| And another muffler question / discussion [message #315594] |
Fri, 07 April 2017 09:39  |
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SteveW
Messages: 538
Registered: June 2005
Location: Southern California - Ora...
Karma: 1
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A recent discussion about mufflers and crossovers reminded me that I also have a muffler question to pose...
1973 23 footer. Stock exhaust configuration - two mufflers into one long pipe to the rear. Well... stock except for headers.
The issue is an irritating drone at 1400 - 1600 rpm.
Anyone have any trickery to eliminate it ??
Thanks,
Steve W
Southern California
Steve W
1973 : 23'
Southern California
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| Re: And another muffler question / discussion [message #315598 is a reply to message #315594] |
Fri, 07 April 2017 10:41  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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SteveW wrote on Fri, 07 April 2017 07:39A recent discussion about mufflers and crossovers reminded me that I also have a muffler question to pose...
1973 23 footer. Stock exhaust configuration - two mufflers into one long pipe to the rear. Well... stock except for headers.
The issue is an irritating drone at 1400 - 1600 rpm.
Anyone have any trickery to eliminate it ??
Thanks,
Steve W
Southern California
Maybe add a small resonator somewhere in the system? I don't know enough about exhaust system design to recommend placement.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: And another muffler question / discussion [message #315613 is a reply to message #315594] |
Fri, 07 April 2017 18:36 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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You could try inserting an auger muffler in the cross pipe after the mufflers. It had been stated on the net/forum that this had eleiminated a nasty drone on a three inch system with a rear muffler.. I can't vouch for this as I installed one from the get go on my system.
They are cheap and relatively easy to install so give it a try before spending any significant bucks.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: And another muffler question / discussion [message #315634 is a reply to message #315594] |
Sat, 08 April 2017 09:24 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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SteveW wrote on Fri, 07 April 2017 10:39A recent discussion about mufflers and crossovers reminded me that I also have a muffler question to pose...
1973 23 footer. Stock exhaust configuration - two mufflers into one long pipe to the rear. Well... stock except for headers.
The issue is an irritating drone at 1400 - 1600 rpm.
Anyone have any trickery to eliminate it ??
Thanks,
Steve W
Southern California
Steve,
As I have a similar coach, I find it hard to believe that what you are hearing is an exhaust note. But it is very easy to believe that the exhaust system is slightly out of place and so is drumming on the frame somewhere. If that can be the case, it might be hard to find, but it can also be easy to find if yo spend some time under the coach and look for possible strike marks on the exhaust system.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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