RX7WEEE

iTrader: (16)

Has any one thought about makeing one?
TI is alot stronger than the steel thats used for our apex seals. The only problem I could think of would be that it would take a long *** time to break in. And the bathtub may wear out befor the seal does.
Dont know just a thought.

teamstealth

titanium is not a good material for wear when being rubbed against something (cant think of the technical term), and the tolerances when heated are much larger.

Engberg

Replying Mahjik style

Check these:

https://www.rx7club.com/showthread.p...ium+apex+seals

https://www.rx7club.com/showthread.p...ium+apex+seals

https://www.rx7club.com/showthread.p...ium+apex+seals

911GT2

You forgot the little arrow up at the top as a message icon. Thats classic Mahjik

Slacker7

iTrader: (2)

More Abrassive?

kyle@insight

If I remember correctly someone tried this a while back. Basically sacrificed his motor in the name of developement. Unfortunatly, it didn't pan out as well as we had all hoped and he had to rebuild the motor after a few miles.

xstacy7

I'll take a shot in the dark and say friction?

- remember I live in tennessee

RX7WEEE

iTrader: (16)

oh well hows about carbon fiber JK

Slacker7

iTrader: (2)

uuuhhh???

What does living in tennessee got to do with anything

Engberg

dont' think of it as ti being abrasive, it is the ti on another metal. Much like steel on aluminum, unlike metals typically don't wear well against eachother.

Slacker7

iTrader: (2)

I was wondering about that. Since Ceramics are harder than Ti wouldn't ceramics be more abrasive?
Besides aren't ceramics used as abrasives?

Larz

We need someone with a PhD to answer this.

TurboFD

its also a good idea to think about what it would be like if your motor would go. how would the ti break?

poss

iTrader: (5)

Are you looking for "galling?"

sbertolone

some one beat me to the punchline, we had some aluminum gall really bad on an arm on our robot one year, it was inside a bearing and we had to cut it up to get it apart.

Shamrock.James

well don't know if anyone has though of this yet but, but there actully something called ceramic titanium, it's what they use on the great new fry-pans..

http://www.scanpan.com

i was thinking it might be really good for apex seals as you have the streght and lighness of Titanum, but the hardness from the ceramic, it shouldn't be abrasive at all and the housings are ceramic coated anyway right???

also think of the heat stress a frying pan goes under, and these ones are marked as scratch proof..

Engberg

Nope, not going to use a word w/out defining it..what would be the good of saying galling if everyone doesn't know what it meant. More than one engineer on this board but no sense to always talk like one Galling is used throughout the linked posts but some people still have questions.

fastrotaries

Ti has a high gauling (SP) characteristic. It's tensile strength isn't all that high. It just has a high memory reflex. I wish I would have paid better attention in class.

Slacker7

iTrader: (2)

You also have to look at friction properties. the coefficient of friction between the ti and the housing is probably pretty high

fastrotaries

Ti i think could be better used in aplications such as the apex seal spring, and such. Where it's not really rubbing against something else and it's memory can be better served.

drago86

Seems like there one of these threads every other week. For some reason everyone thinks titanium is the end all, be all, of metals. Titanium has its applications but apex seals are not one of them. Look at things in similar environments as apex seals performing similar functions, like piston rings, exhaust valves, or other forms of sliding seals in industrial applications. ceramics and steels come out on top. A titanium nitride coating might be useful however,... until it wore off.

particleeffect

oo oo, well we are on the topic of magic apex seals how about something coated in teflon? (thinking they use it on stove stuff, i know it's not near as hot as combustion temps...) or how about like a Ti plating on the rotor housings, and then Ti seals?

quick, someone knock me down!