Variants
| Model | Date | Works No. | Power | Notes | Notable uses |
|---|---|---|---|---|---|
| I | 1918 | 450 bhp at 1,950 rpm | geared, also related IA and 1AY | ||
| II | 1919 | E64 | 450 bhp at 2,000 rpm | ||
| IIII | experimental geared | Gloster Gorcock | |||
| V | 470 hp at 2,000 rpm 500 hp at 2,250 rpm |
VA had increased CR to 5.8 | Mainstay engine of the RAF in the late 1920s, replaced by Lion XI | ||
| VS | E79 | Turbocharged, intercooled | |||
| VIS | 1927 | Turbocharged | Gloster Guan | ||
| VII | 1925 | 700 bhp (racing) | Gloster III (Schneider Trophy entrant) Supermarine S.4 |
||
| VIIA | 1927 | E86 | 900 bhp (racing) | Golden Arrow Blue Bird (1927) Miss England I Supermarine S.5 Gloster IV |
|
| VIIB | 1927 | 875 bhp (racing) | geared | Supermarine S.5 Gloster IV |
|
| VIID | 1929 | E91 | 1,350 bhp at 3,600 rpm (racing) | Supercharged, about 6-8 built | Blue Bird (1931) Fred H Stewarts Enterprise Betty Carstairss Estelle V powerboat Miss Britain III Gloster VI (Schneider Trophy entrant) Railton Special (John Cobb's land speed record car) |
| VIII | 1927 | direct drive | Gloster Gorcock | ||
| XIA | 1928 | 580 bhp at 2,585 rpm, 6:1 CR | RAF production model | Napier-Railton | |
| Lioness | E71 | Inverted layout, for better visibility. At least some were built turbocharged, for racing. | |||
| Sea Lion | 1933 | 500/600 bhp | Marine version of Lion XI | British Power Boat Company Type Two 63 ft HSL |
Read more about this topic: Napier Lion
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