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Question:

What is the difference between electrical/mechacal driven water pump?

looking for the comparison and then finaly the conclusion about the water pumps instaaled in the IC engines. Where we should stick to the tradional mechanical driven water pumps or electrical water pumps? which one is better!! any information/ response is appreciated

Answer:

Duh (I have to assume that IC = a engine (as fitted in a car) if there's no fan belt, how would YOU drive a water pump? I suggest the person that asked the question has PEDALS fitted to his/her IC the fan belt went when radiator fans had motors added (which was good as the fan was a unwanted load on the engine ...you only need a fan when stationary)
It is not always an either or as to choice of prime mover. I have seen small town water well pumps where availability was critical. They had the pump fitted with an electric motor for normal operation and a gas engine with a clutch to use if the motor failed.
Mechanically driven water pumps run off of a belt on the front of the engine to drive them where-as an electrical water pump is run by you guessed it electricity. Belt driven water pumps are much more common with electrically driven pumps usually used for high performance car so as not to rob horsepower from the engine by the force it requires to drive the pump.
The belt driven pump is operating all the time the engine is running. This takes some of the HP of the engine and causes wear and tear of the belt and the pump. The electric driven water pump is operated on demand from the water thermostat and only runs when the water temp. rises above the setting and shuts off again on returning to the setting. Saves engine HP and pump wear and tear...It's much more efficient.

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