Quote:
Originally Posted by BlueRubber
How do you measure what you consider an engine running overly hot?
Eg the other day I ran the car at 1500rpm for 15mins while doing an oil flush and the outside temperature was about 22 to 24c.
After the above the oil filler cap was quite hot to the touch ie it was almost burning my hand.
Is that too hot?
This was before I fitted the undertray and with the hood open and the front of the car jacked up.
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I would not be unusual for the engine itself to be 100C or more to the touch , enough to burn you ! Then you have the Exhaust manifold and turbocharger/s which can be 400 c to 600c + depending how hard the engine is working .. that will burn your skin off immediately and flood the engine bay with super hot air ... The underbonnet temperature is known by the ECU and the radiator fan will run harder if it all gets too hot even with the ignition off ...