Stratton Jimmer Posted September 9, 2023 Report Share Posted September 9, 2023 Have been running the Sixfire with this pair of Strombergs until it started playing up recently. Having removed and stripped them I suddenly became aware that they have different float chamber blanking plugs in that the front one has what appears to be an adjustable jet. This can't be right can it? The bodies of the carbs are the same albeit that the front one has the choke mechanism. Can anyone advise if I have a mongrel pair or is this as they should be? Link to comment Share on other sites More sharing options...
dougbgt6 Posted September 9, 2023 Report Share Posted September 9, 2023 (edited) Well, it's got a slot, but that ain't a bottom adjustable Stromberg. This is what they look like, bottomwise. Or is it? Take the reservoirs off, see what's inside? Doug Edited September 9, 2023 by dougbgt6 Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 9, 2023 Report Share Posted September 9, 2023 yes its just an alternative blanking plug for the redundant jet holder assy or the earlier CDS only the front one has the starting valve choke withaa fuel feed via tube to the rear one as you have . look quite workable to me providing the needles and springs are all the same its no worries Pete Link to comment Share on other sites More sharing options...
Stratton Jimmer Posted September 10, 2023 Author Report Share Posted September 10, 2023 Thanks Guys, they had been working well enough and now I have stripped them and checked diaphragms and float heights, checked that there were no dreaded rubber slivers and so on, I will refit them and see how I get on. 1 Link to comment Share on other sites More sharing options...
trigolf Posted September 17, 2023 Report Share Posted September 17, 2023 Recently several people have been querying the type of Strombergs fitted to their car, and whether they are correct for the car. I found my Haynes Stromberg manual recently which lists all the variants by carb model number/car model. The carb no is either on a small brass/ali tag secured through one of the dashpot cover screws and is also generally stamped into the fixing flange. 1 Link to comment Share on other sites More sharing options...
Stratton Jimmer Posted October 28, 2023 Author Report Share Posted October 28, 2023 Having refitted the carbs, the car ran well for a couple of weeks (circa 200 Miles) then the rear carb started playing up with the piston sticking in the up position... NOT GOOD! I have temporarily reverted to using the HS6 SUs and it is running well but having stripped the Strombergs yet again, I can't find what is causing the piston to stick. I'm open to suggestions. Link to comment Share on other sites More sharing options...
chrishawley Posted October 28, 2023 Report Share Posted October 28, 2023 30 minutes ago, Stratton Jimmer said: I can't find what is causing the piston to stick. I'm open to suggestions Possibly worth trying is this....: The cover (held by the four Phillips screws) is in principle a precise machine fit to the body of the carburettor. But I've found on at least some Strombergs just a gnats of variance in the fit such that exactly how one tightens the four screws is the difference between binding and no binding. Thus when refitting the cover my approach is to tighten the screws progressively a little at a time while continually feeling the movement of the air valve and, if need be, 'settling' the cover with bit of wiggling. And then, having found the sweet spot not to tighten the screws any more than is needed for attachement. 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted October 28, 2023 Report Share Posted October 28, 2023 i would give the piston slide a good clean with some very fine wet and dry if its not got a thick diaphragm that can jam the piston and at fully up wont be needle centralisation can only be a high spot on the slide Pete 1 Link to comment Share on other sites More sharing options...
trigolf Posted October 29, 2023 Report Share Posted October 29, 2023 13 hours ago, chrishawley said: Possibly worth trying is this....: The cover (held by the four Phillips screws) is in principle a precise machine fit to the body of the carburettor. But I've found on at least some Strombergs just a gnats of variance in the fit such that exactly how one tightens the four screws is the difference between binding and no binding. Thus when refitting the cover my approach is to tighten the screws progressively a little at a time while continually feeling the movement of the air valve and, if need be, 'settling' the cover with bit of wiggling. And then, having found the sweet spot not to tighten the screws any more than is needed for attachement. That is exactly the method I use, which works. I had also previously cleaned the piston, but it still jammed. It's a bit labourious tightening each screw a micron at a time, but heh ho. I often wondered if the top cover flange has been over-tightend in the past by PO and the flange is slightly distorted? 1 Link to comment Share on other sites More sharing options...
Stratton Jimmer Posted October 29, 2023 Author Report Share Posted October 29, 2023 Thanks chaps, I will do as you suggest and let you know the outcome. Link to comment Share on other sites More sharing options...
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