engine temps

afcbadam · 31st August 2008, 21:20

out of intrest what are the temperatures of the fluids in the engine when fully hot. i.e the water and oil ect.

T-Cut · 1st September 2008, 00:26

The coolant fan first trips in when the 'water' temperature reaches around 100 degrees Centigrade. The fan speed depends how hot the 'water' gets. Above 110 degrees or so, the fast speed will operate. Under typical running conditions, the fan may not operate at all, so what is defined as 'fully hot' depends on the circumstances. You can check your actual coolant temperature by running the diagnostic test described elsewhere.
The engine oil temperature isn't measured directly. I guess 200 Centigrade will occur in certain places e.g valve stem lube. The sump oil temperature will be lower, but I'd guess it's always well above the coolant temperature. The diesel engine runs cooler than the petrols.

TC

afcbadam · 1st September 2008, 15:42

wow that is hot!

T-Cut · 1st September 2008, 19:27

Quote:

Originally Posted by afcbadam

wow that is hot!

It gets even hotter internally. Driven normally, the exhaust valve heads will be glowing a cherry red colour. The inlet valves run slightly cooler, being in contact with the incoming fuel vapour and cold air.

Driven briskly, your exhaust manifold will glow in the dark, as will your front discs if you tend to drive rally style!

TC

31st August 2008, 21:20	#1
afcbadam Gets stuck in 2004 MG ZS 180 Join Date: May 2008 Location: Southampton Posts: 978 Thanks: 0 Thanked 0 Times in 0 Posts	engine temps out of intrest what are the temperatures of the fluids in the engine when fully hot. i.e the water and oil ect. __________________ AFC Bournemouth www.themgzs.co.uk Inner wing open cone Oil catch tank Janspeed cat back Janspeed de-cat Reidy Re-mapped

1st September 2008, 15:42	#3
afcbadam Gets stuck in 2004 MG ZS 180 Join Date: May 2008 Location: Southampton Posts: 978 Thanks: 0 Thanked 0 Times in 0 Posts	wow that is hot! __________________ AFC Bournemouth www.themgzs.co.uk Inner wing open cone Oil catch tank Janspeed cat back Janspeed de-cat Reidy Re-mapped

1st September 2008, 00:26	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The coolant fan first trips in when the 'water' temperature reaches around 100 degrees Centigrade. The fan speed depends how hot the 'water' gets. Above 110 degrees or so, the fast speed will operate. Under typical running conditions, the fan may not operate at all, so what is defined as 'fully hot' depends on the circumstances. You can check your actual coolant temperature by running the diagnostic test described elsewhere. The engine oil temperature isn't measured directly. I guess 200 Centigrade will occur in certain places e.g valve stem lube. The sump oil temperature will be lower, but I'd guess it's always well above the coolant temperature. The diesel engine runs cooler than the petrols. TC