Phil Jones Posted June 28, 2022 Report Share Posted June 28, 2022 Hi on taking my SU carbs off to service them I found the vacuum advance and retard pipe just "hanging loose" behind the front carb, but can't find any vacuum take off connecter on either carb or manifold where should it take its feed from ?? Thanks for any help Phil Quote Link to post Share on other sites
RobH Posted June 28, 2022 Report Share Posted June 28, 2022 (edited) Assuming you have H6 carbs, there should be a threaded boss just in front of the mounting flange on the bottom of the front carb. If that isn't threaded, perhaps the rear one is. If the car has more modern replacement HS6 carbs, the take-off is usually a push on connector on the top of the carb between the cover and the mounting flange. It could be on either carb. Edited June 28, 2022 by RobH Quote Link to post Share on other sites
james christie Posted June 28, 2022 Report Share Posted June 28, 2022 (edited) To raise your ´comfort level'. I've been running my 3A with a 4A cylinder head and HS6 carburettors for some 20 years without a vacuum advance. When it gave up on me and I just sealed up both ends - no Distributor Doctor in those days - and I don't miss it, although the centrifugal weights in the distributor have been set up accordingly. james Edited June 28, 2022 by james christie Quote Link to post Share on other sites
Phil Jones Posted June 29, 2022 Author Report Share Posted June 29, 2022 Thanks Rob for the very clear description and photos. I have H6 carbs and found the under carb threaded outlet but no adaptor it ! looks like the flexible (windscreen washer tube?) on the end of the metal pipe has just been pushed in to the threaded hole in the past, I will hopefully be able to source the proper adaptor, I have already found "Southern Carburettor's" very helpful. Thanks also to James for his reply I expect I'll be back here for more advice as time goes on. Brilliant forum, thanks again. Phil Quote Link to post Share on other sites
RobH Posted June 29, 2022 Report Share Posted June 29, 2022 (edited) There isn't really an adaptor Phil. The correct copper pipe has the fitting and olive on it - its usually part number 33 here, but that will depend on how it connects to your distributor: https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/electrical-system/ignition-system/ignition-system-tr2-4a-1953-67.html It looks as though you can buy the fitting and olive though to fit your existing pipe if it is the right size - parts 32 and 30. Edited June 29, 2022 by RobH Quote Link to post Share on other sites
Ian Vincent Posted June 29, 2022 Report Share Posted June 29, 2022 Phil, The Distributor Doctor can supply you with the correct small bore copper pipe to connect the carbs to the advance / retard module. Chances are he can supply the necessary adaptors. Rgds Ian Quote Link to post Share on other sites
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