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Teflon rod as piston material?
Posted: Mon Nov 08, 2010 10:25 am
by davesisk
I've seen Telfon (PTFE) mentioned several times as piston ring material...how about Teflon rod for the actual piston material? Here's a link to a supplier:
http://www.onlinemetals.com/merchant.cf ... op_cat=181
I looked up the properties...looks like Teflon has a max working temp of 260 degrees C / 500 degrees F.
Thoughts?
Dave
Re: Teflon rod as piston material?
Posted: Sun Dec 05, 2010 2:06 pm
by Chriske
I think it's not workable because of the expansion, caused by the engine's heat.
Never tested it myself...
Other thoughts....?
Chris
Re: Teflon rod as piston material?
Posted: Mon Dec 06, 2010 2:12 am
by Ian S C
If you'v ever pulled a car shock absorber to bits (great resource of parts for engines)you may find a plastic piston ring, some have cast iron rings, with some teflon sheet about 1mm thick, make a strip the width required and say 6mm longer than the circumference, then either cut the end diagonally,or make a stepped end, leave a little gap lengthwise to allow expansion. An aluminium piston, with a Teflon ring, or maybe two would be OK, Aluminium on its own has too high friction (got to get rid of as much as pos). Ian S C