Technology
There are several forms of this engine.
The first is a non intercooled, mechanically controlled fuel injection system. This version is available in Rover 200 and Rover 400 models and the model designation ends in "D", i.e. SD, SLD etc., etc.
The second is intercooled and has an electronically controlled fuel injection system. This version is available in Rover 200, Rover 400 and Rover 600 models. The model designation ends in "Di", i.e. SDi, SLDi etc., etc.
The last and most recent engine is intercooled and also has an electronically controlled injection system which is slightly more advanced and produces more torque but the same power output as earlier intercooled models. This is the version that is used in the Rover 25, Rover 45, MG ZR, and MG ZS.
All versions use Bosch fuel injection equipment of various designs.
The engine is extremely environmentally friendly in terms of its emissions. It is quiet in operation owing to its two stage fuel injection & ECU controlling fuel for most models and timing for them all. The engine currently satisfies ECD IIl derogated Diesel emissions legislation when installed with an appropriate specified oxidation catalyst.
Sensors around the engine consistently give feedback to the ECU regarding injection timing, engine speed, load, fuel and coolant temperature, boost pressure etc. to ensure that optimum running conditions are maintained.
The basic engine is a conventional 4-cylinder with 2 valves per cylinder operated by a single overhead camshaft and hydraulic tappets.
The block is made of cast iron with aluminum alloy head and sump. An Allied Signal GT15 turbo charger supplies boosted air. A fully modulated, either air- or water-cooled exhaust gas recirculation (EGR) system is incorporated into the intake/exhaust system.
All accessories (PAS, aircon, water pump, vacuum pump, alternator) are all driven off a single poly-vee-belt drive with autotensioner. Camshaft and injection pump drives are via two multi-toothed belts with either automatic or manual tensioners.
Read more about this topic: Rover L-Series Engine
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