The Siniai was powered by two 500 hp Siddeley Tiger water cooled engines, a new V-12 design produced by combining two straight-6 Siddeley Pumas onto a single crankshaft.
Hawker Siddeley | Puma SE | Hawker Siddeley Harrier | Hawker Siddeley HS 748 | Aérospatiale SA 330 Puma | Siddeley Puma | Siddeley-Deasy | Hawker Siddeley Trident | Eurocopter AS332 Super Puma | Armstrong Siddeley | Siddeley Tiger | Puma Energy | Hawker Siddeley Andover | Siddeley-Deasy Siniai | John Siddeley, 1st Baron Kenilworth | Bristol Siddeley Orpheus | Armstrong Siddeley Panther |
Bristol Tourers were delivered with a variety of engines, subject to availability and customer desires; these included the Rolls-Royce Falcon, Siddeley Puma, Hispano-Suiza 8, and Wolseley Viper.