ORIGINAL: KC36330
ORIGINAL: piper_chuck
I just confirmed something I tried in the shop a couple days ago. I rubbed a piece of pushrod material against an alumimum engine case and tuned pipe. BOTH caused glitching. [X(]
then they are aluminum alloys, not 100% aluminum.
kc
And most likely so are many other pieces of "aluminum" that one would find on a plane. Bottom line, avoid metal to metal contact.