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Exhaust Systems - Drone at 1400 RPM [message #293381]

Sun, 03 January 2016 22:34

SteveW

Messages: 538
Registered: June 2005
Location: Southern California - Ora...

Karma:

Senior Member

Greetings -

I've got two mufflers on the coach - pretty large ones - pretty certain they're FlowMasters. They're in the original locations. I was surprised to discover that the exhaust system is made up of 2.5" diameter piping. Headers too.

They've got a real nice low rumble sound...but may be a bit too loud for my liking. The most offending issue is a pretty load drone at 1400 RPM or so...

I rode in a friends coach today and was pleasantly surprised at how much quieter it was... smaller mufflers underneath and 3" pipes. And a nice insulated aluminum engine cover vs my original wooden deck.

So here's the questions:

Are mufflers the major component of any noise generation ?? Especially that drone...

Is 3" exhaust piping a major noise reducer ??

Might that insulated aluminum engine hatch be introducing significant noise reduction ?

Any trickery for eliminating the drone noise ?

Might a single muffler system be a solution ??

As always, THANK YOU for all of the advice offered here. It's been a tremendous help and inspiration for me during the "modernization" of my 23 footer.

http://www.gmcmhphotos.com/photos/data/6900/IMG_4297.PNG

Steve W
1973 23'
Southern California

Steve W 1973 : 23' Southern California

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[Message index]

		Exhaust Systems - Drone at 1400 RPM By: SteveW on Sun, 03 January 2016 22:34
		Re: [GMCnet] Exhaust Systems - Drone at 1400 RPM By: jimk on Sun, 03 January 2016 23:01
		Re: [GMCnet] Exhaust Systems - Drone at 1400 RPM By: <rallymaster on Mon, 04 January 2016 12:48
		Re: Exhaust Systems - Drone at 1400 RPM By: SteveW on Sun, 03 January 2016 23:46
		Re: Exhaust Systems - Drone at 1400 RPM By: djeffers on Mon, 04 January 2016 00:20
		Re: Exhaust Systems - Drone at 1400 RPM By: Bill Van Vlack on Mon, 04 January 2016 02:07
		Re: Exhaust Systems - Drone at 1400 RPM By: Matt Colie on Mon, 04 January 2016 06:53
		Re: Exhaust Systems - Drone at 1400 RPM By: Harry on Mon, 04 January 2016 07:47
		Re: Exhaust Systems - Drone at 1400 RPM By: JohnL455 on Mon, 04 January 2016 08:22
		Re: Exhaust Systems - Drone at 1400 RPM By: Carl S. on Mon, 04 January 2016 14:54
		Re: [GMCnet] Exhaust Systems - Drone at 1400 RPM By: James Hupy on Mon, 04 January 2016 15:11
		Re: [GMCnet] Exhaust Systems - Drone at 1400 RPM By: sgltrac on Mon, 04 January 2016 15:12
		Re: Exhaust Systems - Drone at 1400 RPM By: wally on Mon, 04 January 2016 15:01
		Re: [GMCnet] Exhaust Systems - Drone at 1400 RPM By: James Hupy on Mon, 04 January 2016 15:37
		Re: Exhaust Systems - Drone at 1400 RPM By: Larry on Tue, 05 January 2016 08:08
		Re: Exhaust Systems - Drone at 1400 RPM By: Ken Burton on Mon, 04 January 2016 16:13
		Re: Exhaust Systems - Drone at 1400 RPM By: TR 1 on Tue, 05 January 2016 09:45
		Re: Exhaust Systems - Drone at 1400 RPM By: Dennis S on Tue, 05 January 2016 11:22
		Re: Exhaust Systems - Drone at 1400 RPM By: George B. on Tue, 05 January 2016 15:14
		Re: Exhaust Systems - Drone at 1400 RPM By: JohnL455 on Wed, 06 January 2016 09:17
		Re: Exhaust Systems - Drone at 1400 RPM By: Larry on Wed, 06 January 2016 10:46
		Re: Exhaust Systems - Drone at 1400 RPM By: Bob de Kruyff on Wed, 06 January 2016 16:26

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