Packard 1A-2775
The 1A-2775 by Packard is an example of an X-motor of 1926 . It has four cylinder banks with six cylinders each (X24).
In this liquid-cooled four-stroke gasoline engine, the individual cylinder bank angles are not regular (90 °, 90 °, 90 °, 90 °), but shifted like a pair of scissors: 120 °, 60 °, 120 °, 60 °. The engine is described in US Patent 1889583.
As with the radial engine crank mechanism, the secondary connecting rods are attached to the main connecting rod. The crankshaft housing of this engine is made of one piece. This should save weight and improve strength. But it made it more difficult to assemble the engine. The engine is related to the Packard 1A-1500 V-engine . So is in both engines z. B. the crankshaft is the same length. The aim was to save costs by using the same parts .
He was built z. B. in the Packard X Racing tarpaulin . Lieutenant AJ Williams reached a top speed of 518 km / h on the plane. In total, only three engines were built. Number 1 is now in the Smithsonian .
photos
- Drawing from US Patent 1889583
Side view
Tip of the engine's nose
crankshaft
Main and secondary connecting rods
Technical specifications
- Power: 1250 hp (1500 hp with supercharging) at 2700 rpm
- Weight: 686 kg
- Stroke: 5 inches = 127 mm
- Bore: 5 3/8 inches = 136.5 mm
- Displacement: 2775 cu in = 45.47 l
Web links
- image
- Packard 1A-2775. (PDF; 8.4 MB) In: packardsinternational.com. P. 40 , archived from the original on March 9, 2005 ; accessed on June 11, 2016 .
- enginehistory.org , Packard engines (PDF; 90 kB)
