Mazda Wankel engine – 12A – Encyclopedia II | Global Oneness

3 Nov 2014 | Author: | Comments Off on Mazda Wankel engine – 12A – Encyclopedia II | Global Oneness
Mazda Luce

Mazda Wankel engine 12A – Encyclopedia II

The 12A was a bored-out of the 10A – the rotor diameter was the but the depth was increased by 10#160;mm to 70#160;mm (2.8#160;in). Each of its two displaced 573#160;cc for a total of The 12A series was produced for 15 years, May 1970 through 1985.

In 1974, a 12A became the first built outside of western or the U.S to finish the 24 hours of Le Mans.

In a new process was used to harden the housing. The Sheet-metal Insert (SIP) used a sheet of much like a conventional engine cylinder liner a chrome plated surface. The housing coating was also to eliminate the troublesome sprayed

The new REST process created a strong housing, the old carbon could be abandoned in favor of cast iron.

Early 12A also feature a thermal similar to the 0866 10A, and use an exhaust port insert to exhaust noise. A lean-burn was introduced in 1979 (in Japan) and (in America) which substituted a catalytic converter for this A major modification of the 12A architecture was the 6PI featured variable induction


1970-1972 Mazda

1970-1974 Mazda RX-2, (97#160;kW) and 115#160;ft.lbf (156#160;Nm)

Mazda RX-3 (Japan), (82#160;kW) and 100#160;ft.lbf (135#160;Nm)

Mazda RX-4

1972-1980 Mazda Luce

Mazda RX-7, 100#160;hp


1979-1985 Mazda (Japan)

1980-1985 Mazda (USA)


1981-1985 Mazda

Mazda Luce

1981-1985 Mazda Cosmo

Mazda Wankel engine Turbo

The ultimate 12A engine was the and fuel injected engine in the Japan-spec Cosmo, Luce, and It featured semi-direct injection both rotors at once, a that was much more than it would appear. A knock sensor was used to detonation, and later models a specially-designed impact turbo was tweaked for the unique exhaust of the Wankel engine.

Output was 165#160;hp (123#160;kW) at and 186#160;Nm (137#160;ft.lbf) at 4000#160;RPM.

1982-1985 Mazda Cosmo

Mazda Luce

1984-1985 RX-7

Adapted from the article 12A, under the G.N U Docmentation License. Please see

Mazda Luce
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