There was also lean-burn version introduced in August 1995 this model produces 94 PS (69 kW 93 hp) and sees gas mileage improvements of ten to fifteen percent in the standard Japanese test cycle. The cylinder head was a compact design with round intake and exhaust ports. The block is cast iron, the oil-pan is a 2-piece design with an upper aluminum and lower stamped steel, piston oil squirters are standard. Early versions of this motor had a chain driven exhaust cam. The Z series was a new design based on the B-series block, block internals and oil-pan and a different DOHC head. The Z5 engine was introduced as the first of a newer line of Mazda Z-series engines. From here on in, Mazda moved on to the full SkyActiv architecture vehicles including running only the aforementioned SkyActiv G-engine but now offering it in also larger displacements, as well as a new SkyActiv D-engine turbo-diesel. Production was finally halted in 2014, being the last year of the Demio/Mazda2, Verisa as well as Axela/Mazda3 of their generations. In 2011, Mazda started to introduce the SkyActiv G-engine as a new, more economical option with vehicles that also ran the Mazda Z-engine. The block features split upper and lower block assembly for added strength and rigidity, special long intake manifold for added torque, S-VT continuous variable valve timing, and a stainless steel 4:1 exhaust header. Other Z engines have aluminum alloy block and head, with cast-iron cylinder liners. The block of the 98-02 Z5, ZM and ZL engine is cast iron same as the earlier B series of engines. The Z-engine has 16-valves operated by dual overhead camshafts, which are in turn driven by a timing chain (ZJ/Z6/ZY only). They are the evolution of the cast-iron block B-engine. The Mazda Z-series is a smaller gasoline inline-four engine ranging in displacements from 1.3 L to 1.6 L.
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