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Message: <blockquote data-quote="sakuraguy" data-source="post: 1628171" data-attributes="member: 6441">13AThe 13A was designed especially for front wheel drive applications. It had two 655 cc rotors for a total of 1310 cc. This was the only production Mazda Wankel with different rotor dimensions: Diameter was 120 mm (4.7 in) and offset was 17.5 mm (0.7 in), but depth remained the same as the 10A at 60 mm (2.4 in). Another major difference from the previous engines was the integrated water-cooled oil cooler.The 13A was used only in the 1969-1972 R130 Luce, where it produced 126 hp (94 kW) and 126 ft.lbf (172 Nm). This was the end of the line for this engine design: The next Luce was rear wheel drive and Mazda never again made a front wheel drive rotary vehicle.Applications:1970-1972 Mazda R13012AThe 12A was a "bored-out" version of the 10A - the rotor diameter was the same, but the depth was increased by 10 mm (0.4 in) to 70 mm (2.8 in). Each of its two rotors displaced 573 cc for a total of 1146 cc. The 12A series was produced for 15 years, from May 1970 through 1985. In 1974, a 12A became the first engine built outside of western Europe or the U.S to finish the 24 hours of Le Mans.In 1974, a new process was used to harden the rotor housing. The Sheet-metal Insert Process (SIP) used a sheet of steel much like a conventional piston engine cylinder liner with a chrome plated surface. The side housing coating was also changed to eliminate the troublesome sprayed metal. The new "REST" process created such a strong housing, the old carbon seals could be abandoned in favor of conventional cast iron.Early 12A engines also feature a thermal reactor, similar to the 0866 10A, and some use an exhaust port insert to reduce exhaust noise. A lean-burn version was introduced in 1979 (in Japan) and 1980 (in America) which substituted a more-conventional catalytic converter for this "afterburner". A major modification of the 12A architecture was the 6PI which featured variable induction ports.Applications:1970-1972 Mazda R100 1970-1974 Mazda RX-2, 130 hp (97 kW) and 115 ft.lbf (156 Nm) 1972-1974 Mazda RX-3 (Japan), 110 hp (82 kW) and 100 ft.lbf (135 Nm) 1972-1974 Mazda RX-4 1972-1980 Mazda Luce 1978-1979 Mazda RX-7, 100 hp (75 kW) Lean-burn 1979-1985 Mazda RX-7 (Japan) 1980-1985 Mazda RX-7 (USA) 6PI 1981-1985 Mazda Luce 1981-1985 Mazda CosmoTurboThe ultimate 12A engine was the turbocharged and fuel injected engine used in the Japan-spec Cosmo, Luce, and RX-7. It featured "semi-direct injection" into both rotors at once, a technique that was much more successful than it would appear. A passive knock sensor was used to eliminate detonation, and later models featured a specially-designed "impact turbo" which was tweaked for the unique exhaust signature of the Wankel engine.Output was 165 hp (123 kW) at 6000 RPM and 186 Nm (137 ft.lbf) at 4000 RPM.Applications:1982-1985 Mazda Cosmo 1982-1985 Mazda Luce 1984-1985 Mazda RX-7 12BThe improved 12B was quietly introduced in 1974. In the US it was the start of the single distributors engines.NOTE: the previous 12A & 10A engines used the twin distributors.Applications:1974-1978 Mazda RX-2 1974-1978 Mazda RX-3</blockquote>

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