From 1966 onwards, he built his own engine, the Casal engine, a modified copy of the Zündapp engine, which was to be built in many variants. In the 1970s, Casal exported its products to the UK, the US, the Netherlands, Denmark, Sweden, and other countries. Car production was also planned but never realized.
Casal had always been involved in 50cc racing with the Dutch company HuVo, but in 1980-81 they set several world records with Dutch riders. In 1980, Jan Nijhuys set the 50cc 1/4-mile standing start record in 15.26 seconds with a Casal Sparta Plompen. Then, in 1981, Jan Huberts drove the HuVo Casal 50cc streamliner to an astonishing 224 km/h (139 mph).
