falcon also known as "pigeon hawk") rather than King Arthur's legendary magician.

Engine Components

Valvetrain: Overhead camshaft-actuated, two intake and two exhaust valves per cylinder, sodium-cooled exhaust valve stems

Supercharger: Two-speed two-stage, boost pressure automatically linked to the throttle, water-air aftercooler installed between the second stage and the engine.

Fuel system: Twin-choke updraft carburetor with automatic mixture control
Oil system: Dry sump with one pressure pump and two scavenge pumps.

Cooling system: 70% water and 30% ethylene glycol coolant mixture, pressurized.

Source: Wikipedia.com