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Loud Exhaust Ignition Timing

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Old Mar 12, 2016 | 12:45 AM
  #1  
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Loud Exhaust Ignition Timing

Have anyone experience knock and their ignition retarding after they have switched to a loud (Louder) muffler?

As ridiculous and unrelated as this sounds, I'm noticing a retard of 6-8 degrees during wide open throttle versus before muffler change. Both mufflers are 2" internal diameter. One is just much louder than the other.
 

Last edited by Myxalplyx; Mar 12, 2016 at 08:47 AM.
Old Mar 12, 2016 | 10:40 AM
  #2  
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Found out the answer to my question. Had my muffler changed out to a larger, much quieter one this morning and tested. Ignition timing returned back high again.

You learn something new everyday.
 
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