I was wondering if there are any related problems from running a hot engine and then crossing a cold river and submerging the engine under the cold water. Will it affect the strength of the engine casing?
The word is HARDEN. Tempering is done to soften and toughen the previously HARDENED metal to a specific hardness to make it useable without breaking. When hardening the steel is not taken up to "white-hot" but is usually only bright orange.Never heard of such, gaucho10!
Maybe other forum members have direct, personal experience or observation of the phenomenon.
Hey, don't they TEMPER white-hot metal by quenching in cold liquid?
Seriously, the heat-capacity of an engine remains borne by not only the metal molecules, but also the coolant and oil present . . . I think it would take a rather frigid body-of-liquid (as in, total immersion in a vat of liquid nitrogen, etc.) to affect materially the structural integrity of engine cases, but . . . only an opinion, a conjecture . . .
I stand corrected!The word is HARDEN.
I have wondered about this many times.While I've never balked at riding through really cold water with a hot engine, I seem to heed the old warning of not spraying cold water onto a hot engine. Is there a difference? Beats me. I've been warned about this since I first started operating anything with an engine.
I suppose it was more relevant back in the day of cast-iron small engines operating at a million degrees.
When I was racing stockcars we used to spray water through the radiator and over the engine to cool it down before shutting it off between races. The exhaust system would be literally glowing. I can't imagine the thermal shock but I never saw any adverse effects.
Heating a metal to its critical temperature then cooling it very slowly will anneal it to it's softest state.Damocles, "Annealing" by quenching in cooler substance. Is to further SOFTEN, SOFT metals. Aluminum hand brake levers and oil line banjo gaskets, come to mind while dealing with KLR.
Heating a metal to its critical temperature then cooling it very slowly will anneal it to it's softest state.
HA ha!So justjeff...your not getting off this easy....explain....
Is a hot KLR engine considered "heating it up to its critical temp."? For discussion sake, lets assume after a long summer ride in Arizona desert.
And then..."cooling it slowly"...For discussion sake (again), is there a difference from dipping the engine into a cold river compared to pressure washing the bike, compared to just running over a puddle of water. Is there any dangerous difference from one to the other?
I have only brushed with a soft tissue at 20 ft the subject of metallurgy and heat treatment. People study and work with these subjects their whole lives and I am but a lowly beginner. I saw a punch that was hardened but not tempered break into pieces when dropped on the floor. I also saw a custom made milling cutter shatter when it was mistakenly quenched in water rather than oil during hardening. The water cooled it too quickly.JustJeff,
Thanks for the explanation. That is very interesting the way you explained it. I have several friends that for many years were showing me how to heat and dip in cold water, weld, etc doing various home shop projects. I remember them explaining either one or the other as far as what happens when you heat a metal. But I never got it all in one explanation and this really makes sence to me. Thanks again.