The Bristol Neptune was a seven-cylinder air-cooled radial engine developed in 1930.

It had the same size cylinders as the earlier Mercury and Titan engines, 5.75 in (146 mm) x 6.5 in (165 mm) which gave a displacement of 1,182 cu in (19.3 L) and produced a maximum of 320 horsepower (239 kW).

The Neptune was effectively a seven-cylinder version of the Titan.

[1] Data from Lumsden.

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