Mazda Familia Second Generation Rotary Coupe 10A Rotary Engine

The Familia Rotary Coupe’s 10A

The 10A was the two-rotor engine fitted to the second-generation Familia Rotary Coupe, introduced in July 1968. It extended Mazda’s rotary programme beyond the Cosmo Sport into the Familia passenger-car range. Mazda identifies this application as 491 cc × 2, developing 100 PS. This record covers the coupe installation rather than every vehicle using the 10A engine family. Mazda’s Familia history identifies the export car as the R100.

Capacity and output

Mazda’s Japanese corporate chronology specifies two rotors of 491 cc each and maximum power of 100 PS at 7,000 rpm, gross. Adding the two stated rotor capacities gives 982 cc; retaining the manufacturer’s 491 cc × 2 notation makes the rotary configuration explicit.

The gross qualification belongs with the power figure. It should not be relabelled as net horsepower or treated as a universal specification for every export market. The cited chronology does not identify a more specific test standard. See Mazda’s July 1968 entry.

Application and chronology

The second-generation Familia preceded the rotary coupe: the generation arrived in November 1967, followed by the coupe in July 1968. These are calendar introduction dates, not export model-year designations.

Mazda Collection dates the Familia Rotary Coupe to 1968–1973. That range describes the vehicle application; it does not establish the manufacturing dates of every 10A engine. Mazda Collection’s rotary coupe history also describes its engine as derived from the Cosmo Sport’s 10A.

Mazda’s Japanese Familia history records the separate four-door Rotary SS in July 1969 and the consolidation of rotary models into the Familia Presto Rotary series in April 1970. Those developments provide context without turning the sedan into a coupe specification. See Mazda’s second-generation history.

Export engineering

The coupe was exported as the Mazda R100. Mazda’s account connects its North American entry with the development of a thermal reactor to treat hydrocarbon emissions, an important engineering issue for the rotary programme. This establishes the relevance of exhaust treatment to export development without implying identical emissions equipment or output ratings in every market. Mazda’s Familia history supplies this context.

Competition and historical significance

The Familia installation helped carry Mazda’s rotary identity into a broader passenger-car line. Mazda records a Singapore Grand Prix victory for the Rotary Coupe in 1969, followed by competition appearances in Europe and South Africa. These competition achievements do not establish the output of a standard road engine. See Mazda’s retrospective.

The FIA lists the Japanese, rear-wheel-drive Familia Rotary Coupe M10A under Group 2 homologation number 1541. Its database gives a capacity entry of 1,964, distinct from Mazda’s 491 cc × 2 engine notation. The competition entry should not replace the manufacturer’s stated rotor capacity. Likewise, its November 1968 homologation date and January 1979 expiry are administrative dates, not the vehicle’s production boundaries. See the FIA homologation record.

Scope of the evidence

The references establish the Japanese application, introduction, rotor capacity and gross power rating. They do not establish an engine assembly plant, exact engine production end date or a complete specification for each export market. Those details remain unspecified here. The 1968–1973 vehicle range is not presented as the production span of the entire 10A family.