alan.gilbert_6384 Posted June 20, 2021 Report Share Posted June 20, 2021 Hi All. hope your all well. Been playing with the spitfire again, its been a really rough running until up to temperature, then it's really good. These are the plugs, any ideas anyone? Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 20, 2021 Report Share Posted June 20, 2021 well the electrode seems clear but thee base looks sooty had this been running on choke that can take 10mile of hot driving to clear it Pete Link to comment Share on other sites More sharing options...
alan.gilbert_6384 Posted June 20, 2021 Author Report Share Posted June 20, 2021 2 hours ago, Pete Lewis said: well the electrode seems clear but thee base looks sooty had this been running on choke that can take 10mile of hot driving to clear it Pete Hi Pete, oh, maybe I need a longer run after its warmed up, this was only about 5 miles. I have done the carb lift pin check 1 to 2 mm (approx) and no change in RPM, then all the way up and it stalls (i believe this is correct). Checked with the colour tune, and balance air meter all looks good. Will try again, if it stops raining before Christmas Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 20, 2021 Report Share Posted June 20, 2021 no point in a full lift it will just stall all sounds to be pretty much OK was the pin lift with air cleaners on as taking them off gives very false results i see no logic in the books that suggest a lift with a screwdriver and cleaners removed as the intake vacuum is vastly different between being on or off chalk and cheese results it must always be in a as on road running condition sorry in cold dismal mood ha ! Link to comment Share on other sites More sharing options...
alan.gilbert_6384 Posted June 20, 2021 Author Report Share Posted June 20, 2021 Hi Pete, yep with the filters on, k and n, not the original box, that’s in a box in the garage. Changed by the PO Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 20, 2021 Report Share Posted June 20, 2021 good were the needles changed from std to get the mixture right with KNs as they would normally weaken from std as there is less depression to pull fuel from the jet so with a std needle you probably have to set it richer to actually run reasonable ? just some ramblings Pete Link to comment Share on other sites More sharing options...
alan.gilbert_6384 Posted June 21, 2021 Author Report Share Posted June 21, 2021 Hi Pete, no idea about the needles, the filter was changed by the PO. Is there any way of telling ? Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 21, 2021 Report Share Posted June 21, 2021 Alan just which spitfire is this ??? Pete Link to comment Share on other sites More sharing options...
alan.gilbert_6384 Posted June 21, 2021 Author Report Share Posted June 21, 2021 Hi Pete, it’s a 1500 1976. SU 4 carbs Link to comment Share on other sites More sharing options...
Anglefire Posted June 22, 2021 Report Share Posted June 22, 2021 Alan, there is a windows program called WinSu which allows you to enter the cars details and any modifications and it will then select some suitable needles and springs - obviously keeping everything standard will give you factory - which are either ADT or ABT depending on late or early 1500. I think early is the Mk4 and late the 1500. If you take the needles out of the carb - the reference is stamped into the end of the needle. On the attached the red line is "standard" for my car and the other 4 lines the next suggested needles for the spec of my car - not a lot of difference! Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 22, 2021 Report Share Posted June 22, 2021 early are ABT then late ADN std filters KN and tubular manifold AAR https://www.canleyclassics.com/?diagram=triumph-spitfire-mkiv/1500-carburettor-details-twin-carb-engine&ptno=AAR https://www.canleyclassics.com/?diagram=triumph-spitfire-mkiv/1500-carburettor-details-twin-carb-engine&ptno=ABT https://www.canleyclassics.com/?diagram=triumph-spitfire-mkiv/1500-carburettor-details-twin-carb-engine&ptno=ADN when undoing the needle grub screw the whole bias block and its small spring will come out just take care and replace in the same place so the screw locates in the slot and its flush with the base of the air piston pete Link to comment Share on other sites More sharing options...
alan.gilbert_6384 Posted June 22, 2021 Author Report Share Posted June 22, 2021 Brilliant both, I will investigate and let you know what i find, cheers thanks a lot. Link to comment Share on other sites More sharing options...
alan.gilbert_6384 Posted June 22, 2021 Author Report Share Posted June 22, 2021 Hi just to make sure, I take it this is a tubular exhaust ? it that this is what is referred to a tubular exhaust ? Link to comment Share on other sites More sharing options...
Anglefire Posted June 22, 2021 Report Share Posted June 22, 2021 10 hours ago, Pete Lewis said: early are ABT then late ADN std filters KN and tubular manifold AAR https://www.canleyclassics.com/?diagram=triumph-spitfire-mkiv/1500-carburettor-details-twin-carb-engine&ptno=AAR https://www.canleyclassics.com/?diagram=triumph-spitfire-mkiv/1500-carburettor-details-twin-carb-engine&ptno=ABT https://www.canleyclassics.com/?diagram=triumph-spitfire-mkiv/1500-carburettor-details-twin-carb-engine&ptno=ADN when undoing the needle grub screw the whole bias block and its small spring will come out just take care and replace in the same place so the screw locates in the slot and its flush with the base of the air piston pete Interesting - I went on the MOSS site for the references which are different - so the graph revised with ABT, ADN AAR and ABS which is what was suggested for my Spit And yes, that is a tubular exhaust. Link to comment Share on other sites More sharing options...
Iain T Posted June 22, 2021 Report Share Posted June 22, 2021 Somewhere in technical on the Burlen website there is a spreadsheet they use to compare SU needles. If you can't find it Burlen will help. Iain Link to comment Share on other sites More sharing options...
Anglefire Posted June 22, 2021 Report Share Posted June 22, 2021 31 minutes ago, Iain T said: Somewhere in technical on the Burlen website there is a spreadsheet they use to compare SU needles. If you can't find it Burlen will help. Iain Its actually a link ti Mintylamb that has found a new home. www.mintylamb.co.uk/suneedle/ Link to comment Share on other sites More sharing options...
Iain T Posted June 22, 2021 Report Share Posted June 22, 2021 1 hour ago, Anglefire said: Its actually a link ti Mintylamb Is Stromberg site beefnmustard? These site do help the hopelessly obsessive tiddlers (me!) but there's no substitute for years of experience. Iain 1 Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 23, 2021 Report Share Posted June 23, 2021 11 hours ago, Iain T said: hopelessly obsessive tiddlers hope you mean TWIDDLERS you can get pills for tiddling Ha!! ive done both with i need a new float Pete Link to comment Share on other sites More sharing options...
Iain T Posted June 23, 2021 Report Share Posted June 23, 2021 1 hour ago, Pete Lewis said: hope you mean TWIDDLERS Bl**dy autofil, where are my Tena pants...? Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 23, 2021 Report Share Posted June 23, 2021 over the top of your 9's they come if a variety of capacity ha Link to comment Share on other sites More sharing options...
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