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All DTM race cars have RWD and 4.0-litre V8 engines (later 2.0-litre inline-4 turbocharged engines) which are air-restricted to 460 hp but now into over 500 hp since 2017 until 2018 season and now into 610 hp including 30 hp push-to-pass since 2019 season and later 580 hp + 60 hp push-to-pass since 2020 season onwards, no matter if similar ...
The compression stroke is intended to compress the products before the flame ignites the mixture. If the compression ratio is increased, the mixture may auto-ignite before the compression stroke is complete, leading to "engine knocking". This can damage engine components and will decrease the brake horsepower of the engine.
Albert Betz at the Mathematics Genealogy Project; History of Aviation website Archived 2018-05-29 at the Wayback Machine includes images of Betz, Prandtl and their work.; Betz' book on hydrodynamics and aerodynamics, "Vier Abhandlungen zur Hydrodynamik und Aerodynamik", The Keiser Wilhelm Institute for Study of Fluid Flow, 1927 (German) on Google books.