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Hirth HM 508
The Hirth HM 508 was an air-cooled, eight-cylinder, 60° cylinder bank angle inverted-V aircraft engine built in Germany in the 1930s. It had a bore and stroke of 105 mm × 115 mm (4.1 in × 4.5 in) and developed 210 kW (280 hp) at 3,000 rpm.

General characteristics (HM 508D)
• Type: Eight-cylinder 60-degree inverted V inline engine
• Bore: 105 mm
• Stroke: 115 mm
• Displacement: 7.97 L
• Length: 1,289 mm
• Width: 683 mm
• Height: 815 mm
• Dry weight: 208 kg

Performance
• Power output: 280 hp at 3,000 rpm
• Compression ratio: 6:1

Applications:
– Ambrosini S.7
– Heinkel He 116
– IMAM Ro.63
 – Messerschmitt Bf 108
– Siebel Si 104
Sources:
Wikipedia
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