| [GMCnet] Transit Pipes [message #134281] |
Tue, 12 July 2011 08:34  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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All points considered, I think I'm just going to order in an exhaust and bolt it up and be done with it.
Thanks for the tips and the suggestions.
Dolph
Dolph Santorine wrote on Mon, 11 July 2011 21:56
> Has anyone fashioned "transit pipes" coming off the stock exhaust manifolds?
This was discussed with Martha's possum rescue plan. You can build a set but then you end up needing to eventually build a real exhaust, so all the time cobbling something up is wasted. Better to just break down and do it right in the first place. It really does not take all that long. You could use standard NAPA 2.5" pipe and standard bends to do what you have to. I'm not sure how you connect to the manifold, though.
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| Re: [GMCnet] Transit Pipes [message #134329 is a reply to message #134281] |
Tue, 12 July 2011 12:17  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| Dolph Santorine wrote on Tue, 12 July 2011 08:34 |
All points considered, I think I'm just going to order in an exhaust and bolt it up and be done with it.
Thanks for the tips and the suggestions.
Dolph
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Dolph,
If you are doing this at a distance from home and the coach has no existing system -- are you familiar with the silicone donuts that most GMC exhaust systems used to support the ling exhaust pipe? (very early 73 coaches used a different system) The donuts may or may not need replacing.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Transit Pipes [message #134409 is a reply to message #134329] |
Tue, 12 July 2011 20:31 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Senior Member |
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Dennis:
You hit the nail on the head, and I'm not familiar with them.
Where's the best place to get smart about it?
Dolph
On Jul 12, 2011, at 1:17 PM, Dennis Sexton wrote:
>
>
> Dolph Santorine wrote on Tue, 12 July 2011 08:34
>> All points considered, I think I'm just going to order in an exhaust and bolt it up and be done with it.
>>
>> Thanks for the tips and the suggestions.
>>
>> Dolph
>
>
> Dolph,
>
> If you are doing this at a distance from home and the coach has no existing system -- are you familiar with the silicone donuts that most GMC exhaust systems used to support the ling exhaust pipe? (very early 73 coaches used a different system) The donuts may or may not need replacing.
>
> Dennis
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
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| Re: [GMCnet] Transit Pipes [message #134417 is a reply to message #134409] |
Tue, 12 July 2011 21:31 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Dolph,
Do you have a parts manual? If not, go here
http://www.bdub.net/manuals/parts/GMCMH-Parts.pdf
look under fuel, section 12.030 for the exhaust system. it has illustrations of the first style and the later style with the silicone donuts. The original pipes were 2 1/2 inch and went through a short section of 3 inch that fit through the silicone donuts.
You don't say whether you plan to use the original exhaust manifolds or go to headers, or if you want a 3 inch exhaust system or to stay with the original 2 1/2 inch.
Go here to see what JimK has to offer and of course if you buy from him he has the other bits you may need..
http://appliedgmc.com/level.itml/icOid/488
Gene has some info to read..
http://gmcmotorhome.info/engine.html#manifold
and visit the photo site and search for exhaust to get lots of ideas..
http://gmcmhphotos.com/photos/
So, you have a lot to look over and study.
When you come back, tell us more about the coach, and what you may need to do -- then we may be better able to advise you.
Dennis
| Dolph Santorine wrote on Tue, 12 July 2011 20:31 |
Dennis:
You hit the nail on the head, and I'm not familiar with them.
Where's the best place to get smart about it?
Dolph
On Jul 12, 2011, at 1:17 PM, Dennis Sexton wrote:
>
>
> Dolph Santorine wrote on Tue, 12 July 2011 08:34
>> All points considered, I think I'm just going to order in an exhaust and bolt it up and be done with it.
>>
>> Thanks for the tips and the suggestions.
>>
>> Dolph
>
>
> Dolph,
>
> If you are doing this at a distance from home and the coach has no existing system -- are you familiar with the silicone donuts that most GMC exhaust systems used to support the ling exhaust pipe? (very early 73 coaches used a different system) The donuts may or may not need replacing.
>
> Dennis
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Transit Pipes [message #134438 is a reply to message #134426] |
Wed, 13 July 2011 07:45 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| WD0AFQ wrote on Tue, 12 July 2011 23:10 |
Good pictures Dennis. Thanks for the reminder. I need to get one of these from Jim K.
Dan
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Dan,
As I recall you want to add a donut at the front (under the entry door area) -- which would require seperating the exhaust pipe. Do you still have the metal mounting ring? We have discussed -- on the forum -- the idea of splitting the mounting and the donut. But I don't know if anyone has ever done so. Sure would make it easier to install one after the exhaust was is place.
Oh, and one more link to an exhaust system -- and billet silicone mounting rings.
http://www.cathy-ron.com/GMC%20Finished%20Chassis%20%26%20Exhaust.html
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Transit Pipes [message #134477 is a reply to message #134469] |
Wed, 13 July 2011 15:14 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| WD0AFQ wrote on Wed, 13 July 2011 12:52 |
I just changed the oil and had a good look at mine. There is a donut in the second cross frame member but not one in the first. Teri complains about the "thumping" that the pipe does, sometimes, when I start it up. I have Jim's 3 inch pipes with the band clamps. I believe that I can slide one on and bolt it up with out cutting it in half. There is a clamp in front and one behind this first cross member. So, I kinda hate to cut one if I don't need to. What you say Rob makes all the sense in the world about only cutting the gasket once and the frame for it twice.
Many times folks come up to Jim's table, pick one of these up, and ask what it is. My response is that they are getting a firsthand look at one of the new muffler bearings. So, if you need one at Goshen, just ask for a "muffler bearing". This will get you one of these.
Dan
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Dan,
The y pipe parralels that crossmember so closely that when it bends through there is not a not of room to have a mounting. Can you enlarge the opening slightly to improve clearance?
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Wed, 13 July 2011 15:16] Report message to a moderator |
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| Re: [GMCnet] Transit Pipes [message #134561 is a reply to message #134541] |
Thu, 14 July 2011 08:34 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| WD0AFQ wrote on Wed, 13 July 2011 23:08 |
Dan,
The y pipe parralels that crossmember so closely that when it bends through there is not a not of room to have a mounting. Can you enlarge the opening slightly to improve clearance?
Dennis
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Really? So, there should not be one on the most forward cross frame, but the second only? It does not rattle all of the time, just occassionally.
Dan[/quote]
Dan,
Correct, originally the mounts are at the second crossmember.
Perhaps you would be better served with a flexible exhaust piece in the Y pipe. Adding more rigidity to your existing system might cause some problems.
Here is the link again -- showing a flex connection..
http://www.cathy-ron.com/GMC%20Finished%20Chassis%20%26%20Exhaust.html
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Thu, 14 July 2011 08:37] Report message to a moderator |
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