China to start upgrading J-20 fighter engines in bid to close gap with US F-22

China will start upgrading the engines of its most advanced stealth fighter jet, the J-20, this year to bring its performance closer to the American F-22 Raptor, according to a military source.

The performance of the fighter, also known as the Mighty Dragon, had been limited because it has been using a stopgap engine, the WS-10C, the latest model of an engine used in earlier Chinese warplanes.