OK boy and girls, another lesson in metallurgy. Alloys generally melt at a lower temperature than the parent metal. I looked it up to refresh my memory, and found that aluminum alloys melt at a range of 865 - 1240 f. The fact that there is not an immediate failure if the exhaust temp gets to 1200 is because there is always a cooling effect in the combustion cycle and only one small area will reach the melting point at some time during the cycle for a tiny fraction of a second. The thickness of the piston alone is often enough to stall failure, and our IDI engines have a flow of oil cooling the pistons from underneath constantly. The fact remains that it is very dangerous to the life of the engine to run high EGTs on a continuous basis.
There are iron coated pistons around, some used in aluminum block engines like the late 60s ZL-1 Chevy.
Silicon and other elements are added to aluminum to make it useable in various purposes. ****** aluminum is far too soft to be used in automotive engines.
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I'm not pointing out a failure or falsehood in someones posts. But looking at the number of posts we both have and we joined this board about the same time. It appears I have over 14,000 more posts. Validation for what I post....
Maybe
Angry about the posting about wasting time porting an idi head.. Nope. Just sad that someone can't see the usefullness in it. Sometimes I feel I failed to help others to understand whats known to work and work well. Moving on now..
please continue...
