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Message: <blockquote data-quote="t2ribena" data-source="post: 601637" data-attributes="member: 3847">care to elaborate more on the losses you are referring to on the electrical energy used to power the fan vs the mechanical loss that you claim that it has lesser energy loss?as mentioned earlier, parasitic drag from viscous coupled mechanical fan contributed to loss of energy, like all viscous coupling system, the system is not 100% efficient due to the slippage or partial engagement of the coupling...electric fan does not have this loss as it is a direct drive system...apart from the parasitic drag on viscous coupled mechanical fan, the drag created by each blade in order to push/displaces the air creates significant 'unwanted' load on the engine...as the density of the air increases as the blade pushes it at higher speed, in this case as you rev your engine higher, the factor of the drag increases exponentially...to avoid this that is why the engineers opt for the electric fan, yes it loads but on the electrical circuit whereby when a higher rating alternator is used, this does not directly loads on the engine...in electrical system when you have sufficient current in the supply system, and the loads are within this supply current limits, you are not creating any loss of power to other circuit powering for example the spark systems and etc...</blockquote>