[Healeys] electrc fan vs. belt drive

[Oudesluys]

I just see I made a mistake, I ment an electrical water pump or fan. 
Sorry for the confusion. Degeneration of the gray cells I am afraid.
I just want to keep it simple. Anyway the efficiency of electromotors 
and dynamo/alternators are fairly high (around 80-90%), so for ease keep 
them at 100%. Things automotive from the 50's ae not very accurate anyhow.
Kees Oudesluijs


Eric (Rick) Wilkins schreef:
> Not that simple math.
>
> There is the efficiency of each item to be considered. You can run the 
> water pump from a battery for maximum HP, but an alternator may/may 
> not use more mechanical energy than your belt driven pump. Also, once 
> the pump is removed you are reducing the engine from driving an 
> alternator AND a pump, to just a an alternator.
>
> Wilko
>
> On Feb 3, 2009, at 2:20 AM, Oudesluys wrote:
>
>> A water pump and a mechanical fan need a fair amount of power to be 
>> driven. They are not perpetu|m mobilae, so that power needs to come 
>> from somewhere: ultimately the engine, and it does not make any 
>> difference if that is through the alternator/dynamo and battery. So 
>> the power needed for the alternator that will feed the battery and 
>> powers the water pump will not be available to drive the wheels. 
>> Simple mathematics.
>> Kees Oudesluijs