I'm gradually getting the bits together to start my engine build but can't find much info about the carbs.
I'm going to use my p6 carbs (and distributor, 3.9 cam, standard valves and mildly ported heads) which I understand will run lean if left unchanged - does anyone have a suggestion for needles & springs?
I'm not expecting to get it right first time but don't want to drive it too lean on the way to a rolling road to get it done properly.
Carb needles for 4.6 Rover
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Just checked my SU refernce catalogue. The P6 3.5 with HS6's ran AUD1536K or the richer CUD1102 needles and AUC1167 springs. It shows no option for richer settings. Later P6's ran HIF6's which means you could go for the SD1 needle and spring HIF6 option of CUD1109 needles and AUD4398 springs.
It might be worth giving Burlen Fuels a call in Salisbury
http://sucarb.co.uk/carbspec/carburetto ... s/id/2255/
As note:
AUD1167 springs are Yellow code, 8oz @ 2.750" length
It might be worth giving Burlen Fuels a call in Salisbury
http://sucarb.co.uk/carbspec/carburetto ... s/id/2255/
As note:
AUD1167 springs are Yellow code, 8oz @ 2.750" length
My 4.6 has been running with SU carburettors since 2007, covering over 100,000 Miles since that time.
Is your engine fairly standard or upgraded in many different ways, as the needles and springs will be dependent upon either?
If the former, I would start with BAC needles, and if these prove to be too lean, try BCA. For springs, go with yellow graded 8 oz.
My engine runs BBW needles, but these have been polished.
Ron.
Is your engine fairly standard or upgraded in many different ways, as the needles and springs will be dependent upon either?
If the former, I would start with BAC needles, and if these prove to be too lean, try BCA. For springs, go with yellow graded 8 oz.
My engine runs BBW needles, but these have been polished.
Ron.
4.6 Rover 3500 P6B