Why Was the Rotary Engine Banned from Racing?

[KeeganLee]

Here are the reasons why the rotary engine was banned from racing: 1. High fuel consumption and pollution emissions: Although the rotary engine has a higher power output than reciprocating piston engines, its lower compression ratio prevents the complete combustion of the air-fuel mixture, resulting in poor fuel efficiency and high emissions. 2. Shorter engine lifespan: Due to the structural limitations of the rotary engine, sealing between chambers is achieved through apex seals. At high speeds, the contact surfaces between the apex seals and the chambers constantly change, leading to issues like gas leakage and poor lubrication conditions, which significantly reduce the engine's operational lifespan. 3. Automakers' interests: At the time, major automakers had already invested heavily in the development of reciprocating piston engines, which had significant potential for further advancement. Switching to the rotary engine, which had uncertain prospects and issues with fuel consumption, emissions, and durability, did not offer clear financial benefits.