Electric water pumps (was) alt charging cont sw

[Bruce Plecan]

-----Original Message-----
From: Clive Apps Techno-Logicals 416 510 0020 <clive at problem.tantech.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, March 14, 1999 12:25 PM
Subject: Re: Electric water pumps (was) alt charging cont sw

OK, but a 1-2 HP electric motor is alot of weight, no?.
Then the waterpump coupling (mechanial/coolant), and pump itself.
Now a hydralic pump is another matter, since at low speed it's use could be
shared with the power steering, or for running a supercharger off of
hydralics.
Bruce

>> Think about how much motor/pump it takes to do 100 GPM....
>> (I'm guageing this on the 180 GPM Stewartcomponents mentions
>> at 9,000 rpm).
>> You might need 10-15 at idle..
>> Or am I missing something here
>> Bruce
>
>no pressure head
>it just moves the stuff around
>probably a lot of power is not required
>maybe 1-2 HP
>Clive
>> >But, isn't it inefficient to spin all those things at engine RPM rather
>> >than a constant RPM?  Seems like a pump/compressor that has to work over
>> >a 10:1 input speed ratio wouldn't be as efficient as one designed to
>> >work at a constant RPM.  Like A/C, and esp power steering.  If those
>> >were designed to run w/electric drive at constant RPM maybe they'd be
>> >more efficient.  Especially if you had a dual voltage alternator and ran
>> >the accessories at 100V 3phase.  maybe?
>> >--steve