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Packard 1A-2500
Packard 2A-2500
Packard 3A-2500
Packard 4A-2500
Packard 1A-2500
Packard 5A-2500

Packard 3A-2500


The Packard 1A-2500 is an American V-12 cylinder liquid-cooled aircraft engine designed and first run in 1924. Of the five variants produced the 3A-2500 was the most numerous.
Equipment supplied was a fuel pump, propeller hub attaching parts, and tool kit. Available at extra cost was an Aeromarine starter.
A total of 258 were built. The unit cost for the geared 3A-2500 was $19,375.
The marine version of this engine was used in most PT boats as the 3M/4M/5M-2500.


1924, 800 hp. Six built.

1925, 800 hp. 75 built.

1926, Geared propeller drive option, 800 hp. 175 built.

1927, fitted with a supercharger, 900 hp. One built.

1930, experimental use only, 1500 hp. One built.


Type: 12-cylinder V engine
Bore: 6 3⁄8 in (160 mm)
Stroke: 6 1⁄2 in (170 mm)
Displacement: 2,490 cu in (40.8 L)
Dry weight: 1,120 lb (510 kg)
Valvetrain: Four valves per cylinder, overhead camshaft
Fuel type: Petrol
Cooling system: Liquid-cooled
Power output: 850 hp (630 kW) at 2,500 rpm
Specific power: 0.33 hp/ (15.2 kW/lt)
Power-to-weight ratio: 0.76 hp/lb (1.25 kW/kg)


Type: V-12 water cooled
Approved Type Certificate No.19
Military Rating: 835 hp at 2100 rpm
Commercial Rating: 800 hp at 2000 rpm
Displacement: 2540
Compression ratio: 5.1-1
Bore: 6 3/8 in
Stroke: 6 1/2 in
Length: 69 3/4 in
Width: 29 1/2 in
Height: 42 in
Weight: 1210 lb
Fuel consumption: not more than .52 lb/hp/hr
Oil consumption: not more than .025 lb/hp/hr
Ignition: Delco or Sintilla dual
Carburation: Dual Stromberg NAS-12
Spark plugs: 2 per cylinder B.G. Hornet
Price: direct drive $15,625 – geared $19,375







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