| Blown Mufflers replaced with Single Spin-Tech [message #187358] |
Mon, 15 October 2012 17:18  |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Was coasting down a long hill on my way to MGM GMC for some maintenance & the engine started to backfire blowing out one muffler. Turned out my old points ignition failed and caused the backfiring. Miguel recommended replacing the ignition with a Pertronix Flame-Thrower D1100 and replace the blown dual Flowmaster mufflers with a single Spin-Tech 8743. Take a look at my You-Tube link below to see and hear the new muffler. Also take a look at my burnt floor from the old mufflers. Guess I need a shield of some kind under there.
Link to You-Tube:
http://www.youtube.com/watch?feature=player_detailpage&v=kKpKsKLFXgM
Hope this works, never did this before!
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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| Re: Blown Mufflers replaced with Single Spin-Tech [message #187368 is a reply to message #187358] |
Mon, 15 October 2012 18:17  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| George B. wrote on Mon, 15 October 2012 17:18 |
Was coasting down a long hill on my way to MGM GMC for some maintenance & the engine started to backfire blowing out one muffler. Turned out my old points ignition failed and caused the backfiring. Miguel recommended replacing the ignition with a Pertronix Flame-Thrower D1100 and replace the blown dual Flowmaster mufflers with a single Spin-Tech 8743. Take a look at my You-Tube link below to see and hear the new muffler. Also take a look at my burnt floor from the old mufflers. Guess I need a shield of some kind under there.
Link to You-Tube:
http://www.youtube.com/watch?feature=player_detailpage&v=kKpKsKLFXgM
Hope this works, never did this before!
|
George,
Thank you for sharing the video -- well done.
When going to the single muffler should a heat shield be considered on the older coaches with the wooden floors?
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Blown Mufflers replaced with Single Spin-Tech [message #187369 is a reply to message #187358] |
Mon, 15 October 2012 18:24 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Worked well.
Coach is looking good! Seems a bit shinier than it was a year ago at WS.
While it might be just the camera angles, I only see charred flooring over the space of the passenger muffler. Normally this indicates a blocked DRIVER's side muffler... and over heating of the crossover in the intake manifold. (At sometime in the past.) While you have fixed the muffler, it is something to keep in mind.
Nice sound. A second rear mounted muffler might reduce the sound level without messing up the tone.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Blown Mufflers replaced with Single Spin-Tech [message #187398 is a reply to message #187358] |
Mon, 15 October 2012 22:29 |
UziYaH
Messages: 282
Registered: July 2007
Location: 10-O-C
Karma: 0
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Worked great. Good looking coach. Nice video. Thanks for sharing.
Howard Nylander
Royale Class of '78'
Greeneville, Tn. (formally from Thousand Oaks, CA.)
________________________________
From: GEORGE BUTTS <george.b21@verizon.net>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 15, 2012 6:18 PM
Subject: [GMCnet] Blown Mufflers replaced with Single Spin-Tech
Was coasting down a long hill on my way to MGM GMC for some maintenance & the engine started to backfire blowing out one muffler. Turned out my old points ignition failed and caused the backfiring. Miguel recommended replacing the ignition with a Pertronix Flame-Thrower D1100 and replace the blown dual Flowmaster mufflers with a single Spin-Tech 8743. Take a look at my You-Tube link below to see and hear the new muffler. Also take a look at my burnt floor from the old mufflers. Guess I need a shield of some kind under there.
Link to You-Tube:
http://www.youtube.com/watch?feature=player_detailpage&v=kKpKsKLFXgM
Hope this works, never did this before!
--
George Butts
Apple Valley Calif.
73 "Custom 26 Q"
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GMCnet mailing list
Unsubscribe or Change List Options:
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Howard Nylander
Royale Class of "78" "Rocinate"
E-10-o-C
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| Re: [GMCnet] Blown Mufflers replaced with Single Spin-Tech [message #187413 is a reply to message #187358] |
Mon, 15 October 2012 23:56 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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That is the identical muffler and placement I put on TheWarPig. Fits well, sounds good. Miguel steered us both right ;)
Sully
77 royale
Seattle, wa
Sent from my iPhone
On Oct 15, 2012, at 3:18 PM, GEORGE BUTTS <george.b21@verizon.net> wrote:
>
>
> Was coasting down a long hill on my way to MGM GMC for some maintenance & the engine started to backfire blowing out one muffler. Turned out my old points ignition failed and caused the backfiring. Miguel recommended replacing the ignition with a Pertronix Flame-Thrower D1100 and replace the blown dual Flowmaster mufflers with a single Spin-Tech 8743. Take a look at my You-Tube link below to see and hear the new muffler. Also take a look at my burnt floor from the old mufflers. Guess I need a shield of some kind under there.
>
> Link to You-Tube:
> http://www.youtube.com/watch?feature=player_detailpage&v=kKpKsKLFXgM
>
> Hope this works, never did this before!
>
>
> --
> George Butts
> Apple Valley Calif.
> 73 "Custom 26 Q"
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Blown Mufflers replaced with Single Spin-Tech [message #187471 is a reply to message #187369] |
Tue, 16 October 2012 14:34 |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Mike:
You are right, the charred floor is only on the passenger side and was there before I owned the coach.
The engine was rebuilt for the PO some time ago by Bob Lamey so the crossover may have been plugged at that time. Is there a non-intrusive way to determine if it is plugged?
PS: Glad you remembered our coach!
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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| Re: Blown Mufflers replaced with Single Spin-Tech [message #187486 is a reply to message #187358] |
Tue, 16 October 2012 16:37 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| George B. wrote on Mon, 15 October 2012 17:18 |
Take a look at my You-Tube link below to see and hear the new muffler. Also take a look at my burnt floor from the old mufflers. Guess I need a shield of some kind under there.
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A shield is kinda one of those "can't hurt" items. No downside so just do it. Some have used baking pans. If nothing else just some sheet metal spaced off the floor by a few washers will cut down on the radiated heat.
As far as determining if the manifold was blocked off or not just get an infrared thermometer and, with the engine running and hot, scan the intake. If the crossover is not blocked the manifold will be much hotter there than elsewhere. Another way to check is to see if you still have the carb heat stove connection on the intake manifold. On mine that area was easy to determine by the burned paint on the manifold. (Also by the charred acorns I found when I first got the coach. See here:
http://www.gmcmhphotos.com/photos/engine-room-b4/p33689-engine-comp-critter-ev.html
)
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Blown Mufflers replaced with Single Spin-Tech [message #187510 is a reply to message #187471] |
Tue, 16 October 2012 19:09 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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George,
The OEM choke has a tube that goes into the crossover; if it has been blocked there will be a wire connected to the choke.
Regards,
Rob M.
-----Original Message-----
From: GEORGE BUTTS
Mike:
You are right, the charred floor is only on the passenger side and was there before I owned the coach.
The engine was rebuilt for the PO some time ago by Bob Lamey so the crossover may have been plugged at that time. Is there a
non-intrusive way to determine if it is plugged?
PS: Glad you remembered our coach!
--
George
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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