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[GMCnet] Harmonics in my exhaust system [message #319037]

Wed, 14 June 2017 21:14

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma:

Senior Member

The harmonics happens at about 2100 . Then stops. Then returns at about 3900 to 4100 RPMs. But not as strong. Both at moderate throttle. It's a 403 with a stock exhaust system. I thought it was the double wrapped mufflers. So I put on two Flow master series 40 units. No change. But these are real solid/welded mufflers. I have an idea. Any thoughts? Bob Dunahugh 78 Royale 403
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		[GMCnet] Harmonics in my exhaust system By: BobDunahugh on Wed, 14 June 2017 21:14
		Re: [GMCnet] Harmonics in my exhaust system By: Bullitthead on Thu, 15 June 2017 00:42
		Re: [GMCnet] Harmonics in my exhaust system By: JohnL455 on Thu, 15 June 2017 08:13
		Re: [GMCnet] Harmonics in my exhaust system By: Larry on Thu, 15 June 2017 08:43
		Re: [GMCnet] Harmonics in my exhaust system By: BobDunahugh on Thu, 15 June 2017 13:03
		Re: [GMCnet] Harmonics in my exhaust system By: BobDunahugh on Thu, 15 June 2017 19:58
		Re: [GMCnet] Harmonics in my exhaust system By: BobDunahugh on Fri, 16 June 2017 23:33
		Re: [GMCnet] Harmonics in my exhaust system By: BobDunahugh on Sat, 17 June 2017 13:54
		Re: [GMCnet] Harmonics in my exhaust system By: jhbridges on Thu, 15 June 2017 15:37
		Re: [GMCnet] Harmonics in my exhaust system By: Bill Van Vlack on Thu, 15 June 2017 18:44
		Re: [GMCnet] Harmonics in my exhaust system By: Ken Burton on Thu, 15 June 2017 23:42
		Re: [GMCnet] Harmonics in my exhaust system By: wally on Fri, 16 June 2017 06:32
		Re: [GMCnet] Harmonics in my exhaust system By: jhbridges on Fri, 16 June 2017 07:55
		Re: [GMCnet] Harmonics in my exhaust system By: Bill Van Vlack on Fri, 16 June 2017 17:22
		Re: [GMCnet] Harmonics in my exhaust system By: jhbridges on Sat, 17 June 2017 08:01
		Re: [GMCnet] Harmonics in my exhaust system By: James Hupy on Sat, 17 June 2017 09:44
		Re: [GMCnet] Harmonics in my exhaust system By: James Hupy on Sat, 17 June 2017 14:41
		Re: [GMCnet] Harmonics in my exhaust system By: mrgmc3 on Sat, 17 June 2017 17:04
		Re: [GMCnet] Harmonics in my exhaust system By: GMC.LES on Sat, 17 June 2017 17:10
		Re: [GMCnet] Harmonics in my exhaust system By: Ken Henderson on Sat, 17 June 2017 17:38
		Re: [GMCnet] Harmonics in my exhaust system By: jhbridges on Sat, 17 June 2017 21:27
		Re: [GMCnet] Harmonics in my exhaust system By: James Hupy on Sat, 17 June 2017 22:22
		Re: [GMCnet] Harmonics in my exhaust system By: USAussie on Sat, 17 June 2017 23:35
		Re: [GMCnet] Harmonics in my exhaust system By: James Hupy on Sat, 17 June 2017 23:41

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