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Subject: No hurry on the recordings... more
Author: johnhstein as johnhstein, 85-M6CSi, 85 745i (moderator) : member since July, 2004 : 529 posts
Posted on: 2009-10-13 07:40:30      
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Just a curiosity issue... As you may remember my 745 has been down for 'awhile' getting the rebuilt motor. When I shut it down I was running a 3 inch pipe back through a custom Stebro SS resonator, then a single 3 inch pipe to custom Stebro SS muffler where it split internally to a dual 2.5 exit. I had a bit if droning in the 2.4 - 2.6k RPM range. It will be interesting to see if the resonance is still there with the different head/valves, modified Turbo, and with the internal & external ceramic coatings on the exhaust manifold. There is a possibility that the new flow characteristics will have a completely different set of harmonics. Once again, I hope to get it back late this Fall.

More to follow... js

Regards

John Stein
http://www.vrbo.com/169455



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