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SportTrac Discussion
Engine & Drivetrain
Flex a Lite Black Magic post install review
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<blockquote data-quote="Richard L" data-source="post: 584606" data-attributes="member: 52972"><p>Fast Eddie,</p><p></p><p>A Flex-Lite fan is not electric, it is a variable pitch fan driven by the engine just like the original engine fan.</p><p></p><p></p><p></p><p>All engine driven fans have a parasitic drag that eats up HP. The general rule of thumb is that the fan will require 5-8 HP. A thermostatic electric fan has no parasitic drag since it is not driven by the engine, and only operates when the coolant temperature is high, typically while idling at a traffic light or driving at low speeds (20-25 MPH) in heavy traffic.</p><p></p><p></p><p></p><p>Once you are moving at 30+ MPH the air flow through the radiator is sufficient to cool the engine and the electric fan shuts off. A thermostaticly controlled fan may disengage, however there is still sufficient drag to steal HP from the engine </p><p></p><p></p><p></p><p>If you don't believe that, just start your engine on a cold day and you will notice that your fan is turning as fast as the engine. If you increase the engine RPMs the fan will also increase in speed. The engine is cold and has no need for the cooling fan, and the fan clutch is disengaged, however it continues to spin because there is still a dignificant amount of drag occuring and that is robbing the engine of HP.</p><p></p><p></p><p></p><p>...Rich</p></blockquote><p></p>
[QUOTE="Richard L, post: 584606, member: 52972"] Fast Eddie, A Flex-Lite fan is not electric, it is a variable pitch fan driven by the engine just like the original engine fan. All engine driven fans have a parasitic drag that eats up HP. The general rule of thumb is that the fan will require 5-8 HP. A thermostatic electric fan has no parasitic drag since it is not driven by the engine, and only operates when the coolant temperature is high, typically while idling at a traffic light or driving at low speeds (20-25 MPH) in heavy traffic. Once you are moving at 30+ MPH the air flow through the radiator is sufficient to cool the engine and the electric fan shuts off. A thermostaticly controlled fan may disengage, however there is still sufficient drag to steal HP from the engine If you don't believe that, just start your engine on a cold day and you will notice that your fan is turning as fast as the engine. If you increase the engine RPMs the fan will also increase in speed. The engine is cold and has no need for the cooling fan, and the fan clutch is disengaged, however it continues to spin because there is still a dignificant amount of drag occuring and that is robbing the engine of HP. ...Rich [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Flex a Lite Black Magic post install review
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