Mazda G engine

The G family of Mazda engines is a family of large straight-4 piston engines that was commercialized from 1989 to 2001. The series started at 2.6 L for the Mazda B-Series truck from 1988. Prior to that, a 2.6 L Mitsubishi engine had been used.

G54B

The 2.6 L Mazda G54B was actually a Mitsubishi engine. It displaced 2,555 cc and was used in the B2600 pickup from 1986-1988.

G6

Mazda replaced the G54B with its own 2.6 L G6 engine which displaced 2,606 cc. Bore and stroke are 92.0 mm and 98.0 mm. The G6 was produced until 1998.

Applications:

G5

The 2.5 L G5 was an evolution of the G6. It produces 102 hp (76 kW) at 4,000 rpm.

Applications:

GY

The GY is not at all related to the Mazda G-series 4 cylinder engines and is listed in this article strictly by engine code association. GY is the Mazda engine code for a 2.5 L (2,494 cc) Ford Duratec V6 engine which, due to an OEM deal with Ford, was built by Mazda in Japan for limited use in the 1999-2001 Mazda MPV. This Duratec V6 engine was in turn based off of the original Mazda KL 2.5 L (2,495 cc) from 1991. By the late 1990s during the Mazda/Ford partnership, Ford executives had ordered Mazda to cease development of V6 engines and instead focus on a new range of 4 cylinder engines for both companies' benefit, which would become the MZR/Duratec lineup of inline 4 cylinder engines. The order to discontinue their own V6 development included the Mazda K engine, leaving Mazda the only option of employing later Ford V6s, which were considerably cheaper to manufacture.