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Packard V-1650 (Merlin)

Configuration: 12-Cylinder vee, liquid-cooled. Two stage, two-speed supercharger (single stage on earlier models)

Specifications:
Information for Merlin 61 (V-1650 similar)
Cylinder Bore: 137.16mm
Cylinder Stroke: 152.2mm
Displacement: 1,649 cu. in. (27 liters)
Compression: 6 to 1
Length: N/A
Width: N/A
Height: N/A
Weight: 744 kg.
Combat Power: 1565 hp at 3740m
Take-off Power: 1290 hp
Revolutions: 3000 rpm

Comments:
U.S. version of Rolls-Royce Merlin, produced under license by Packard. This engines initially suffered from cooling problems but after the kinks were worked out this powerplant did very well, powering the P-51 Mustang as well as several types of British aircraft.