Otto’s 1876 four-stroke experimental engine. It made a whopping 3 hp at 180 rpm. This engine still exists, still runs, and can be viewed at the Deutz Museum in Cologne, Germany. Deutz AG
The company had just transitioned to Gasmotoren-Fabrik Deutz when this experimental diesel was built in 1898. It was the first diesel engine for the company and the first cross head diesel, meaning it had a multisection connecting rod. This system would be used in many large diesels for decades to come. Deutz AG