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Motorhome 440,,carb@intake,,what choice's
#967938
04/06/11 06:49 PM
04/06/11 06:49 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
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OP
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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I have the origional intake and thermo quad on my 76 Winnie and just not satisfied with the way it work's or performs,intake is a smogger unit and the TQ has surging issues, seem's like the motor starts out pulling good when you first hit the gas and then flattens out after about 30 ft of travel and seem's lazy after that and get a whopping 4.5 mpg,,this thing need's help and would like some suggestions on a carb and intake selection. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dartman366]
#967940
04/06/11 08:20 PM
04/06/11 08:20 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I have a 78 mh 440 that had a stock smogger intake and thermobog swaped it for a weiand action plus with a 650cfm carter performance carb of course shaveing 60 foot of MH,adding the intake carb,striping down a short bed truck adding 3.91sg,manual VB,mono spring with lift bars it got plenty of torque with a stock 440,i am sure i will get a little better mpgs than that or try a Q-jet,holley spredbore 650 double pumper thermobog replacement those both worked good on mine when first getting it running 
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dartman366]
#967942
04/06/11 08:29 PM
04/06/11 08:29 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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You have a fuel delivery problem. It's delivering the wrong kind of fuel. 
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: feets]
#967944
04/06/11 09:26 PM
04/06/11 09:26 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
You have a fuel delivery problem.
It's delivering the wrong kind of fuel.
 Yeah ain't that the truth,, but it is what it is and I have to deal with it, this Thermo was sent out and rebuilt by what was supposed to be people that knew them, this thing cold start's and idles perfect, and rev's with no stumble's or issues but has what I would call a surge under load, the previous two owner's both said they rebuilt the carb and still had the same issue as me, so I think the carb has issues,,,Doc I will get you a carb number in the morning, but as far as I know it is origional to the motorhome, and also it has a set of headers and dual's so no heat riser.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dartman366]
#967945
04/06/11 09:30 PM
04/06/11 09:30 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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hey on the bright side,,,I did get the gas guage fixed today,,,and you won't in your wildest dream's guess what was wrong. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dartman366]
#967946
04/06/11 10:02 PM
04/06/11 10:02 PM
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Joined: Nov 2006
Posts: 396
California, USA
Phil Saran
enthusiast
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enthusiast
Joined: Nov 2006
Posts: 396
California, USA
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You were missing the ground strap on the fuel line at the
gas tank?
If you are going to make changes and you don't have to
worry too much about smog stuff go with a Edelbrock Performer
intake and carb.
Phil Saran
Parker, Colorado
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: Phil Saran]
#967947
04/06/11 10:23 PM
04/06/11 10:23 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
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OP
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Mt. Vernon, Ohio
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actually,,,,,just the opposite, there was a wierd looking bracket laying on top of the tank across the sending unit post and grounding it out, I was in process of taking the tank out to put in a new sending unit and was investigating what I needed to do to get it out and noticed this bracket just lsying there on top of the tank so I took it off and tried the guage for the heck of it,,,,,and it worked. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dartman366]
#967948
04/06/11 10:36 PM
04/06/11 10:36 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Doc I will get you a carb number in the morning, but as far as I know it is origional to the motorhome, and also it has a set of headers and dual's so no heat riser.
d-man ... it sounds like there is an issue on the primary side of the carb ...with surging. PROBABLY the wrong size rods in it.
I would suggest getting a spark plug reading at diff stages of running ...or BETTER YET .. put a wide-band 02 on it.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dOc !]
#967949
04/06/11 10:41 PM
04/06/11 10:41 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
Quote:
Doc I will get you a carb number in the morning, but as far as I know it is origional to the motorhome, and also it has a set of headers and dual's so no heat riser.
d-man ... it sounds like there is an issue on the primary side of the carb ...with surging. PROBABLY the wrong size rods in it.
I would suggest getting a spark plug reading at diff stages of running ...or BETTER YET .. put a wide-band 02 on it.
don't know anybody that has a wide band,,,is there any good reference book's that would tell me what I should have in it,,,,,,,guess I should of bought that $20.00 swap meet thermo after all.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dartman366]
#967950
04/06/11 11:15 PM
04/06/11 11:15 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
don't know anybody that has a wide band,,,is there any good reference book's that would tell me what I should have in it,,,,,,,guess I should of bought that $20.00 swap meet thermo after all.
I don't have a wide-band yet either ... but I am going to get one.
The surging and poor mpg really don't go together(surging is lean - poor mpg is rich) ...uNless the carb tuning is totally messed up. At what speed is the surging taking place ?
Get a normal speed and high-speed read on the plugs for now. And you can ALWAY do better on the intake manifold.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dOc !]
#967953
04/06/11 11:42 PM
04/06/11 11:42 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
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OP
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Mt. Vernon, Ohio
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all new filters and new fuel pump, checked for kink's and smashed lines too.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dOc !]
#967955
04/06/11 11:59 PM
04/06/11 11:59 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
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OP
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Quote:
HOW did the filters look? ... metal ones ? ....did you pull em apart?
one at the carb was steel, small amount of verry verry fine silt came out, each tank has a clear chrysler type inline and they looked good like they had just been changed.  but I changed them anyway.
Last edited by dartman366; 04/07/11 12:00 AM.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Motorhome 440,,carb@intake,,what choice's
[Re: dOc !]
#967957
04/07/11 12:26 AM
04/07/11 12:26 AM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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