They usually have a DOHC valvetrain configuration with hydraulic tappets, driving four valves per cylinder. Exceptions are the 1.4 12V unit, also with hydraulic tappets but a SOHC valvetrain, driving three valves per cylinder, and the 1.9 8V and 2.4 10V turbodiesels, with a SOHC valvetrain with mechanical tappets, driving two valves per cylinder. The 1750 TBi gasoline and 16V Multijet diesel engines feature hydraulic tappets with roller rocker arms. Some versions feature variable valve timing (VVT). The camshafts are belt-driven. In addition to VVT, some versions also feature variable-length intake manifold (VIS). Earlier Alfa Romeo versions use the Twin Spark ignition system. There is also a version of the four cylinder block using direct injection, used only in Alfa Romeo's vehicles, dubbed as JTS. In Brazil, the 5 cylinder petrol engines equipped the Marea sedan and break (Marea Weekend) lines between 1998 and 2006, including a 2.0 20V with deactivated VVT (125 PS) for lower taxation, 2.0 20V VVT (140 PS), 2.4 20V with VVT and VIS (157 PS) and a Turbocharged 2.0 20V (180 PS) detuned from the 220 PS version from Fiat Coupé. A slightly updated version of the 2.4 20V was also used on the Stilo Abarth with 165 PS.  ! Petrol units !Type !Vehicles !Diesel units !Type !Vehicles