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Re: Electric cooling fans - THANKS!

To: Jack Brooks <brooks@belcotech.com>, Gerhard.Wiederholl@t-online.de, OddHedberg <odd@triumphclub.se>, "TR-Power British, Brian Schlorff" <britcars@powerbritish.com>
Subject: Re: Electric cooling fans - THANKS!
From: Glen Murdoch <glen.murdoch@gat.com>
Date: Tue, 02 Feb 1999 09:36:13 -0800
Cc: Triumph List <Triumphs@autox.team.net>
Jack,

If you are looking for a possible dual fan check out the Flex-a-lite model
made for a Scirocco.  The part number is 365.  The fan reqires a mounting
surface of 18.5" x 13" x 2.75".

You can check it out at 

www.flex-a-lite.com/auto/scirocco.htm

Best of luck

Glen
TS31825

At 12:22 PM 2/2/99 -0500, Jack Brooks wrote:
>
>Brian Schlorff, Gerhard Weiderholl and Odd Hedberg
>
>Thanks.  I greatly appreciate the information.  In view of the discussions,
>it does make sense to put the sensor on the hot side of the radiator.  (It's
>also easier than putting it in the head, sorry Brian) The location is
>irrelevant, however, it will be easier to select the switch temperature
>ranges if they are installed in the radiator's hot side rather than the cold
>side, because it can be directly correlated to the thermostat operation.
>
>The other major question I had, which has been resolved by your posts and a
>good hard thinking through, on my part, was the coordination of the
>operating temperatures of the fan switch and the thermostat.  The electric
>fan should turn on at a temperature high enough above the thermostat full
>open temperature to prevent "accidental" operation, but should turn off
>somewhere within the operating range of the thermostat.  I suspect having
>the fan turn off close to, but above, the thermostat rating is optimum.
>
>For those on the list who are unaware of how a thermostat operates, the
>rated temperature is the temp at which the thermostat BEGINS to open,  It
>will not be full open until somewhere around 15-20°F(8-11°C) higher than the
>rated temperature.
>
>The double cooling fan approach used on the TR8, and other cars, is
>intriguing to me as I am concerned about the total amperage "hit" on my
>Lucas generator.  I use a 160°F(71°C) thermostat, which is full open at
>180°F(82°C)  Using a staged approach will enable me to use two smaller fans
>(if I can find a set in a shroud that will fit the radiator.)  If the first
>an kicks on at 195°F(90°C) and the second at 205°F(96°C) I should be pretty
>well covered.  205°F(96°C) is pretty hot for a TR3, but I believe it will be
>OK for the occasional traffic jam.  The staged fans will result in less
>electrical consumption when the first fan on kicks on, but probably more
>overall (than a single big fan) when the second fan kicks in.  Hopefully,
>the second one will never be needed.  An interesting thought.
>
>Thanks gentlemen, I really appreciate your help.
>
>Best regards,
>
>Jack Brooks
>TS69032L
>NJ car show: http://pages.hotbot.com/family/triumph
>
>


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