Cleaner and quieter diesels

To meet tightening regulation, engineers are tasked with adding more and more components and systems to take away more and more emissions.

Low-speed diesel engines may be efficient and robust, but they can be noisy. A new approach from a UK company is adapting a technology more commonly found in motorsports to provide a compact, inexpensive solution to a major source of acoustic emissions.

Diesel engine noise comes from a variety of sources, including vibration of the engine structure and gas flows in the exhaust and air-induction systems. Induction noise is particularly significant not only because its amplitude is high, but also because its frequency is low-typically dominated by engine firing frequency.