XPost: comp.mobile.android, misc.phone.mobile.iphone   
   From: am@yellowjersey.org   
      
   On 5/15/2022 4:36 PM, Andy Burnelli wrote:   
   > AMuzi wrote:   
   >   
   >> Differential thermal expansion does not require entering   
   >> the plastic zone for the entire piece.   
   >   
   > Finally someone on this newsgroup is using their brain.   
   >   
   > It's disconcerting that most people completely ignored the   
   > dozen references   
   > I provided and that they provided, in turn, a 20-second   
   > youtube from a kid   
   > in NJ which shows absolutely nothing whatsoever - and yet   
   > they think it   
   > does.   
   >   
   > They may as well claim the earth is flat in a 20 second   
   > video from a kid in   
   > NJ who _proves_ it beyond any doubt in their (strange)   
   > low-IQ brains.   
   >   
   > Anyway, Amuzi brings up an _excellent_ point that you don't   
   > likely need the   
   > 2300 degrees it takes to _begin_ melting a typical cast iron   
   > rotor.   
   >   
   > But bear in mind even the best brake fluid boils off at well   
   > under one   
   > quarter of that temperate, and that the rubber in the   
   > braking system would   
   > be marshmallows anywhere near the "zone of thermal   
   > expansion" Amuzi alludes   
   > to, and we have what appears to be a situation which   
   > requires more data.   
   >   
   > At what temperature does a rotor 'soften' is key here, I   
   > think, isn't it?   
   > Isn't that what Amuzi is alluding to?   
   >   
   > Certainly if you leave the rotors on a steel rack at a   
   > thousand degrees for   
   > ten hours (which we learned in the paper Vic Smith   
   > referenced), they will   
   > "increase" their "distortion"; so I _believe_ what Amuzi is   
   > alluding to.   
   >   
   > However, nobody here is going to claim that their rotors   
   > spent ten hours at   
   > a thousand degrees and _then_ they declared that they   
   > warped, right?   
   >   
   > The brake system components (piston gaskets, fluid lines,   
   > fluid, etc.)   
   > would be marshmallows at even the "low" temperature of a   
   > thousand degrees.   
   >   
   > In summary, I get it that people _believe_ their rotors   
   > warped, and yet,   
   > I've _never_ seen anyone who said that who actually   
   > _measured_ it, and,   
   > worse, I found a dozen experts who claim it's impossible   
   > given the   
   > temperature required is greater than the brake system can   
   > handle.   
   >   
   > If Amuzi is correct that warp (aka "thermal distortion")   
   > happens at a lower   
   > temperature than a thousand degrees for ten hours, then I'm   
   > all ears.   
   >   
   > Give me a fact, and I'll read it.   
   > Does anyone have any reliable cites that back up their   
   > belief system?   
      
   Brake pads are thermal insulators so whatever is going on at   
   the rotor doesn't necessarily melt rubber bits or boil brake   
   fluid. There's also ample airflow and space between rotor   
   and other components. Even brake shoe holders have minimal   
   contact with calipers.   
      
   Also, out in the world, boiling brake fluid is virtually   
   unknown but warped rotors, while not commonplace, are   
   regularly noted in brake service.   
      
   --   
   Andrew Muzi   
        
     Open every day since 1 April, 1971   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)