Carb Needle Options
Hi all, I am hoping that someone has been down this road before me. My new purchase has its original 2 litre engine, but a previous owner has fitted twin HS6 SUs from a 2500 S, with the matching separate air filter unit, elephant trunk and air collector box.
The car runs well, but runs rich throughout the rev range, I’m guessing and will check, but I expect that the original 2500 S needles are still fitted.
Does anyone have any experience of switching needles and how it has worked? I don’t want to fit too lean needles for fear of damaging the engine.
All contributions gratefully received.
The car runs well, but runs rich throughout the rev range, I’m guessing and will check, but I expect that the original 2500 S needles are still fitted.
Does anyone have any experience of switching needles and how it has worked? I don’t want to fit too lean needles for fear of damaging the engine.
All contributions gratefully received.
Chris
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
Re: Carb Needle Options
Try speaking to Burlen who deal with all the SU carbs stuff.
They will recommend a needle and jet.
http://sucarb.co.uk/technical/
They will recommend a needle and jet.
http://sucarb.co.uk/technical/
Re: Carb Needle Options
I think Chris Witor may have some knowledge on the best needles for your carbs / engine. Worth a phone call at least.
Register Member no. 1596
1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red
1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red
Re: Carb Needle Options
Hello Carboy0,
why not try weakening the mixture a bit first? If it's rich thoughout the range it doesn't sound as though the needles are far off?
Alec
why not try weakening the mixture a bit first? If it's rich thoughout the range it doesn't sound as though the needles are far off?
Alec
0465
MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.
MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.
Re: Carb Needle Options
Well, a torch (literally) has shed some light on what’s going on with the carbs.
The front one is tagged FZX 1263F and the rear one AUD 678R!
According to Burlen Fuels website neither tag number have ever been used, although they are within a couple of digits of some genuine 2000 Mk2 TC carbs!
I checked the numbers three times to be sure, so I now have an enquiry out with Burlen Fuels, I’ll keep you all posted.
The front one is tagged FZX 1263F and the rear one AUD 678R!
According to Burlen Fuels website neither tag number have ever been used, although they are within a couple of digits of some genuine 2000 Mk2 TC carbs!
I checked the numbers three times to be sure, so I now have an enquiry out with Burlen Fuels, I’ll keep you all posted.
Chris
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
Re: Carb Needle Options
I would have thought that an HS6 is an HS6 irrespective of the numbers. Take the needles out and check the numbers on them. If you have eyes like mine you may need a magnifying glass. If they are the same have a look at 'Minty Lamb ' on the web . When I had fuelling problems on my S a couple of years ago,I finally replaced the jets which were worn and hard to see by eye. Fixed my problems.
Tony.
Tony.
1976 2500 TC. converted to S specs.
Lots of bits
1999 BMW Z3.
2006 BMW 325ti.
Hopefully not needing too many bits.
.
Lots of bits
1999 BMW Z3.
2006 BMW 325ti.
Hopefully not needing too many bits.
.
Re: Carb Needle Options
Thanks guys
Burlen has confirmed that the carbs are for the Triumph 2500 TC, one has a standard jet and the other a waxstat jet.
Well at least I know what I have got. The plan is to rebuild them to 2000 TC spec with standard jets and standard 2000 TC needles.
Burlen has confirmed that the carbs are for the Triumph 2500 TC, one has a standard jet and the other a waxstat jet.
Well at least I know what I have got. The plan is to rebuild them to 2000 TC spec with standard jets and standard 2000 TC needles.
Chris
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
-
- Site Admin
- Posts:3593
- Joined:Mon May 08, 2006 9:50 pm
- Location:South Oxfordshire, UK
Re: Carb Needle Options
Later 2000s used the HS6 carbs on the long manifold, so the needles (and maybe springs too) specified for one of those would be a good start.
I have the Burlen books here so I can check the needles for a 2000 if you wish.
I would strongly suggest you ditch the waxstat jet! There are (were?) conversion kits available for that.
Cheers,
Mike.
I have the Burlen books here so I can check the needles for a 2000 if you wish.
I would strongly suggest you ditch the waxstat jet! There are (were?) conversion kits available for that.
Cheers,
Mike.
(South Oxfordshire)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
(1949 LandRover was blue should be light green!)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
(1949 LandRover was blue should be light green!)
Re: Carb Needle Options
Hi Mike,
I am in touch with Burlen Fuels and with their have identified a good spec for a 2.0 litre engine on HS6s. The rear carb with waxstat will be rebuilt with the simpler jet, using the Burlen conversion kit.
I am in touch with Burlen Fuels and with their have identified a good spec for a 2.0 litre engine on HS6s. The rear carb with waxstat will be rebuilt with the simpler jet, using the Burlen conversion kit.
Chris
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
Member 7910
Saffron 2000 TC Man O/D - actually 2500 TC Man O/D - bit of a project.
Magenta Stag 3.0 Man O/D
-
- Site Admin
- Posts:3593
- Joined:Mon May 08, 2006 9:50 pm
- Location:South Oxfordshire, UK
Re: Carb Needle Options
Great, good luck with that! I put a pair of HS6s on an early 2000 many years ago, but despite me searching all the paperwork, I never did find which needles I used!
Cheers,
Mike.
Cheers,
Mike.
(South Oxfordshire)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
(1949 LandRover was blue should be light green!)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
(1949 LandRover was blue should be light green!)
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