Understanding the 100* heat issue

[Kilstorm]

OK I get not to take off if the engine is 100* or hotter but heres a few questions.

1) what happens if you do? Wheres the wear or whats expected to be damaged? What signs should I be looking for?

2) While it says never to take off if the temp is above 100* that doesnt mean we cant taxi out or in above that temp or does it? Just not to take off with the engine running that hot. I mean once in flight its ok to run the engine at 110* right?

Thanks for any help

[Bleddyn]

Well just keep in mind that water boils at exactly 100°C so if you are running at 110°C you are trying to cool your engine with boiling water.

[MTFDarkEagle]

Wasn't the cooling system filled with glycol?

[killerwatt]

Well just keep in mind that water boils at exactly 100°C so if you are running at 110°C you are trying to cool your engine with boiling water.

Cup of tea, anyone?

[torejohs]

Glycol boils at 200C, doesn't it?

[lonewulf47]

Wasn't the cooling system filled with glycol?

Actually a Glycol-Water Mixture to increase the boiling point. Nevertheless the system works with overpressure so the boiling point even of that mixure is increased. Once it starts to reach the overpressure limit a valve opens and relieves the steam. It is adviseable at this point to definitely reduce power, open the radiator fully and look for a decent landing site.....

Oskar

[torejohs]

That valve's on the right hand side, right? I've seen that steam a lot just as I shut down. Never taken damage from it yet, since it usually happens right before I shut down.

[MTFDarkEagle]

Negative, the window-deice valve, and the master oxygen valve are on the right

The valve oskar is talking about, is a pressure relief valve, which is internal.

[CodyValkyrie]

Well, you are both right. The pressure relief valve when sitting inside the cockpit is located on the right side of the cockpit... but is not something that can be ACCESSED from the cockpit. It is one of the little holes on the fuselage behind the spinner. You will easily know when the pressure is being released, as a ton of white smoke will be coming from that side of the aircraft with a very nice hissing noise. This is being released to prevent high pressure damage which is caused by the high temperatures. If this is not corrected quickly, damage or increased wear WILL result.