Subject: New info´s Author: webhorn4477 : member since November, 2009 : 45 posts Posted on: 2009-12-06 19:25:30

Hi Rajaie,

the "UT"-logo stands for "UniTech AG", a company in Kirchdorf/Krems in Austria, ~190 km east of Munich. Around the year 2000, they were bought by the TCG Group and are now called "TCG Unitech AG". Here is their website: http://www.unitech.at/

The beforementioned user (who is, by the way, not a BMW-engineer but used to work with Unitech) stated as a reply to your translated answer (which you can find here: http://www.auto-treff.com/bmw/vb/showthread.php?postid=2608633#post2608633) that it is wrong that the type of HNBR used isn´t compatible with synthetic oil. Every approved material in this area would have been tested with various kinds of oils, including synthetics.

Well, as i think, the main reason for the OEM-O-Ring failure is too little resistance against high temperatures. AFAIK every gasket material´s aging process is beeing sped up by the amount of teperature degrees it is confronted with- the more, the faster. So, the nearer you get to the rated upper temperature limit of a material, the faster it ages. This may be the reason for the premature OEM-ring failure. It may also be possible that the OEM HNBR-Rings are "officially" not the right choice: Though the engine coolant temperature (with an intact cooling system) should not even on hot spots in the engine exeed 120°C, it is very well possible for the engine OIL when going full throttle w/ high rev´s on a hot day for some time to exeed 150°C even in the sump- probably a sure death for HNBR-Rings.
Anyway, the higher the temperature rating of a gasket material, the longer it lasts.

About the low temperature problem with Viton: i´ll see how everything turns out through the winter (which is not THAT cold in my part of germany). I know now how my engine has to run with a working vanos and will notice changes immediately. But i don´t expect any- have read on a lot of forums about the beisan rings before install and never heard from anyone with problems due to a cold environment.

webhorn

P.S.: England is too warm for proper cold climate testing of the rings. Maybe you sold some to Alaska? That would be the proof ;-)

• Q @ Rajaie: Type of Viton used - webhorn4477 2009-12-02 07:02:02 (733 views)
  • Re: Q @ Rajaie: Type of Viton used - Rajaie 2009-12-03 01:23:10 (826 views)
    • Re: Q @ Rajaie: Type of Viton used - webhorn4477 2009-12-05 14:25:30 (612 views)
      • Yes! (nt) - Rajaie 2009-12-05 15:46:54 (523 views)
        • New info´s - webhorn4477 2009-12-06 19:25:30 (582 views)
          • Re: New info´s - Rajaie 2009-12-06 23:24:25 (547 views)
            • Re: New info´s- and a little prob. - webhorn4477 2009-12-07 06:19:47 (590 views)
              • Re: New info´s- and a little prob. - Rajaie 2009-12-09 00:25:55 (520 views)
                • Re: New info´s - webhorn4477 2009-12-09 15:58:22 (489 views)
                  • Re: New info´s - Rajaie 2009-12-10 01:39:56 (466 views)
                  • Thanks for the super feedback and help with promoting! (nt) - Rajaie 2009-12-10 01:12:54 (503 views)
                    • Re: Thanks for the super feedback and help with promoting! - webhorn4477 2009-12-10 05:52:37 (513 views)
                      • Re: Thanks for the super feedback and help with promoting! - Rajaie 2009-12-10 16:28:56 (456 views)
                        • Re: Thanks for the super feedback and help with promoting! - webhorn4477 2009-12-10 18:11:37 (519 views)
                          • Re: Thanks for the super feedback and help with promoting! - poolman 2009-12-12 10:13:32 (476 views)
                            • Thanks for the suggestion! - webhorn4477 2009-12-15 04:32:51 (565 views)