The Mazda J-family are a range of 60-degree V6 engines featuring a cast-iron cylinder block and alloy heads with belt-driven DOHC or SOHC. It is Mazda's only cast-iron gasoline V6. These engines are found in the Mazda H platform-based Mazda 929, Efini MS-9, and Mazda Luce; as well as the L platform Mazda MPV and S platform Mazda Bongo. It was built at the Miyoshi Plant in Miyoshi, Hiroshima, Japan.
The 2.0 L JF is a SOHC 12-valve longitudinally mounted V6. It has a bore of 74.0 mm and a stroke of 77.4 mm, and produces at 5000 rpm.
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The 2.0 L JF-T is a turbocharged variant of the JF engine. It has the same bore and stroke as the naturally aspirated JF, and produces at 5000 rpm.
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The JE is a SOHC 18 valve V6 used in the 1989-1998 Mazda MPV and 1988-1991 Mazda 929. It produces at 5500 rpm and of torque at 4000 rpm. A JE-ZE DOHC variant was in the 1990-1991 Mazda 929 S, as well as the 1992-1995 Mazda 929, producing at 6000 rpm. Both variants have a bore of 90.0 mm, and a stroke of 77.4 mm. In the US market, the DOHC engine saw a drop in power in the 1994-1995 Mazda 929 as a result of improved emissions equipment.
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The 2.5 L J5-DE is a DOHC motor with a bore of 82.7 mm and a stroke of 77.4 mm. It produces at 6000 rpm. When used by Kia in South Korea, the J5 engine claimed at 6,000 rpm.
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The 3.6 L J6-DE is a DOHC motor with a bore of 96.0 mm and a stroke of 83.0 mm, producing at 5,500 rpm. Its sole application was in the Kia Enterprise, and was discontinued after the 2001 model year. It was not available in any models marketed by Mazda. It was the largest displacement engine offered in the Korean market when introduced.
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