The C family was Mazda's first large piston engine design. It is not certain whether Mazda has a name for this collection of engines, and it is uncertain precisely which ones are related.
PC
The 985cc (1.0L; 60.1cuin)PC engine featured a 70mm ×64mm (2.76in ×2.52in) bore and stroke. It was an eight-valve SOHC design and was designed for rear wheel drivelongitudinal applications. The PC produced 45PS (33kW; 44hp) and 7kg⋅m (69N⋅m; 51lbf⋅ft) in the export market 323.
The 1,272cc (1.3L; 77.6cuin)TC had a 73mm ×76mm (2.87in ×2.99in) bore and stroke; a bored and stroked version of the PC. Used in the 1970, 1973, and 1977 Mazda Familia, and the 1979 – 1984 Mazda Bongo / Ford Econovans as the smaller engine option, the larger being the 1.6L Mazda NA engine. For 1977 a new, prize-winning lean burn version of the TC was developed for the new FA-series Familia, using a carburetor with an EGR valve.[1] Thus equipped, the TC weighs 127kg (280lb).[1]
1,415cc (1.4L; 86.3cuin)77mm ×76mm (3.03in ×2.99in) - A larger-bored version of the TC, used in the 1978–1980 Mazda GLC. Produced 70hp (52kW; 71PS). This was also used in the 1979–1984 E1400/Econovan and for the new 1984 Ford Econovan as the base model engine. In continental Europe the Econovan/Mazda E-series continued to use the UC engine until at least 1990, in a version which produces 48kW (65PS; 64hp).[3] In some parts documentations, it is referred to as the D4, however no UC engine block was ever stamped D4. in 1980, this engine (and the smaller TC) was modernized and turned into the new E-series engine, intended for front-wheel drive applications.
UB
The original 1966 Luce 1500 used a 1,490cc (1.5L; 90.9cuin) SOHC inline-four with square 78mm (3.07in) bore and stroke. This engine, also used in the Capella and Grand Familia for a short while, was replaced by the stroked NA engine (below).
The 1,586cc (1.6L; 96.8cuin) SOHC NA engine was a UB, stroked to 83mm (3.27in). JDM output was 100hp (75kW; 101PS) at 6000rpm, with maximum torque of 14kg⋅m (137N⋅m; 101lbf⋅ft) at 3500rpm. US-spec was 70hp (52kW; 71PS) at 5000rpm, with maximum torque of 11.3kg⋅m (111N⋅m; 82lbf⋅ft) at 3500rpm with a single Nikkei carburetor. The rest of the world received a 75hp (56kW; 76PS) version. Later on, this engine was also referred to as H6.
A stroked to 94mm (3.70in)1.8L (1,796cc) version of the UB/NA, retaining the same 78mm (3.07in) bore, was used in the 1968–1972 Luce 1800 and the 1975–1979 Mazda B1800s for the US market. In Canadian market B-series trucks, it was installed as early as 1970. Output for the 1972 Luce was 100PS (74kW; 99hp)JIS at 5500rpm and 15.5kg⋅m (152N⋅m; 112lbf⋅ft) at 3000rpm. Export model outputs varied, with European market models claiming 104hp (78kW; 105PS)DIN (all other figures remaining the same).[5]
↑Rex, Rainer, ed. (July 1989), Lastauto Omnibus Katalog 1990[Truck and bus catalog] (in German), vol.19, Motor-Presse-Verlag GmbH und Co. KG, p.153, 81531/89001