willowwisp2 Posted April 24, 2015 Share Posted April 24, 2015 Apologies for all the questions but clearly, I'm new to the Herald.I'm pretty sure this is not an original carb so, if it's not, what's it from and what's the white plastic doofer on the side?http://i87.photobucket.com/albums/k138/pipeboy1/IMAG1226_zps004i3lqn.jpghttp://i87.photobucket.com/albums/k138/pipeboy1/IMAG1231_zpspdfiktg8.jpgThe car still runs from a choke cable so don't think it's any auto choke device.I thought the car was running a little rich but can't see how to adjust the mixture on this as there's what looks like (and I can only see it by photographing it) a castelled type nut on the bottom (last pic). Don't really want to take the carb off to get a better look.I've got three other carbs that came with the car and they all appear original, (i.e with the jet adjusting nut on the bottom and no white plastic doofer), so are they much of a faff to strip, clean and set up because if not, I might stick one of those on.Car seems to tick over fine and the plugs are nice and sandy coloured but others commented on it running rich and it did seem a little towards that end.Cheers. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted April 24, 2015 Share Posted April 24, 2015 That looks like a late Stromberg 150CD. It's not the right one for a Herald 13/60 but it's quite similar. The big differences are:- the white plastic capped long doofer on the side. This is a thermostatic correction valve, similar to the waxstat on late SUs.- the nasty late Stromberg tuning method requiring a special tool inserted down the dashpot damper hole (and likely to rip your diaphragms if misused)- possibly (though I can't quite see from your photos) a weird circular enrichment valve for the chokeThese carbs were fitted to a lot of cars in the early '70s, including Mk3 GT6s (where there is a pair, only one of which has the choke unit, the other relying on a balance pipe). Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 24, 2015 Share Posted April 24, 2015 these are CDSE or there abouts the white thingy is a temperature compensator that is supposed to open a air bleed to bypass the throttle plate and increase the idle a little and weaken the mixture when in hot conditions they are now aged and often open when should be closed take out the two screws and have a lookthe part which goes inside the carb body has two o ring seals one at the head of the round and one to seal this with the bore bottom both become degraded and will let air in .remove the plastic cover reveals the bi metal strip and a small plunger , never mind what the manuals say this little sod needs to be closed for normal running or you never get the idle mix rightsimple turn the small nut till the plunger is sprung 'closed' and give it one more turn. if it never opens its not really a problemyou just dont want it open when it should be closed is the most important clue.the carbs will also have a small hole in the manifold gasket to pass this air bleed into the manifold, adjustment is by a long allen key down the dashpot tube, there is no adjustment from the undersidesome of these have an offset slot which needs special tool or care with a screwdriver (not normally on triumphs)when adjusting the needle either take the piston out and hold it or get the special tool which has a knurled knob to stop you rotating and tearing the diaphragm.hope that helps a bitPete Quote Link to comment Share on other sites More sharing options...
willowwisp2 Posted April 24, 2015 Author Share Posted April 24, 2015 Thanks for that Rob.So, do you think the thermo CV is doing anything on mine?Don't fancy the potential tuning disaster!Could be EV for choke.Is it worth sticking one of the originals on? As stated, it seems to run OK so I might leave well alone unless some problem manifests.Ta. Quote Link to comment Share on other sites More sharing options...
willowwisp2 Posted April 24, 2015 Author Share Posted April 24, 2015 Many thanks Pete.Thinking it might be easier just to stick one of my original spares on if they're not to difficult to recon.I'll have a look at your suggestion re adjusting the doofer!Ta. Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 25, 2015 Share Posted April 25, 2015 on some you can fit the bottom jet assy into the newer body and get bottom adjustable , + the biased needle have youres even got the right needle in ?? should be a 6EPete Quote Link to comment Share on other sites More sharing options...
willowwisp2 Posted April 25, 2015 Author Share Posted April 25, 2015 Don't know if they have the right needle Pete. I'll look if I decide to go down the route of replacing the current carb.Don't think it's worth fitting the bottom jet into newer body. Might as well just change the complete carb me thinks.Many thanks.John. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted April 27, 2015 Share Posted April 27, 2015 Hi John,I think Pete answered the thermo CV questions pretty fully :)I would say, having a Mk3 GT6 (late type Strombergs) and a Mk1 Vitesse (early type) in my garage, I'd leave it alone if it works but consider putting it back to original if you have one spare. I've rebuilt both types and, while there's very little difference in their performance when working, the earlier ones do seem a lot less hassle.Cheers,Rob Quote Link to comment Share on other sites More sharing options...
willowwisp2 Posted April 27, 2015 Author Share Posted April 27, 2015 Cheers for that Rob.Yes, I'll leave alone unless a problem develops.I'm assuming mines a later type Strom?Ta. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted April 27, 2015 Share Posted April 27, 2015 Yes, the one in your photos is a late and/or emission controlled type. The original 13/60 fitting was an early type. Quote Link to comment Share on other sites More sharing options...
willowwisp2 Posted April 28, 2015 Author Share Posted April 28, 2015 Cheers Rob. Quote Link to comment Share on other sites More sharing options...
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