The 2.0*L (1991*cm3) FS has an 83*mm bore and 92*mm stroke and produces 116*hp and (88*kW) and 135*ftlbf (183*Nm) in its most common variant up to 170*hp in the Japanese Domestic Market. In 1998 the engine evolved into the FS-DE by undergoing several changes, most notably a distributorless ignition as well as the move from hydraulic lifters to solid shim-on-bucket lifters. Japan received a higher-performance 170*hp version, known as the FS-ZE. Mazdaspeed decided to turbocharge the regular FS-DE, as the FS-DET in 2003 for the Mazdaspeed Proteg and it generated 170*hp (127*kW) and 160*ftlbf (217*Nm), the same hp rating as the naturally-aspirated JDM FS-ZE but with a sharper torque curve. This means that the Mazdaspeed Proteg's engine is internally identical to the regular FS-DE, except with a turbocharger installed onto it.
The updated FS-DE engine did enjoy a few minor technical features, such as:
-Oil Squirters
-VICS (Variable Inertial Charge System) - A system that can vary the volume of the intake manifold resulting in a broader power band. There were known issues with this system, the most noteworthy was a defect which allowed screws that secured the VICS butterfly valves to come loose and end up being sucked into the engine. Some engines had to be replaced entirely due to the extent of the damage caused. [1]
-VTCS (Variable Tumble Control System) - A set of butterflies in the intake manifold that would close to promote low emissions combustion under cold start at low engine speeds. These had a reputation of being noisy at times.
-Windage Tray
Applications:
1993–2002 Mazda 626
1993–1997 Mazda MX-6
1999–2001 Mazda MPV (Japan)
1999–2003 Mazda Capella
2001–2003 Mazda Protg
1993–1997 Ford Probe
