0 a device which produces more power in an engine by forcing more air into the part of it in which fuel burns -- 增压器
It is a combination of an exhaust-driven turbocharger and an engine-driven supercharger, each mitigating the weaknesses of the other.
Both prototypes were research aircraft, used for testing pressurized cabins, engine superchargers, and cantilever wings.
This coupled with engine oil spray out of the valve cover breathers because of the pressure of the superchargers.
Turbochargers and superchargers are both engine-driven air compressors (exhaust-driven or mechanically-driven, respectively) and provide varying levels of "boost" according to engine rpm, load etc.
For 1949, the engine was further modified with dual overhead camshafts (though still two valves per cylinder) and a two-stage supercharger.
A central gear tower drove the overhead camshafts, superchargers and ancillaries.
It also produces full tuned cars including: reworked suspension, tuned engines with turbochargers, superchargers and so on.
It was late with front-wheel brakes, late with superchargers, late with self-starters, and late in every single thing.