Electric water pumps (was) alt charging cont sw

[Bruce Plecan]

-----Original Message-----
From: steve ravet <steve.ravet at arm.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Sunday, March 14, 1999 11:32 AM
Subject: Re: Electric water pumps (was) alt charging cont sw


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
>
>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