68vitesse Posted November 8, 2018 Report Share Posted November 8, 2018 Just replaced the diaphragms, both had holes, in the carbs on my 2L Mk1 Vitesse and decided to tune carbs from scratch. Took jet down by three turns after it started to move the piston up but have had to turn it down by between two and three more turns which seems a bit much. Is this a sign of worn carbs or about par for the course. Many thanks Paul Link to comment Share on other sites More sharing options...
NonMember Posted November 8, 2018 Report Share Posted November 8, 2018 I think it's supposed to be three turns from flush, which isn't necessarily the same as "after it started to move the piston". Also, are you counting whole turns or flats? If you really are needing lots of turns, you may have an air leak. Link to comment Share on other sites More sharing options...
yorkshire_spam Posted November 8, 2018 Report Share Posted November 8, 2018 Float height wrong? If the fuel level is cutting off too low the jets will end up needing to be lower? Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 8, 2018 Report Share Posted November 8, 2018 The 3 turns is just an accademic start point so any up or down from there to fine the settings to best running doesnt matter too much All variable due to needle placing , jet wear spindle wear and floats is why its all adjustable Pete Link to comment Share on other sites More sharing options...
68vitesse Posted November 17, 2018 Author Report Share Posted November 17, 2018 This is what I ended up with after a good fast run. Left no1 perhaps a little rich?. Right no.6 about right?. Unless you disagree. Regards Paul Link to comment Share on other sites More sharing options...
johny Posted November 17, 2018 Report Share Posted November 17, 2018 I use the little lifter pin on each carb to test my mixture and it seems to work quite well now Ive got the hang of it. Plugs do look a bit mismatched but Id have a look at all 6 to confirm it.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 17, 2018 Report Share Posted November 17, 2018 yes left is a tad rich rule for lifting pins is ...be gentle its a touchy feely thing lift pin to just feel it contact the air piston now lift it a few mm , dont yank it up you are looking to hear a small hint of change in the idle rpm up 50rpm its rich no change about right a 50rpm drop its weak doing this with the filter off is a waste of time, must be in your running state , as on refitting you change the airflow/vacuum dramatically Pete Link to comment Share on other sites More sharing options...
SpitFire6 Posted November 17, 2018 Report Share Posted November 17, 2018 Hi, Here is the Stromberg Guide: http://www.74tr6.com/pdfs/Stromberg Reference Manual.pdf Cheers, Iain. 1 Link to comment Share on other sites More sharing options...
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