CSH needed here too/Rad fans on 165 on/off

[CSH-HQ]

What this country needs is a good recirculating thermostat like them
"dumb" Fiat/Audis used with the 1+" bypass hose.....
THen, we can have some MPG gain with a cold engine, and lessen the belt loads
Grumpy


>If the sensor were in the RAD then think of the other state.. if the 
>rad is satisfied but the head is hot and the stat opens then the fan 
>will not come on until the hot flows from the head into the RAD... 
>where it should have been on based on the hot head. I think it takes 
>5 or 6 seconds at most if I had to guess.
>
>we have this dilems in building controls constantly. imagine a 
>variable speed water pump in the mix.. on a reeal cold day the demand 
>for engine cooling is not great, thus the pump is slowed way down, so 
>when the engine cracks the stat a bit, it takes a while for the cool 
>water to hit the head - and the cool water is 25 degrees cause its 
>going thru the radiator sooo slow. 
>
>it depends on where the sensor is I guess - before or after the head.
>
>you can apply hardware or even valves etc to maintain the temperature 
>- good for situations where consistancy is an issue but for trips to 
>the store.. they might call whats there good nuff. the err is on the 
>side of better emissions.. but warranty? which is more valued at 
>corporate?
>
>
>
>> From:          Mike Rolica <mrolica at meridian-mag.com>
>> To:            "'gmecm at efi332.eng.ohio-state.edu'" 
<gmecm at efi332.eng.ohio-state.edu>
>> Subject:       RE: CSH needed here too/Rad fans on 165 on/off
>> Date:          Fri, 5 Nov 1999 16:17:54 -0500 
>> Reply-to:      gmecm at efi332.eng.ohio-state.edu
>
>> HEY EVERYONE GOT MY TRUCK BACK YIPEEEEE.  Custom rad is excellent looks
>> beautiful!! Now for the efi stuff.
>> Just wondering how the ecm controled rad fan stuff works.  How can it know
>> when to turn on the fan and when to turn it off? If the temp sensor is in
>> the head?  Should it not be in the rad?  Ie, once the head reaches