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viscous clutch
Established in 1995, China Sujie Auto Parts Co., Ltd. is a professional viscous clutch manufacturer, sale and research of auto parts and vehicle components. It has years of OES and OEM viscous clutches production experiences and passed ISO9000 and the TUV certification of ISO/TS16949 quality system. we can provide our customers with high quality auto parts and qualified vehicle components for many kinds of cars such as Ford, Opel, Benz, BMW, Nissan, Toyota, Mitsubishi, Mazda, Isuzu, Hyundai, Kia and Truck series.
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viscous clutch
Upgrade Your On/Off or Viscous Fan Clutch Retro Fit with a LINNIG 2 Speed Fan Clutch The Rover SD1 Efi Viscous Fan Coupling (Clutch Fan) uses the unique properties of a silicone oil whose viscosity changes both with sheer force and temperature. A grooved wheel (fixed to the water pump) rotates within a grooved housing (fixed to fan blades) and the oil is forced to move within and between the revolving grooves. The larger the speed differential between oil layers in the wheel and housing the greater the sheer forces which raise the temperature and viscosity of the oil. The increased bond between the two causes the fan to rotate faster increasing airflow through the radiator. As speed difference falls, sheer forces and oil temperature fall, the oil gets thinner, the driving force lessens and fan speed stabilises. For Efi cars a forward facing bimetal coil senses the airflow coming from the radiator. Heat causes the coil to turn a shaft which operates an internal control valve regulating the volume of oil which is able to flow between the grooves. Thus hotter air allows more fluid to enter the grooves resulting in a stronger bond between wheel and housing giving higher fan speed and increased cooling.

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viscous clutches
When you push your powerplant, thermodynamics pushes right back. The toll of high performance is higher heat load ĘC and many stock components begin to complain. This upgraded fan clutch increases viscous coupling of cooling fan blade speed to water pump speed, yielding increased airflow through the radiator for more efficient cooling. A simple, yet wonderful, thing. A new new viscous coupling costs loads of money and finding a good used item depends upon assurance from the seller or trying it out in situ before agreeing to buy. It is possible to adapt a unit commonly used by BMW to fit the Efi fan blades by redrilling the fixing holes taking care to avoid vibration. Alternatively a thermostatically controlled electric fan is cheaper, can be independently switched and absorbs no power when off. However, under-bonnet temperature may vary wildly which is bad for Efi systems and, unless fully cowled, will be have less overall efficiency.


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