Efficiency aside, big two-stroke engines, particularly diesels, tend to have a very distinctive sound. I guess this one, being also two-stroke and compression ignition, would probably sound somewhat like this:<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=mkH9QRaQJM0" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=mkH9QRaQJM0</a><p>Even if they weren&#x27;t all that much more efficient, I bet a lot of people who miss the 2-stroke diesel sound would want one in their car.