Confusingly, Mazda also sells Ford's SigmaZetec (which is unrelated to both the Zeta and Mazda Z family) as the MZI. The MZ-CDDiesel is also unrelated to the rest of the Z family.
The Z5/ZL, Z6/ZM, and MZR are DOHC 16-valve water-cooled engines.
The 1.6 L (1598 cc) (78x83.6 mm) Z6/M was used in the 1999+ Mazda Protegé.
MZR
The versatile MZR is Mazda's latest Straight-4 engine. Development was assisted by Ford, who also sell the engine as the Duratec 23. The MZR family features a special long intake manifold for added torque, S-VT continuous variable valve timing, and a stainless steel 4:1 exhaust header.
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Mazda's new MZR in-line four-cylinder petrol engine range powers Mazda's new generation cars, and is currently employed in the Mazda6, the Mazda2 and the latest model, the Mazda3.
The entire MZRengine range, however, has been designed to meet even tougher emission standards on the horizon and the 2.0-liter PZEV engine will be so clean-running that it meets the PZEV regulations adopted by the Green States in the US.
The base MZRengines also employ shape-modified, lightweight pistons and low-friction piston rings, and shimless tappets with a low frictional coefficient finish, all of which reduces friction and improves fuel economy for less CO emissions.
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