The G family of Mazda engines is a family of large inline-four 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.
The 2.6 L Mazda G54B was actually a Mitsubishi engine. It displaces 2.6 L (2,555 cc) and was used in the B2600 pickup from 1986 to 1988, until Mazda developed their own suitable engine.
Mazda replaced the G54B with its own 2.6 L G6 engine which displaces 2.6 L (2,606 cc). Bore and stroke are 92 mm × 98 mm (3.62 in × 3.86 in). The G6 was produced until 1993 and made 121 hp (90 kW), 149 lb⋅ft (202 N⋅m) for North American models. The G6E which replaced it was used in other markets around the world.
Compression Ratio: 8.4
Valve train: 12V SOHC
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The 2.5 L G5 was an evolution of the G6. It produces 102 hp (76 kW; 103 PS) at 4000 rpm.
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The GY is not at all related to the Mazda G-series four-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 on 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 four-cylinder engines for both companies' benefit, which would become the MZR/Duratec lineup of inline-four 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.
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