What should the water temp be on Cosworth?
26-10-2009, 05:34 PM
#1
What should the water temp be on Cosworth?
Been using my car for a while now and noticed that the water temperature always seems quite low.
Sitting on the motorway at around 70mph the water temp seems to sit at 56-59 degrees depending on how hot the weather is.
If you sit in traffic it raises to about 72 degrees but the fans will kick in around there somewhere, the hottest i have ever seen is 74 degrees.
Reason i ask is my Golf daily driver always sits at 90 degrees on the gauge.
The car is a Sierra Cosworth running a Pro Alloy rad and the readings are coming directly from the ECU.
Is there any cause for concern with it running this cool or is it better to be cooler?
Could it just be that the reading is coming from a different place to what the clocks read from?
Sitting on the motorway at around 70mph the water temp seems to sit at 56-59 degrees depending on how hot the weather is.
If you sit in traffic it raises to about 72 degrees but the fans will kick in around there somewhere, the hottest i have ever seen is 74 degrees.
Reason i ask is my Golf daily driver always sits at 90 degrees on the gauge.
The car is a Sierra Cosworth running a Pro Alloy rad and the readings are coming directly from the ECU.
Is there any cause for concern with it running this cool or is it better to be cooler?
Could it just be that the reading is coming from a different place to what the clocks read from?
26-10-2009, 06:41 PM
#2
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Sounds a bit low. Have you checked the thermostat? i think it should open at 86degrees.
Or the gauge is way off. And where do you measure the temps?
Or the gauge is way off. And where do you measure the temps?
Last edited by rinus_2005; 28-10-2009 at 07:21 PM. Reason: foud a typo..
27-10-2009, 09:31 AM
#6
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Ideal operating temperature is in the mid 80s.
Gav, if yours is in the mid to high 50s it will be referencing the cold start enrichment areas of the map still (if it has such maps - not sure who's mapped yours fella).
What's the spec of the cooling system?
Gav, if yours is in the mid to high 50s it will be referencing the cold start enrichment areas of the map still (if it has such maps - not sure who's mapped yours fella).
What's the spec of the cooling system?
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27-10-2009, 07:36 PM
#11
Testing the future
how is the conversion done in your dash? do you know what curve is applied to the voltage across the sensor, as it's not a linear relationship?
table of temperature vs. resistance shown here:
http://www.mmcompsys.com/download_zo...ntc_web_01.pdf
table of temperature vs. resistance shown here:
http://www.mmcompsys.com/download_zo...ntc_web_01.pdf
28-10-2009, 03:58 PM
#13
20K+ Super Poster.
Mine sits around 86-90, but have my fans come on at 95C and go off at 92C, was 100C and 97C, without problems, just wanted them on slightly sooner.
I've not had much luck with gen ford stats, so now use only WAHLE(sp) stats, 3 times the price, but work perfect, warm up time has decreased massively.
tabetha
I've not had much luck with gen ford stats, so now use only WAHLE(sp) stats, 3 times the price, but work perfect, warm up time has decreased massively.
tabetha
28-10-2009, 04:23 PM
#14
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Mine sits at 94-95 on normal driving with the fans kicking in at around 100-105 as its bedding in. But then again, my water temp gauge is a little funny 
28-10-2009, 05:17 PM
#18
Stu
Took the thermostat off today and have found the problem
Some how the rubber seal has dislodged from the lip.
Thought i was imagining it taking longer to get to temp.
Not sure if its clear in the pic but the lip on the housing is quite corroded so i think this may have been the reason for the seal moving, have got a new thermostat coming and also got a better condition housing.
Just wish i had seen Tabatha's post before buying a Ford one, but least i know to keep my eye on it now.
Cheers for the info guys
Took the thermostat off today and have found the problem
Some how the rubber seal has dislodged from the lip.
Thought i was imagining it taking longer to get to temp.
Not sure if its clear in the pic but the lip on the housing is quite corroded so i think this may have been the reason for the seal moving, have got a new thermostat coming and also got a better condition housing.
Just wish i had seen Tabatha's post before buying a Ford one, but least i know to keep my eye on it now.
Cheers for the info guys
28-10-2009, 05:23 PM
#19
I do not believe its the sensor at fault just the standard fan switch and alloy rad.
Here is a quote from Stu's fan switches page on ebay
Secondly, on many cars, when the fans DO actually work, they often come on too soon, and then wont go off when you are moving. Thats because the original system was a little close to the bone to start with and whilst on the standard rad it is not always too much of a problem, put an aftermarket radiator on and you will run into switching problems such as the fans will stay on even on the motorway at 70mph. This is due to the heatsink effect from the alloy end tanks and teh current draw from teh system often leaves the ECU and Fuel system circuit with woefully inadequate current supply, leading in some cases to damaged engines!
http://cgi.ebay.co.uk/UPRATED-Ford-S...item3ef93591b3
I have one of these fan switches to fit as soon as i can find it
how is the conversion done in your dash? do you know what curve is applied to the voltage across the sensor, as it's not a linear relationship?
table of temperature vs. resistance shown here:
http://www.mmcompsys.com/download_zone/6_sensors/ntc_web_01.pdf
table of temperature vs. resistance shown here:
http://www.mmcompsys.com/download_zone/6_sensors/ntc_web_01.pdf
Last edited by Gav Diamond; 28-10-2009 at 05:26 PM.
28-10-2009, 06:36 PM
#20
Testing the future
28-10-2009, 06:42 PM
#21
certainly looks like it. water bypassing the stat will show those symptoms every time. presumably your dash has shown the correct temperature when you first installed the stat, so unlikely to be what i suggested anyway, but it might be worth looking at anyway so that you know you have an accurate display
Will see what it reads once the car is back together.
30-10-2009, 12:30 PM
#22
20K+ Super Poster.
The major problem with the ford fan switch is the range, sure when I measured it it span 13C, which is ridiculous, then the stat and fan sw fight stat wanting it hotter than the switch wants!!!
The "modded" switch supplied by msd addresses this problem, with a (from memory) 5 or 6C span.
tabetha
The "modded" switch supplied by msd addresses this problem, with a (from memory) 5 or 6C span.
tabetha
.
03-11-2009, 05:35 PM
#27
Mike
Mine is on T2, is this something i can easily sort myself or am i just better off fitting the new fan switch and seeing how it works first.
Also i run a seperate fan loom so i would assume i some how would have to wire the fans into the ECU??
Mine is on T2, is this something i can easily sort myself or am i just better off fitting the new fan switch and seeing how it works first.
Also i run a seperate fan loom so i would assume i some how would have to wire the fans into the ECU??
Last edited by Gav Diamond; 03-11-2009 at 05:36 PM.
06-08-2013, 05:50 AM
#28
My Cosworth water temp gauge points at 'R' while cruising normally. When it gets bit hotter (city driving, booting etc.) it points 'O' and then fan kicks in. Anyone know what are those temperatures in celsius, as I only have original water temp gauge and I'm curious. And also, what is the temperature on the red area of the gauge? Thanks.
06-08-2013, 08:38 AM
#29
My Cosworth water temp gauge points at 'R' while cruising normally. When it gets bit hotter (city driving, booting etc.) it points 'O' and then fan kicks in. Anyone know what are those temperatures in celsius, as I only have original water temp gauge and I'm curious. And also, what is the temperature on the red area of the gauge? Thanks.
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