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   rec.autos.tech      Technical aspects of automobiles, et. al      117,728 messages   

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   Message 116,822 of 117,728   
   Andy Burnelli to AMuzi   
   Re: Empiricism trumps Arlen's idiocy (wa   
   15 May 22 22:36:27   
   
   XPost: comp.mobile.android, misc.phone.mobile.iphone   
   From: spam@nospam.com   
      
   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?   
   --   
   And no, a 20 second video of a kid in NJ making claims is not reliable.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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