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Assar Gabrielsson was sales manager at SKF and together with the engineer Gustaf Larson, who had experience of the British automobile industry; he had decided to invest in a Swedish-built car. With its long experience of engine production, Pentaverken was given the chance to produce an engine - at a very reduced price - which was to have a displacement of two liters and an output of 28 horsepower. In 1927, a total of 710 DA engines were delivered to Volvo. In 1928 an additional 705 DA engines were delivered and, in 1929, 865 engines with the designations DB and EB were supplied in addition to 574 DA engines. A total of 2,854 DA, DB and EB car engines were manufactured between 1927 and 1930. Very quickly Volvo became an important customer that gave Pentaverken increased confidence and belief in the future.
Volvo business became more and more important for Penta and in 1935 Volvo bought its engine supplier and renamed the company Volvo Pentaverken. At the same time a design and sales department for non-automotive engines was set up in Goteborg under the name AB Pentaverken. The same year the Hesselman engine was introduced: a six-cylinder crude-oil engine with three-cylinder idling, a very advanced design for its time. Women were employed in the company for the first timeAt the start of the 1930s Fritz Egnell lost control of Pentaverken and Göteborgs Bank acquired a majority holding. Every year the company produced more Volvo engines than Penta engines, and Volvo's financial interest in Pentaverken increased. The production of marine, industrial and car engines under one roof, was no longer as smooth an operation as it had been in the beginning. Although time and motion studies and assembly-line production were introduced at an early stage - in 1930 - there were constant problems in the spring and summer which was the high season for Volvo and for other customers. Volvo was a demanding customer whose favors were being sought by many other Swedish companies and it was often necessary to work round the clock to complete its orders. In 1935, Volvo took over completely and the company was renamed Volvo Pentaverken. In the same year Volvo moved a design and sales department to Göteborg and set up AB Pentaverken in Göteborg, the company from which AB Volvo Penta developed.
