Home » Public Forums » GMCnet » shortened exaust system.is this good for engine ??
| shortened exaust system.is this good for engine ?? [message #153922] |
Wed, 21 December 2011 13:43  |
glacierfl
Messages: 444
Registered: June 2011
Karma: 0
|
Senior Member |
|
|
Hello,
I saw a GMC with a shortened exaust syatem.
The pipes came out under the body a few feet behind the drivers seat, with i think a stainless steel guard fitted.
Would seem a good idea to stop heating up the underside, fuel tanks etc.
Also running the engine while in the back bedroom, you would not have to worry so much about engine exaust fumes getting in the back sectiom.
Yes i know the gen is a problem also, that seems to have been solved with a long extension pipe, that takes the fumes way inro the air.
While on this topic, on the spares coach a 1973, the wooden box covering the Gen was leaking all over the place, allowing CO fumes into the back section.........
If you have an early coach make sure you seal it totally ....
Back on topic :-
I did wonder if the shortened length of the exaust system, could have any detrimental effect on the engine ??. With the shortened lengh, one would think, that a difference in pressure could result ???
Knowing next to nothing about exaust systems, i thought some of you out there would have some good advice on this topic.
cheers and beers
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
|
|
|
|
| Re: [GMCnet] shortened exaust system.is this good for engine ?? [message #153927 is a reply to message #153922] |
Wed, 21 December 2011 13:51  |
 |
ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
|
Senior Member |
|
|
Steve & Debbie,
I'm no expert, but from reading this forum I know that some have done it. Some of those who have done it have reinstalled a traditional rear exhaust. The problems that I recall are exhaust gasses entering the side windows and door.
It seems to me that the current trend of 3" exhaust and a single rear muffler is the way to go. I don't think there are any benefits to our slow RPM motors of a short exhaust and the heat issues have been dealt with, mostly.
Just my 2 cents.
Larry Davick
Fremont, California
The Mystery Machine
'76 (ish) Palm Beach
----- Original Message -----
From: "steve & debbie" <@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, December 21, 2011 11:43:08 AM
Subject: [GMCnet] shortened exaust system.is this good for engine ??
Hello,
I saw a GMC with a shortened exaust syatem.
The pipes came out under the body a few feet behind the drivers seat, with i think a stainless steel guard fitted.
Would seem a good idea to stop heating up the underside, fuel tanks etc.
Also running the engine while in the back bedroom, you would not have to worry so much about engine exaust fumes getting in the back sectiom.
Yes i know the gen is a problem also, that seems to have been solved with a long extension pipe, that takes the fumes way inro the air.
While on this topic, on the spares coach a 1973, the wooden box covering the Gen was leaking all over the place, allowing CO fumes into the back section.........
If you have an early coach make sure you seal it totally ....
Back on topic :-
I did wonder if the shortened length of the exaust system, could have any detrimental effect on the engine ??. With the shortened lengh, one would think, that a difference in pressure could result ???
Knowing next to nothing about exaust systems, i thought some of you out there would have some good advice on this topic.
cheers and beers
--
Steve & Debbie
Monticello, FL
77 Palm Beach :- Aurora
EX G4WDT
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
|
|
|
|
| Re: shortened exaust system.is this good for engine ?? [message #153934 is a reply to message #153922] |
Wed, 21 December 2011 14:17 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
""I did wonder if the shortened length of the exaust system, could have any detrimental effect on the engine ??. With the shortened lengh, one would think, that a difference in pressure could result ???
""
In our GMC it's not going to make much difference for the engine itself, but as others will point out, there are other parts of the coach that may care.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
|
|
|
|
| Re: [GMCnet] shortened exaust system.is this good for engine ?? [message #154001 is a reply to message #153981] |
Wed, 21 December 2011 21:23 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Steve,
I bought it here all registered and running here. Then I made the BIG mistake of deciding to "make it better" and I'm still not
done! I shoulda fixed all the mechanical issues and used it!
That was really dumb! However, to demonstrate that I am not stupid I DID NOT repeat that mistake with Double Trouble!
At one time I found 14 GMC's here in Australia I reckon that count is now up to around 25.
Regards,
Rob M.
-----Original Message-----
From: steve & debbie
Hello Rob,
Yeah likely there is some restriction or other, of which i am not aware, some of which are for our benefit !!!!
By Dingo :), how did you get a GMC in Australia ????.
I guess GMC motorhomes, must be as rare as hens teeth over there...
cheers and beers
Steve & Debbie
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: [GMCnet] shortened exaust system.is this good for engine ?? [message #154025 is a reply to message #154001] |
Thu, 22 December 2011 01:45 |
peter bailey
Messages: 367
Registered: March 2009
Location: Gawler, South Australia
Karma: 0
|
Senior Member |
|
|
Rob,
We will have to confer the GMC numbers known in Australia I am stuck on 14
so I would like your insight as to who and where are the other 11 that have
eluded me.
