Vehicle manufacturers will continue to integrate engine systems in the pursuit of smaller, more efficient units which emit fewer and less harmful toxins.
This has involved OE specialists such as Dayco developing solutions which bring systems together that traditionally have worked quite separately. An example of this can be seen on the BMW-PSA engine in the BMW Mini. The water pump is only activated when the temperature of the engine needs to be controlled. At start up, or when the engine is below its normal operating temperature, there’s no drive to the water pump so the engine warms up quickly with less emissions and lower fuel consumption. At normal temperature, it is engaged by the friction wheel, which receives its drive from the crankshaft pulley. The friction wheel is controlled by the ECU and uses an electric motor and reduction gear to position the friction wheel pulley.
Dayco has designed, developed and patented both the single-arm torsion bar tensioner, which replaces the traditional spiral spring tensioner and the motorised friction pulley, which drives the water pump on this engine. A range of 215 water pump kits are provided by Dayco and include an OE water pump along with the usual belt, tensioner and idler combination.