Disclaimer: Yes, I know 3 cylinder Detroit Diesels are a thing. Still, a 4-stroke 3-cylinder diesel engine is a crazy piece of engineering for the late 30s.
A little background:
3Ro trucks were initially developed for the civilian market but found favor in the Italian military preceding WW2. They became the backbone of Italian logistics, being reliable, sturdy and fairly good off-road despite being 2WD. These were very valuable qualities for the North Africa campaign.
Unfortunately, video of them running and driving is nearly non-existent. If you’re curious what this strange beast could possibly sound like, [here’s a tractor fitted with a 3Ro engine.](https://youtu.be/d47Z68mHwYU) It’s certainly distinctive.
