The story
In 1868, engineer Johan George Grönvall, also known as John G. Grönvall, founded a mechanical workshop and foundry in Skövde, Sweden. The company became limited in 1875, known as Sköfde Gjuteri och Mekaniska Verkstad or simply Gjuteriet. Products ranged from pots and vents to stoves and brewery equipment. Soon Gjuteriet also started manufacturing agricultural equipment and equipment for sawmills.
The company expanded heavily in the early 1900s, and started producing steam engines and water turbines for hydraulic power plants. In 1907, a very fruitful co-operation with the Stockholm-based engineering company Fritz Egnell began, with a one-cylinder 3 hp compression ignition engine. The engine was simply named B1 - but a five-man committee was set to find a name that would catch on. The committee failed to agree on a catchy name, but because it had five members, settled for Penta.
In 1916, Egnell bought the company and the name changed to AB Pentaverken. Production was concentrated on engines, mostly for maritime applications. The years immediately after World War I were economically harsh, but a new product was introduced: a small two cylinder U2 outboard engine designed by Carl-Axel Skärlund. The U2 was slightly improved in 1926, and renamed U21 and remained in production until 1962. The U2/U21 was a great success and exported worldwide. In many countries, U21 is still synonymous with outboard engine.
In 1925, Penta was approached by Assar Gabrielsson, the founder of Volvo, who needed an engine for the first Volvo automobile. Penta then designed the four cylinder 28 hp side valve Typ DA engine for the Volvo ÖV 4. In 1935, Penta became a subsidiary of Volvo.
From Wikipedia’s article on Volvo Penta, shared under CC BY-SA 4.0.4
