Clessie's Engineering Partner

When Cummins Engine Company was in its infancy, founder Clessie Cummins knew that for the company to thrive it would need additional experienced engineering talent to turn his vision into reality. That talent arrived in the form of Hans L. Knudsen. 

Knudsen was a Danish engineer who had worked with a variety of companies and gained extensive experience with oil-engine design. He first came to Columbus in 1921, when he was sent by his employer, Rasmus Hvid, to help Cummins Engine Company with troubleshoot issues with the Cummins Hvid oil engine. Knudsen’s technical skill quickly caught Clessie’s attention. After some persuasion, Clessie managed to convince Knudsen to join Cummins as an engineer in January 1922. 

Knudsen immediately became essential to Cummins’ ongoing experimentation with diesel engines. Clessie and Knudsen worked side by side, constantly redesigning engines, tackling technical challenges, and refining fuel systems. 

Together, they tested thousands of fuel-injector variations, searching for the right combination of reliable combustion and dependable performance. Their persistence paid off with the introduction of the Model F in 1924. This engine established Cummins Engine Company as a serious player in the emerging diesel industry. 

Knudsen remained with the company for 26 years, retiring in 1948 around the same time as Clessie. Yet his contributions did not end there. As Clessie developed what would become the revolutionary Pressure-Time (PT) fuel system, he continued to seek Knudsen’s advice. It was a fitting continuation of a partnership that had helped launch Cummins’ earliest successes and that continued to influence some of the company’s most important engineering innovations.

Knudsen's final visit to Columbus came in May 1971, when he toured the newly opened Cummins Technical Center. The facility stood as a testament to how far the company had come since his arrival in 1921 and to the generations of engineers who continued the tradition of innovation he helped create.