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02-02-2010, 03:32 PM
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#1
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Senior Member
Join Date: Oct 2007
Location: Huntington WV
Posts: 1,041
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Generator Isolation Mount
I am toying with the idea of putting my gennie on air bags to reduce the low freq vibration in the coach. I am curious as to how Newell handled the exhaust routing using that setup. Somehow you have to account for the generator moving up and down with a flex coupling on the exhaust. I would like to know how Newell did that and retained the slide in and out capability. I know how most Prevost conversions do it, but it requires that you disconnect the exhaust to get the gennie to slide out. I really don't want to crawl under the coach to release the generator.
If you know, or you can take pictures of this airbag setup if you have it, would you mind pointing me in the right direction?
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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02-02-2010, 04:27 PM
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#2
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Senior Member
Join Date: Mar 2007
Location: mesa, az
Posts: 1,375
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right on,
i have wondered the same thing many times. however, the way my exhaust that has a pipe slide inside a pipe is very sensitive to position and will bind up easily not allowing the genny to come out. i know that because i tried to adjust it to provide the least amount of vibration noise.
the other thing is that the front body panel is very closely aligned. since it is attached to the genny, if the genny bounced up and down much on the mounts, it would hammer the body panel on front.
someone who has airbag genny mounts should be able to tell us easily
tom
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02-02-2010, 08:10 PM
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#3
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Senior Member
Join Date: Oct 2007
Location: Huntington WV
Posts: 1,041
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A little more info. What sealed the deal was sitting in a Prevost conversion with the gennie running. When if first fired, it felt and sounded just like mine. A low freq rumble coming from the floor. When the air bags filled the sound went away. I could barely tell it was running.
I found the airbags and talked to some gennie experts to learn to have to have two pressure regulators. One for the front and one for the back since the gennie is rear end heavy you run two different pressures to keep it level.
However, none of the gennie experts I talked to had any suggestions about how to isolate the pipe within a pipe system Newell uses for the slide out.
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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02-02-2010, 08:25 PM
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#4
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Senior Member
Join Date: Mar 2007
Location: mesa, az
Posts: 1,375
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richard,
what about my other concern? that the outside panel that bolts to the front of the radiator frame? if it moves up and down with an airbag, i dont see how that isnt going to smash that panel all up?
tom
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02-02-2010, 08:29 PM
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#5
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Senior Member
Join Date: May 2006
Location: Houma, LA
Posts: 886
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Richard,
My generator is mounted on air bags. If I remember correctly there are 4, one on each corner. When the generator is running you can feel it from the driver's/passenger seat.
It's not excessively noisey, but you can hear it running.
The Prevosts have their generators mounted in the middle of the bus and you are correct they are very quiet. They use a good deal of sound deadening material. Prevosts install the generator radiator in a separate bay from the generator engine. I don't know if that reduces the noise in some way, but it might!
If I remember correctly my 1993 Newell had air bags on the generator. I am surprised that your 1995 doesn't have the air bags. That's odd.
__________________
Tuga & Karen Gaidry
1999 Newell 45 w/2 slides
Coach #512
2005 Pilot
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02-02-2010, 09:23 PM
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#6
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Senior Member
Join Date: Sep 2008
Location: Thibodaux, LA
Posts: 1,221
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Made me look, my 93 has rubber mounts.
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02-03-2010, 03:06 AM
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#7
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Senior Member
Join Date: Mar 2006
Location: Indiana
Posts: 424
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My '93 has air bags with an air pressure regulator. The gen exhaust is through the roof about mid way back on the drivers side. The gen exhaust pipe has an "S" shaped section of flex pipe that bends to allow the gen to slide in and out. I've noticed that both of my Newells gens are quieter and smoother after they get warmed up....a characteristic of a diesel engine.
The gen in my '78 (a Kohler/Perkins) had an annoying "knocking " sound. I just thought that was typical for a diesel engine. After investigating I found that one of the bolts that hold the fuel injector in was slightly loose. After tightening it down the noise was reduced.
__________________
1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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02-03-2010, 03:17 AM
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#8
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Senior Member
Join Date: Mar 2006
Location: Indiana
Posts: 424
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Oh, and yes Tuga you are right. I did some research before I reworked the gen compartment on my '78. By remote mounting the radiator the Prevost converter can more completely seal the engine bay thus minimizing engine sound emissions. Squirrel-cage fans and carefully "ducting" incoming and outgoing air also reduce noise emission.
__________________
1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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02-03-2010, 03:43 AM
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#9
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Senior Member
Join Date: Mar 2007
Location: mesa, az
Posts: 1,375
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dean,
i understand now the flex hose for exhaust, though i am not sure where to actually get it.
that said, i am still curious as to how the front body panel that is bolted to the front of the radiator wouldnt go up and down with the air bags causing it to bind when fully in and flush with the front.
tom
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02-03-2010, 12:26 PM
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#10
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Senior Member
Join Date: Mar 2006
Location: Indiana
Posts: 424
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Hi Tom,
There are two frames. The engine/radiator is mounted to a frame.
That assembly is mounted to the sliding frame via 4 air bags. The front cover/body panel is solid mounted to the sliding frame seperately just in front of the radiator. The cover/body panel only slides in/out with the sliding frame.
__________________
1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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02-03-2010, 01:01 PM
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#11
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Senior Member
Join Date: Oct 2007
Location: Huntington WV
Posts: 1,041
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Tom,
My thinking was the radiator remained hard bolted to the slide carriage, the motor and generator floated on the air bags, the rubber coolant hoses should allow for an inch of flex or so.
I am very interested about the location of the flex. Is it between the generator exhaust and the pipe that slides into the exhaust system. Or is it part of the stationary exhaust system.
Seems to me in order to isolate the vibration, then both the generator vibrations have to be isolated from the coach. The air bags are obvious, but the exhaust system must be isolated as early as possible.
Tuga or Dean, if you could take a pic when it is convenient, I would appreciate it.
Thanks,
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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02-03-2010, 11:07 PM
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#12
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Senior Member
Join Date: May 2006
Location: Houma, LA
Posts: 886
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Richard,
I will take some pictures tomorrow. It is supposed to rain, so it the pictures may not be too good. But I will do my best.
__________________
Tuga & Karen Gaidry
1999 Newell 45 w/2 slides
Coach #512
2005 Pilot
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02-04-2010, 12:49 AM
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#13
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Senior Member
Join Date: Oct 2007
Location: Huntington WV
Posts: 1,041
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Thanks Tuga, don't put yourself in the wet. It was yucky here today. I am in no hurry. Just one of those things that you get to thinking about when the weather is too cold to go out and play.
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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02-04-2010, 02:15 AM
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#14
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Senior Member
Join Date: Mar 2006
Location: Indiana
Posts: 424
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Correction
I need to correct my earlier post. I was thinking of the mount setup on my '78 Newell.
Richard is right. My engine is mounted on the air bags and the radiator is rigid mounted. This pic is of my '93.
__________________
1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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02-04-2010, 02:11 PM
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#15
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Senior Member
Join Date: Oct 2007
Location: Huntington WV
Posts: 1,041
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HoosierDaddy,
Can you get a pic of the exhaust flex coupling?
Thanks
R
__________________
Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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