The Siddeley Puma is a British aero engine developed towards the end of World War I and produced by Siddeley-Deasy.

[3] In wartime British military service, versions of the engine built by Siddeley-Deasy and Galloway were both known as the 230 hp BHP although they had different dimensions and few interchangeable parts.

Steel sleeves, open at both ends, are screwed into an aluminium casting which forms the heads for three cylinders and the inlet manifold.

A separate aluminium water jacket surrounds the cylinder barrels and is bolted to the head casting and made tight at the bottom by annular nuts screwed against rubber glands.

[6] Rods were stamped with part numbers and inspection marks that created weak points leading to crack propagation which likely contributed to the type's poor service reliability.

After a complete overhaul, and some safety related modifications, the engine was used to power the company's restored Airco DH.9.

[10] Preserved examples of the Siddeley Puma are on display at the following museums: Data from Lumsden[11] Related development