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Hirth HM 506

The Hirth HM 506 was a six-cylinder air-cooled inverted inline engine that was developed from the earlier four-cylinder HM 504. The HM 506 was a popular engine for light aircraft of the 1930s to 1940s and powered the Bücker Bü 133A model trainer. The engine featured a cast magnesium alloy crankcase.

General characteristics
• Type: 6-cylinder air-cooled inverted inline
• Bore: 105 mm (4.13 in)
• Stroke: 115 mm (4.53 in)
• Displacement: 5.976 L (364.7 cu in)
• Length: 1,276 mm (49.8 in)
• Width: 490 mm (19.1 in)
• Height: 735 mm (28.66 in)
• Dry weight: 149 kg (328 lbs)

Components
• Valvetrain: 1 inlet and 1 exhaust valve per cylinder, operated by push-rods and rockers
• Fuel system: 2 Sum down draught carburetters, automatic mixture control and suitable for
    inverted flight. Twin Bosch magnetos.
• Oil system: Fresh oil, metered for each cylinder. Rockers in oil bath.
• Cooling system: air

Performance
• Power output: 160 hp
• Compression ratio: 6:1


Sources:
Wikipedia

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