Chris, sorry for the delay in responding, I've been away most of the week.
I've seen your question asked before. I am no engine expert, but if the fan
is set to come on at a temperature higher than the thermostat, it would mean
you don't believe your rad is cooling the coolant. Having the sensor in the
lower rad tank at a temp that is lower than the thermostat will cause the
fan to kick in only when the rad is not able to keep up with the cooling
required. As you suggest, sitting still in traffic with no air passing
through the rad.
My bro-in-law tells me that VW uses a second thermoswitch in the block with
a two-speed fan. Low speed when the rad thermoswitch is triggered,
high-speed when the block is getting too hot. (or if the A/C is running at
idle)
If anyone has any particular knowledge on the subject, feel free to jump in.
I would guess racing engines would have a different set-up.
Len
----- Original Message -----
From: "Chris DeStaffany" <destaff@yahoo.com>
To: "L&B Lubbers" <lubbers@sympatico.ca>
Sent: Friday, February 16, 2001 7:21 PM
Subject: Re: electric fan conversion web page finally here
Interesting site. I am however confused by one fact.
You say that you use a 190 degree thermostat but the
fan is set at 175. Is it not usual to set the fan to
come on above the temp of the thermostat? Otherwise
it seems to me toi partially defeat the purpose as the
fan will run all the time after inital warm up. That
would also seem to negate the need for a switch at all
as you could just connect it to an ignition hot
circuit and it would run all the time. Every car that
I have driven that had an electric fan was set so that
it wuld only run after the engine started to get much
warmer than the thermostat. They never ran when the
car was at speed. ABout the only time that they ran
here in chilly Washington State was if you let thme
idle for a long time.
Am I missing Something?
--- L&B Lubbers <lubbers@sympatico.ca> wrote:
>
> Hi all
>
> Mike Ginter and a few others wanted to see this back
> in October. I finally
> developed a few pictures of my electric fan
> conversion. Select "Spencer Fan"
> from our home page. There are four pictures and a
> rambling description of the
> event.
>
> Spring is coming.
>
> Len Lubbers | '79 Spitfire | Ottawa, Ontario, Canada
> http://www3.sympatico.ca/lubbers
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