- BL S-Series engine
The S-Series is a
Straight-4 SOHC internal combustion engine developed by theAustin Rover Group (subsidiary ofBritish Leyland ), and introduced in 1984 in both theAustin Montego and the Mark 1Rover 200-series . It was also used in theAustin Maestro from 1985 onwards.The engine comes from the same lineage as the BMC-developed E-Series family introduced in the 1969
Austin Maxi , but with important modifications in order to facilitate compatibility with a conventional "end-on" transmission unit, in place of BMC/BL's traditional "gearbox-in-sump" configuration for itsfront wheel drive vehicles. The gearbox flange was redesigned to accept either aVolkswagen manual gearbox (for the Maestro/Montego), or theHonda PG-1 transmission (for the Rover 200).BL had also developed the earlier R-Series engine from the E-Series family, but largely as a stopgap at the Maestro's launch since the S-Series was not yet ready for production. Because the E-Series had to be turned through 180 degrees in order to facilitate an end-on transmission, the resultant R-Series unit had the inlet manifold on the front facing side of the
cylinder head , something which proved fatal for the engine's reliability—since it opened the door forcarburettor icing. The S-Series solved this problem, as the inlet manifold was now on the rear face of the engine. Another important advance over the E-/R-Series was the adoption of a camshaft driven by a toothed belt in place of the previous timing chain system.Production of the S-Series engine continued until the end of Montego / Maestro series production in 1993, the remaining cars which were built by Rover until 1994 used only the O-Series
diesel engine .A 4-valve version of the S-Series was under development alongside the 1100 cc and 1400 cc K-Series engines. However, the project was abandoned when a redesign of the K-Series allowed its capacity to be stretched to 1600 cc and 1800 cc.
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