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    #16
    It's still a two choke carb the 44, so to me is the 38 therefore undersized and should the 44 be the default choice?
    Why would you have the 38 if the 44 is better sized for the engine?
    Mike.
    74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

    Comment


      #17
      That makes sense Mike,

      How's you Holley running now..?

      Cheers
      Mike

      Comment


        #18
        Originally posted by mjheathcote View Post
        It's still a two choke carb the 44, so to me is the 38 therefore undersized and should the 44 be the default choice?
        Why would you have the 38 if the 44 is better sized for the engine?
        Interesting. My other classic has a 2 Litre 4 cylinder engine and it's fed by two 44 twin choke Webers. How does a 3 litre V8 really get by on just one twin choke with 38 or 44mm?

        ENGINE BAY BUILD 30.JPG
        The answer isn't 42, it's 1/137

        Comment


          #19
          Better airflow / higher revs requires & allows more carburation....pinto most likley has better airflow per litre than a stag & higher rpm too.
          There are 2 secrets to staying on top :- 1. Don't give everything away.
          2.

          Comment


            #20
            Originally posted by dasadrew View Post

            Interesting. My other classic has a 2 Litre 4 cylinder engine and it's fed by two 44 twin choke Webers. How does a 3 litre V8 really get by on just one twin choke with 38 or 44mm?

            ENGINE BAY BUILD 30.JPG
            It's difficult to know as there are no numbers to analyse, merely hearsay and opinion eg "it feels more responsive". If I had spent over 500 on a new carburettor I would also want to feel it had added something to the driving experience - call it psychology.
            Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

            Comment


              #21
              Something as trivial as a lighter throttle return spring can give the impression of " more responsive"
              Carbs suck.

              Comment


                #22
                You can get a lot of Strom rebuild kits for this money???????
                "The UK,s Most Easterly Stag" Quad Exhaust- ZF 4 Speed BOX

                Comment


                  #23
                  Originally posted by mike@thenook View Post
                  That makes sense Mike,

                  How's you Holley running now..?

                  Cheers
                  Holley itself is fine until fuel vapourisation.
                  When I fitted 25 years ago I used an aluminium wedge plate to level the carb, and this has regular gaskets either side.
                  So I think the problem is heat soak at low speeds, and the change of fuel to ethanol content has simply tipped the balance to causing a problem with the lower boiling point.
                  I haven't got the under bonnet clearance to simply add a thermal insulating gasket instead of a regular thin cork gasket, and haven't found a plastic wedge plate.
                  Like most this year it has been a wipe out with nearly all my vehicles, but I need to do something over this winter.
                  I'm trying to sort out the Maserati that has suddenly a misfire issue, hopefully just the spark plugs with the diagnostics I've carried out, was concerned it might have been the coil packs, a 3k bill for new ones!! But again might be fuel, even with fuel stabiliser, due to lack of usage.
                  Mike.
                  74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

                  Comment


                    #24
                    Originally posted by Stagdad View Post
                    Something as trivial as a lighter throttle return spring can give the impression of " more responsive"
                    Exactly Steve
                    Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

                    Comment


                      #25
                      Originally posted by Goldstar View Post

                      Exactly Steve
                      Sounds like an opportunity to fit a light spring to the Stromberg set up?

                      Comment


                        #26
                        Mike,

                        Heat soak was I think partially the problem with my Holley too, I did find a spacer which was made of layers of ally and normal gasket material but it added around 3/4" on top of the 70 degree adaptor and this was just too much to get the bonnet closed with the K&N pancake filter I had which was around 5cm deep - I reckoned if I used a thinner filter I'd get so much less air I'd need to faff with yet more jets.

                        Funny really as when I had it originally fitted by Tony Hart it was a straight out of the box jetted really for the Rover V8 (51 main and 53 secondary) and with a standard base plate and a very small v shaped filter - it worked great then so I should have left it alone I guess!

                        3k for the Maser bits -cripes!
                        Mike

                        Comment


                          #27
                          Originally posted by Hughesy View Post

                          Sounds like an opportunity to fit a light spring to the Stromberg set up?
                          better still, a fixed linkage as far as possible
                          The answer isn't 42, it's 1/137

                          Comment


                            #28
                            Originally posted by mike@thenook View Post
                            Mike,

                            Heat soak was I think partially the problem with my Holley too, I did find a spacer which was made of layers of ally and normal gasket material but it added around 3/4" on top of the 70 degree adaptor and this was just too much to get the bonnet closed with the K&N pancake filter I had which was around 5cm deep - I reckoned if I used a thinner filter I'd get so much less air I'd need to faff with yet more jets.

                            Funny really as when I had it originally fitted by Tony Hart it was a straight out of the box jetted really for the Rover V8 (51 main and 53 secondary) and with a standard base plate and a very small v shaped filter - it worked great then so I should have left it alone I guess!

                            3k for the Maser bits -cripes!
                            Yes mine was a Hart kit.
                            I modified the adapter and inlet manifold to open it up larger, and returned the v shape filter having bought a drop base plate K&N.
                            I found the standard jetting far too rich, and had immediate problems with the electric choke.
                            I therefore bought a manual choke kit (never cabled up, just a few pumps of the throttle does the trick), secondary jet plate replacement for screw in jets, and the wedge plate for my engine was at far too a slope.
                            With the wedge plate it also provided much better clearance for the kick down cable over the top of the distributor.
                            I ended up fitting new 49's in the main, and then moving the 51's to the secondary jet plate.
                            Should get the EFI fitted but I keep on getting distracted with new toys!!
                            Parts and mods for the Maserati are on another level, but as usual, enthusiastic owners do find part cross reference for certain parts at a much cheaper price, in a non Maserati box, or ironically a Ferrari box which can sometimes be cheaper!
                            Last edited by mjheathcote; 17 October 2020, 16:52.
                            Mike.
                            74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

                            Comment


                              #29
                              Interesting Mike,
                              i seem to remember I too fitted 49 front and 51 secondary (ii’ll have to check that) plus I had the drop base K&N a good piece of kit. Mine was a manual choke from the start but as you say, couple of pumps on the pedal and never needed the choke.
                              I started messing about with different springs in the secondary pump which I think messed things up a bit plus I fiddled with the secondary flaps idle screw ( the one underneath the carb) which was also a bad move...
                              Think I’ll have to have another play soon, winter and lock downs or whatever they are called now prevent a fair bit of normal life so good to have more ply a time!

                              Love the Mas’ just a bit beyond me at the moment trying to avoid pinching some pension!

                              Cheers
                              Mike

                              Comment


                                #30
                                Originally posted by mike@thenook View Post
                                Interesting Mike,
                                i seem to remember I too fitted 49 front and 51 secondary (ii’ll have to check that) plus I had the drop base K&N a good piece of kit. Mine was a manual choke from the start but as you say, couple of pumps on the pedal and never needed the choke.
                                I started messing about with different springs in the secondary pump which I think messed things up a bit plus I fiddled with the secondary flaps idle screw ( the one underneath the carb) which was also a bad move...
                                Think I’ll have to have another play soon, winter and lock downs or whatever they are called now prevent a fair bit of normal life so good to have more ply a time!

                                Love the Mas’ just a bit beyond me at the moment trying to avoid pinching some pension!

                                Cheers
                                The 4200/Gransport are a wonderful thing. Basically Ferrari in a nice suit. Engine subsequently fitted to the 430 (with different crank and induction), and transmission and suspension 550. They are an absolute steel at the moment too.
                                Crazy that my mint 18k mile 4200 is probably worth no more than my Stag...
                                Mike.
                                74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

                                Comment

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