A Soviet modification of the American Cyclone engine, produced under licence in Poland.
The engine was designed by a team led by Arkady Dmitriyevich Shvetsov, based on the American Wright R-1820 Cyclone engine, produced from 1932 in the USSR under the designation M-25. The improved M-62 (with, among other things, redesigned intake ports, increased compression ratio and a modified supercharger) appeared in 1937 and was produced in large numbers for military and civil aviation. In 1941 the designation was changed to ASh-62. As a result of post-World War II work on increasing engine reliability and extending service life through technological improvements, the ASh-62IR version was developed.
From 1961 to the present day, this engine has been series-produced under licence at WSK PZL-Kalisz, where it continues to undergo further development. Modified versions with increased power carry the designations K9-AA, K9-BA and K9-BB. The ASh-62 and K-9 engines have been used in the Li-2, An-2 and PZL M-18 Dromader aircraft.
| Configuration | 9-cylinder radial |
| Cooling | air |
| Compression ratio | 6.4 |
| Displacement | 29.9 l |
| Propeller reduction | 0.687 |
| Weight | 567 kg |
| Maximum power | 1000 hp at 2200 rpm |
| Rated power | 840 hp at 2100 rpm |
