The Nakajima Ha219 (also known as the Ha-44 under the unified designation system, BH by the company and NK11A by the Imperial Japanese Navy Air Service (IJNAS)), was a late war Imperial Japanese Army Air Force (IJAAF) 2,461 hp (1,835 kW) 18-cylinder air-cooled radial engine, used on the Tachikawa Ki-94-II, Nakajima Ki-84-N and Nakajima Ki-87.
Data from: Japanese Aero-Engines 1910-1945[1] A total of around 10 engines were built, but the engine suffered from over-heating at low speeds and required large amounts of maintenance.
Around 7 were issued to the Kitai squadron in late 1945 and used on the new Ki-84-N, lacking the supercharger installed on the Ki-94-2 and Ki-87.
most are believed to have been scrapped or destroyed after the war along with documentation.
Data from Japanese Aero-Engines 1910-1945[1]