Another Mazda rotary engine innovation is using an auxiliary intake port valve that can swivel open to increase the amount of air during the intake phase when required for more power at higher RPMs.

On Jan. 8, 2024, a fire broke out in the engine room aboard the cargo ... Six weeks before the fire, a replacement valve was ordered for the ship’s port double bottom diesel oil, or DBDO ...

While the poppet valves work well at low speeds, they are unreliable at high engine speeds ... The opening from the carburetor through the inlet port into the cylinder is a rapidly increasing ...