4 in Queensland
2 in New South Wales
2 in Victoria ( 1 which has been completely customised)
2 in Tasmania
3 in South Australia
1 in Western Australia
Peter Bailey
from Ozy (Aussie)
----- Original Message -----
From: "Rob Mueller" <robmueller@iinet.net.au>
To: <gmclist@temp.gmcnet.org>
Sent: Thursday, December 22, 2011 1:53 PM
Subject: Re: [GMCnet] shortened exaust system.is this good for engine ??
> Steve,
>
> I bought it here all registered and running here. Then I made the BIG
> mistake of deciding to "make it better" and I'm still not
> done! I shoulda fixed all the mechanical issues and used it!
>
> That was really dumb! However, to demonstrate that I am not stupid I DID
> NOT repeat that mistake with Double Trouble!
>
> At one time I found 14 GMC's here in Australia I reckon that count is now
> up to around 25.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: steve & debbie
>
> Hello Rob,
>
> Yeah likely there is some restriction or other, of which i am not aware,
> some of which are for our benefit !!!!
>
> By Dingo :), how did you get a GMC in Australia ????.
>
> I guess GMC motorhomes, must be as rare as hens teeth over there...
>
> cheers and beers
>
> Steve & Debbie
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.1890 / Virus Database: 2109/4693 - Release Date: 12/20/11
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
| Re: shortened exaust system.is this good for engine ?? [message #154040 is a reply to message #153922] |
Thu, 22 December 2011 08:53 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
| glacierfl wrote on Wed, 21 December 2011 14:43 |
Hello,
I saw a GMC with a shortened exaust syatem.
The pipes came out under the body a few feet behind the drivers seat, with i think a stainless steel guard fitted.
Would seem a good idea to stop heating up the underside, fuel tanks etc.
Also running the engine while in the back bedroom, you would not have to worry so much about engine exaust fumes getting in the back sectiom.
Yes i know the gen is a problem also, that seems to have been solved with a long extension pipe, that takes the fumes way inro the air.
While on this topic, on the spares coach a 1973, the wooden box covering the Gen was leaking all over the place, allowing CO fumes into the back section.........
If you have an early coach make sure you seal it totally ....
Back on topic :-
I did wonder if the shortened length of the exaust system, could have any detrimental effect on the engine ??. With the shortened lengh, one would think, that a difference in pressure could result ???
Knowing next to nothing about exaust systems, i thought some of you out there would have some good advice on this topic.
cheers and beers
|
Steve,
While air flow (both ends) is critical to engine performance, at the speed ranges that we run, it will make little if any difference.
Could it hurt the engine?
Not likely. If the mufflers have been replaced with something with vastly different flow characteristics, this may (MAY) affect the apparent mixture that the carburetor delivers.
If you are worried about reversion causing exhaust intrusion, the easy fix is don't run the main engine when not moving. You should never being doing this anyway, so I see this as a big non-issue. I would worry more about reversion with a side exhaust exit.
As to the heat under the vehicle. That can be improved, but the book is still open on how much it helps with respect to the other possible mods that are known to work and work very well.
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
|
|
|
|
| Re: shortened exaust system.is this good for engine ?? [message #154042 is a reply to message #153922] |
Thu, 22 December 2011 09:14 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
Karma: 0
|
Senior Member |
|
|
Why not header wrap back will the tail pipe? Aren't you trying to get the heat out of the exhaust? I hear commonly it will crack manifolds but I know myself and several people that have done this for years and years never having a issue.
I want to extend my generator exhaust, I HATE the smell. I think generators are the worst. Nothing like dry camping hearing the generators. I'm really hoping soon only to ever use it as a super emergency backup. But till then I want to extent the pipe. I saw a parts store who sells a flexible one. Maybe I'll buy it and put it on when in use.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] shortened exaust system.is this good for engine ?? [message #154062 is a reply to message #154057] |
Thu, 22 December 2011 12:54 |
 |
hnielsen2
Messages: 1434
Registered: February 2004
Location: Alpine CA
Karma: 0
|
Senior Member |
|
|
You can also build your own.
Information on the web.
Howard
----- Original Message -----
From: "Don Adams" <dj.adams@att.net>
To: <gmclist@temp.gmcnet.org>
Sent: Thursday, December 22, 2011 10:22
Subject: Re: [GMCnet] shortened exaust system.is this good for engine ??
>
>
> Dan Borlase wrote on Thu, 22 December 2011 11:29
>> ...I bought Camping World's generator exhaust extention...works
>> incredibly well....$130. bucks and comes with a storage bag.
>> Wow...I should get a commission from these guys :lol:
>
>
>
> Dan is that the vertical "gen-turi" vertical stack?
>
> --
> Don
> Dallas, TX
> 1976 26' Glenbrook
> rebuilt by R Archer
> powered by J Bounds, Koba
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
All is well with my Lord
|
|
|
|
Goto Forum:
Current Time: Sat Nov 16 14:41:23 CST 2024
Total time taken to generate the page: 0.01452 seconds
|
GMCforum
Search
Help
Register
Login
Home
, how did you get a GMC in Australia ????.
