New to this site, lots of good info. My question is, are our LLY`s aluminum or an alloy of aluminum with a higher melting point than just aluminum? The reason I ask is I have the Edge Juice and the EGT alert is set at the factory at 1350F. ,but the melting point of straight aluminum is 1220F. Why would Edge preset this so high? I may have already damaged my motor towing my fifth wheel, I hit 1280F already for a short time climbing a hill. Any input would be greatly appreciated. Thanks. Chris.

Don't worry you didn't do any damage at 1280F. Many have seen 1800+ for close to a minute.

That is the exhaust gas temp. The aluminum is being cooled all the the time to keep the metal itself well below the melting point.

The exhaust valves and turbo are another matter......

To draw an analogy, what would happen if you put a pot of water in an oven heated to exactly 212 degrees, would the water boil instantly? My bet is that it would take all day. Even if the oven was up around 300, about 150% the boiling temp of water, my bet is that the water would still take quite some time to even start steaming, much less boil.

Does that make any sense?

Marc

Yup, didnt think of it that way, glad this forum is here!!

Then why does hot coffee steam? Water will start to evaporate well below the boiling point. Not trying to be a smart-a$$, and your point is thematically true, the lower the temperature, the longer it will take to boil. If you look at a speed distribution of the molecules in a liquid state (or solid state) using the fact that some molecules in the liquid are more energetic than others, some of the faster moving molecules in the liquid penetrate the surface and leave the liquid even at temperatures well below the boiling point. The molecules that escape the liquid by evaporation are those that have sufficient energy to overcome the attractive forces of the molecules in the liquid phase. The molecules left behind in the liquid phase have a lower average kinetic energy, causing the temperature of the liquid to decrease. This is exactly why sweating lowers your body temperature when it evaporates off your skin, well below the boiling point.


Dennis

But I digress, sorry, got sidetracked. The real answer is:


What Fingers said.


Dennis

It wasn't meant to be a perfect, exact scientific answer, just a simple analogy that made sense to me.

I know, it's cool. Like I said I got sidetracked. . . no harm, no foul.http://www.dieselplace.com/forum/smileys/HiHi.gif


Dennis

There are very very few uses for pure aluminum. Everything structural out there is some type of alloy. Pure aluminum is too soft and normally only a powder or pressed powder form.