Plain 4 cylinder engines ranged from 1490 cc to 1586 cc and 1769 cc. See also this link.
The first Capella was introduced in 1970 and lasted until 1974. It was powered by a 4 cylinder SOHC valve engine displacing 1.6L (1586cc). Bore was 78mm and stroke was 83mm. Output was 104hp (77kW) and 106ft·lbf (144Nm).
This generation was sold in export markets as the Mazda 616 in coupe and sedan configurations.
An optional Mazda Wankel engine and other tweaks transformed it into the Mazda RX-2.
The 616 was a major component of Mazda's United States expansion in 1971, having been preceded by its rotary brother, the RX-2, the previous year. It featured the 1.6L (1586cc) engine, which was also used in the 1200 that year. The American Capella was updated and renamed the next year. The 1972 618 had a larger 1.8L (1796cc) engine. Lasting just one year, the 618 nameplate was not used again in the United States and the only Capella for 1973 was the RX-2.