Depends on the design. Smokey got them past their limits and made them extra efficient: https://www.yellowbullet.com/threads/smokey-yunicks-hot-vapor-engine-why

Depends on the design. Smokey got them past their limits and made them extra efficient: https://www.yellowbullet.com/threads/smokey-yunicks-hot-vapor-engine-why-isnt-it-used-today.2552975/ https://www.yellowbullet.com/threads/smokey-yunicks-hot-vapo...