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Running Too Hot


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#1 johnv

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Posted 11 June 2018 - 07:55 AM

New build 998 cooper, mildly tweaked, nothing serious. Everything is new, but it just seems to be running about 10 degrees too hot. With the heater valve closed it sits just to the right of N at 60-65, with it open its just to the left of N, where I want it .. BUT, as soon as you slow, even at lights, it will creep up .. and in a bit of a wait to get into Beaulieu this morning it went half way to hot and started spitting water out of the overflow. 
It's running really sweetly apart from that .. I can't see any evidence of head gasket problems .. where to go next? .. any advice gratefully received, thanks
 

 

 



#2 Carlos W

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Posted 11 June 2018 - 08:07 AM

Fan on the right way around?

Timing and mixture correct?

#3 johnv

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Posted 11 June 2018 - 08:27 AM

fan definitely right, mixture is right, timing .. well, after trying all sorts of technical methods I advanced it until it pinked, then backed it off a bit



#4 Swift_General

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Posted 11 June 2018 - 09:44 AM

timing .. well, after trying all sorts of technical methods I advanced it until it pinked, then backed it off a bit


I would set the timing properly before doing anything else. Then see where you're at.

#5 kyle_1275

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Posted 11 June 2018 - 12:01 PM

What thermostat are you running with? Could be a high temp variant.

Edited by kyle_1275, 11 June 2018 - 11:18 PM.


#6 johnv

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Posted 11 June 2018 - 04:12 PM

I'm going to try without a thermostat to see if it makes a difference

 

if it was the timing it would mean it was too far advanced wouldn't it? and it's not pinking



#7 russo

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Posted 11 June 2018 - 09:22 PM

Try an alternative means of checking the temperature. It could be your guage is not reading correctly. Is it mechanical or electric type?



#8 Carlos W

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Posted 11 June 2018 - 10:26 PM

I'm going to try without a thermostat to see if it makes a difference
 
if it was the timing it would mean it was too far advanced wouldn't it? and it's not pinking


Don't run without a thermostat.

What thermostat is it running?

#9 nicklouse

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Posted 11 June 2018 - 11:34 PM

new build. they do tend to run warm at first as there is often a bit more work to do.

run with a thermostat running with out does nothing and can make things worse.

how full do you fill with water? over filled? is the correct cap fitted?



#10 kyle_1275

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Posted 11 June 2018 - 11:39 PM

Airlock in the system perhaps? Run with the rad cap off for a short while until it starts bubbling over and stick the cap back on.

#11 johnv

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Posted 12 June 2018 - 06:21 AM

new build. they do tend to run warm at first as there is often a bit more work to do.
run with a thermostat running with out does nothing and can make things worse.
how full do you fill with water? over filled? is the correct cap fitted?



#12 johnv

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Posted 12 June 2018 - 06:23 AM

I'm using a 13lb cap. Running without the thermostat will surely prove if it had been opening or not, how could it make it worse?
I could well have overfilled it to start with I'll make sure I'm just on the mark

Edited by johnv, 12 June 2018 - 06:51 AM.


#13 unburntfuelinthemorning

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Posted 12 June 2018 - 07:40 AM

I'm using a 13lb cap. Running without the thermostat will surely prove if it had been opening or not, how could it make it worse?
I could well have overfilled it to start with I'll make sure I'm just on the mark

You can run without a thermostat (not really recommended) but you must use a blanking sleeve in it's place otherwise the cylinders farthest away from the thermostat can end up running hotter.

 

http://www.minispare...|Back to search

 

You could also just try a different thermostat and maybe test them by boiling in a pan of water if you have a thermometer which reads high enough to stick in it.


Edited by unburntfuelinthemorning, 12 June 2018 - 07:41 AM.


#14 nicklouse

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Posted 12 June 2018 - 08:02 AM

I'm using a 13lb cap. Running without the thermostat will surely prove if it had been opening or not, how could it make it worse?
I could well have overfilled it to start with I'll make sure I'm just on the mark

as mentioned. poor flow.

 

way better way to check a thermostat is a pan of water and your eyes.



#15 Carlos W

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Posted 12 June 2018 - 08:15 AM

Fix the problem not the symptoms




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