Sender: <marv@lancaironline.net> (Marvin Kaye)
To: flyrotary
Date: Wed, 23 Oct 2002 00:17:11 -0400
Message-ID: <redirect-1843042@logan.com>
From: Lehanover@aol.com
Subject: Re: [FlyRotary] Re: Scientific Inference,  Testing & AutoSpeedTest was  EWP p...
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In a message dated 10/22/2002 12:21:09 AM Eastern Daylight Time, 
canarder@starband.net writes:

> AMEN brother Leon !!!
>  That said :o) ... What are your thoughts around brother Tracy's notion
>  that controlling temperatures by lowering the pump output to pump less
>  coolant would result in higher temperature gradients from inlet to outlet
>  of the block?  One might intuit that the EWP is efficient enough to run at
>  capacity and still have efficiency advantages over stock system, so why
>  not either bypass coolant around the radiator or use cowl flaps for
>  coolant temp control.
>  Makes sense to me .... Jim S.
>  
I just cannot keep my mouth shut about this. All of the coolant going through 
my race engines, (about 245 HP at 9,400 RPM) must pass through a 5/8" 
restrictor.
The opening is in a flat aluminum plate welded over the end of the water 
outlet on top of the water pump. It (the outlet) happens to be off of a 
Spitfire, but could have been off of a Mazda. It makes no difference. The 
hole in the plate has sharp edges. From watching test pieces on the flow 
bench, I would suggest that it flows about as much as a radiused 1/2" hole or 
maybe a little less.  My empirical data suggests that the maximum flow rate 
of an unobstructed stock pump is maybe 4 times what is required to cool the 
engine at speed. It has to be so lest it not save the engine after a long 
pull at speed and a drop to idle speed for a long period. It has to move 
enough water past the hot spots at IDLE speeds or the engine would be ruined 
after the first run up over 100 MPH. And don't tell me you never had it over 
100. I know you better than that. I will not be amazed if the electric pump 
works. I will be amazed if it doesn't.
Lynn E. Hanover