Volvo RWD 140-160 Forum

INDEX FOR 2/2026(CURRENT) INDEX FOR 3/2004 140-160 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

uid 14369's pic
posted by  KLR142 on  Wed Apr 6 09:58 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon May 9 12:44 CST 2011
[RELATED]

And you're probably sick of them. But for everyone who has an SU alloy manifold, I'd love it if you went out to yours and checked out the part numbers on them. I got another one in the back of my wagon when I got it, and I'm trying to figure out the differences that John Parker mention. John, do you happen to have any part numbers that I can look at?

Anyway, the two manifolds that I have appear to be the same from the exterior. Their main part numbers are both 418404, but on the other side of the manifold, my current installed one says JM 2, and the one from the back of my wagon says JM 3.

Anyone have any clue what the numbers are/mean? Were all the alloy volvo SU manifolds the same part number but with differing JM whatever numbers for different versions?

Pictures are HERE with the caption below stating which manifold the pictures are of.

In any case... The JM 3 one has longer studs for the carbs which would allow me to run my phenolic spacers... But the question is, should I? I need to find some gaskets...
--
Kyle - '68 142? - Oregon Volvo Tuners?








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

    posted by  walrus3 on  Wed Apr 6 15:56 CST 2005
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    My guess is that the JM numbers refer to some admin detail, like YOM, Lot#,
    or maybe even position in a multicavity mold. Measure the bores and if they
    are the same the manifolds are the same. Unless modified, I'll bet they are
    all the same (at least the ones with the same p/n).
    --
    George Downs Bartlesville, Heart of the USA!








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

    posted by  Phil S. on  Wed Apr 6 10:34 CST 2005
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 13:18 CST 2014
    [RELATED]

    I've got two here today. One says VOLVO418404 and has no other markings. It does not have a port for a vacuum fitting in the center, and it has short studs. The other says 418404 JM2 and it does have the fitting, also with short studs. No other apparent differences.

    I've never run phenolic spacers and I've never had a fuel vapor problem as long as the correct heat shield was installed. I don't suppose they can hurt anything.

    Rhys has lotsa gaskets.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

      uid 779's pic
      posted by  matt b on  Thu Apr 7 03:26 CST 2005
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Tue Oct 14 16:33 CST 2014
      [RELATED]

      The only differences I've ever noticed are vaccuum outlets. The studs to which the carbs bolt are replaceable. Any good hardware store should have longer ones that would allow for the spacers. I always have used the spacers, and still have had fuel vapor troubles. I've even doubled the spacers up and used two heat shields and had problems...

      Gaskets should be easy to find. Or make 'em out of a cereal box and rtv blue.

      -Matt
      --
      -Matt I ♥ my ♂








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

        posted by  Phil S. on  Thu Apr 7 03:58 CST 2005
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 13:18 CST 2014
        [RELATED]

        I shoulda said I never had problems with SUs that were not worn out. Leaky throttle shafts mean you gotta tune them rich at idle, and I have had hard hot starts in that condition. I don't think installing spacers is the smart fix, tho...








        •   REPLY TO THIS MESSAGE    PRINT   SAVE 

          another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

          uid 5832's pic
          posted by  AndrewC on  Thu Apr 7 07:07 CST 2005
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Sat Mar 31 07:28 CST 2007
          [RELATED]

          Phil S.=Leaky throttle shafts mean you gotta tune them rich at idle, and I have had hard hot starts in that condition.

          When I put on my DGV, that's the exact condition my SU's were in. Would not restart hot unless you waited at least a 1/2 hour. Unless you had a can of starter fluid....








          •   REPLY TO THIS MESSAGE    PRINT   SAVE 

            another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

            uid 14369's pic
            posted by  KLR142 on  Thu Apr 7 10:15 CST 2005
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Mon May 9 12:44 CST 2011
            [RELATED]

            Andrew, do you have a alloy SU manifold? What are the numbers on it?
            --
            Kyle - '68 142? - Oregon Volvo Tuners?








            •   REPLY TO THIS MESSAGE    PRINT   SAVE 

              another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

              posted by  someone claiming to be TimC on  Thu Apr 7 19:02 CST 2005 [RELATED]

              The one I have here in Australia is part # 418404 and JM3. As far as I know it came off a 122S year unknown although on the 1966 model I had had a similar manifold.
              TimC








              •   REPLY TO THIS MESSAGE    PRINT   SAVE 

                another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

                posted by  jparker3 on  Sat Apr 9 11:11 CST 2005
                Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                last visit: Tue Jun 9 18:47 CST 2009
                [RELATED]

                The one that flows best is identical to that one, on the outside,
                and has no part #. The difference is the shape right after the face where the
                carb bolts on.

                John
                V-Performance.com








                •   REPLY TO THIS MESSAGE    PRINT   SAVE 

                  another SU alloy intake manifold thread! part numbers and flow differences? (pics) 140-160

                  uid 14369's pic
                  posted by  KLR142 on  Sun Apr 10 22:31 CST 2005
                  Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                  last visit: Mon May 9 12:44 CST 2011
                  [RELATED]

                  Interesting that it has no part number... How many of these have you come accross? The shape right after the face where you mount the carb you say? Well, can one of these manifolds be modified a bit to match one of these other ones you speak of?

                  FWIW, I was reading the Intake Manifold Theory found at www.grapeaperacing.com, and from looking at my manifolds, I came up with some thoughts...


                  This edge right inside the opening does not match the flow of the middle of the manifold right after that opening. I'm thinking of porting(or rather, blending/radiusing) the manifold here in this area to get rid of the sharp ridge, and just have a smooth opening that is all blended into one shape that flows along with the manifolds inner walls. This current shape that shoots the carb's air/fuel mix over a sharp edge and then allows it to follow the walls of the manifold doesn't seem optimal to me. I also want to clean it up a bit on the other side of the manifold where it leads into the head because it's sort of the same situation, although much less extreme and reversed. Blending in the runners in these two areas for smooth flow(I don't mean polishing anything) would be a good thing, no?

                  Or is that bit that doesn't match the rest of the manifold there for a reason?

                  John(and everyone else), why do people usually put on spacers in between the carbs and the manifold? It effectively increases the runner length, and increases the volume in between the carbs and the intake valves. Does the increased volume between the carbs and intake valves improve high RPM running? I think I was getting that impression from what I had time to read from that article... All of your thoughts?
                  --
                  Kyle - '68 142? - Oregon Volvo Tuners?







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.