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  #1  
Old December 8th, 2012, 07:32 PM
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what carbs ?

What are the carbs on an 83 3.5 ? Zenith/SU or Strombergs ? What model ?
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  #2  
Old December 8th, 2012, 08:55 PM
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Both types were used, at least both are in the parts manual. The Zenith and Stromberg are the same model, CD 175. The SU carbs are different. Kinda large bell-looking things. I don't know the model number, as I have CD 175's on mine.

Cheers,

Mike
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Old December 9th, 2012, 03:21 AM
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thanks. Any helpfull links to tuning them that you have found ? In searching the one thing I found said not to use carb cleaner down the throat to clean them as it would harm the diaphragm. These things are black inside. Truck sat for 8 years.
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  #4  
Old December 9th, 2012, 06:08 AM
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Quote:
Originally Posted by 130Tdi
thanks. Any helpfull links to tuning them that you have found ? .
Unbolt them and throw them in the trash

The su carbs I had in the past were a pita to keep running properly.

The only tip I can give you is to make sure they have oil in them other than that I gave up on trying to tune them or keep them in sync and took it to someone as I never was able to keep it running properly.
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Old December 9th, 2012, 12:08 PM
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yeah but I'm the kind of guy that will have to overcome that. Read on a UK forum where a guy changed a pair of springs and needle valves and his mileage shot up to 19 and the truck gained quite a bit of power. Guess I'll pull the pots and then spray them down with Berkible 2+2 gum cutter and see what that gets me. Seafoam didn't have a great deal of effect.
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  #6  
Old December 9th, 2012, 04:41 PM
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Quote:
Originally Posted by dave_lucas View Post
Unbolt them and throw them in the trash

The su carbs I had in the past were a pita to keep running properly.
,


I'm afraid it isn't quite that bad! The SU 1 3/4"
carb would be a far superior replacement to the existing Zenith Stromberg 175.
If you remove the top cover (4 screws) you can withdraw the carb damper with the attached rubber diaphram so then you can go to town with the carb cleaner on the bodies and throat. Check the rubber diaphram for any tears or punctures and replace if you find either.

The metering needles hang from the damper and will need to be removed (single screw on the side of the damper) to examine the actual needle ID number. Of course, having the correct needles for the RR application would be critical.

Parts and jetting info can be found by contacting Joe Curto , who is the carb expert for both the SU and ZS. www.joecurto.com

Feel free to contact me if I can help further
Pete
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  #7  
Old December 9th, 2012, 06:49 PM
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I might be a bit biased

My 2nd car was a Volvo 122s with dual su carbs. Loved that car but gave up on it due to all of the issues with the carbs

You would think I would have let go of the hate over the last 25 + years
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Old December 9th, 2012, 07:54 PM
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People need to learn to embrace the SU..it really is a wonderfully simple design.
And what a great car, the Volvo 122.
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  #9  
Old December 11th, 2012, 01:11 PM
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I've always swapped to 1 3/4" SUs those Strombergs or Zeniths are best used as wheel chocks.
The SU is a wonderfully simple carb to tune. Milage went up as did power when I swapped them. Mind you the Strombergs were well past their best.
I have a Haynes book of lies with all the needle specs and engines the carbs were fitted to.
A little ingenuity was needed to hook up the choke mechanism.
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Old July 3rd, 2013, 05:17 PM
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Ok I frigging give up. Float valves working fine, needles not bent, new diaphragms. I have had both carbs off and on the bench multiple times and have grown to hate them. Going merican this weekend with edlebrock 4bbl and manifold. The money Trey's truck has eaten would have bought something nice....
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Old July 3rd, 2013, 05:43 PM
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Unbolt them and throw them in the trash
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Old July 3rd, 2013, 05:48 PM
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Quote:
Originally Posted by dave_lucas View Post

Yep, know you to be a patient and rational man. Should have taken your sage advice....
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Old July 3rd, 2013, 06:00 PM
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Nah everyone must embrace the hate in their own time / way.
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Old July 4th, 2013, 12:20 AM
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Old July 8th, 2013, 08:41 PM
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Quote:
Originally Posted by evilfij View Post
14cux
you are a broken record with this 14cux stuff.

Ok got the edlebrock 4bbl manifold and carb on and aside from some plumbing and cable issues its up and running. Wow ! This combo really wakes up the 3.5.
That said lets see some pictures of how others have installed 4bbl manifolds in rhd trucks. I'm looking for ideas on how to plumb the valve cover breathers and cooling hoses. The stock radiator hose doesn't even reach the new coolant elbow. so what have others done ?
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Old July 8th, 2013, 09:08 PM
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Grew up with SU's never had an issue as a result. But I've been 14cux since 1995 so all that knowledge is trashed now.
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Old July 8th, 2013, 10:37 PM
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Quote:
Originally Posted by Uncle Douglas View Post
What are the carbs on an 83 3.5 ? Zenith/SU or Strombergs ? What model ?
Haynes manual may be of help.
ISBN 1 85010 019 5
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  #18  
Old July 9th, 2013, 07:55 AM
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Originally Posted by Antichrist View Post
Haynes manual may be of help.
ISBN 1 85010 019 5
Tom,
The original post question was from last December. We are a bit past that point. After months of dicking with the Zeniths I bought a edlebrock manifold and 4bbl carb. Last nights post was that I have that installed and up and running. Far better setup. Not sure why Rover in its infinite wisdom decided to ditch gm's original intake setup but not change anything else except displacement for 50 years.
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  #19  
Old July 9th, 2013, 08:02 AM
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The 3.5 was originally designed for the 4bbl/2bbl. Anything else that came along later was an adaptation. I plumbed my valve cover breathers back to a tee and then into the aircleaner. Not a picture of a rhd truck but maybe this will help some.
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  #20  
Old July 9th, 2013, 08:07 AM
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Originally Posted by LRover View Post
The 3.5 was originally designed for the 4bbl/2bbl. Anything else that came along later was an adaptation. I plumbed my valve cover breathers back to a tee and then into the aircleaner. Not a picture of a rhd truck but maybe this will help some.
Mike what did you do for a throttle cable ? I'm looking @ a myriad of hot rod stuff. I have a bracket that came with the manifold but the original cable is about 18 inches too short.
Pretty sure your 4.6 is different but the 3.5's water pump has 2 stub hoses that come out the back and adapting one of those to enter the front of the manifold looks like its not going to be fun.
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