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MG MGA - SU Needles

I am building up a early MGB 1800 engine for my A. Its a 66 5 bearing . Its pretty much standard . I intend using the MGA H4 carbs. Has anybody got a good starting point for carb needles as i assume the 1600 needles will be no good and no B was ever fitted with H4 carbs..

Thanks Roy
R Mcknight

Roy

I transferred absolutely everything that was external on my 1500 to an 1800V. I just retuned using all the existing kit. I did have a tuning issue with the carbs, but that was due to excessive fuel pressure from a non standard fuel pump and nothing whatsoever to do with the diffent engines. I retained the same jet needle.

Steve
Steve Gyles

Roy,
Just fitted a 67 B engine with 5-speed gearbox to my 56 roadster 2 weeks ago. Used the carbs off the 1500 engine without changing needles. Although I have only done about 60 miles so far, this seems a good starting point.
Won't know more until I have done about 200 miles, retorqued the head, and adjusted the valve clearances. Then I will check the mixture by looking at the spark plugs.
It has real get up and go at the moment, so the mixture can't be far off.
Peter.
P. Tilbury

1600/1622 MGA is essentially the same as early 1800, but uses H4 carbs, so that is the best starting point, works perfectly. #6 needles, which is the "standard" for 1600 or "rich" needle for MGB, #5 is "standard" for MGB. MGB with free flow filters usually wants #6.

FRM
FR Millmore

This thread was discussed on 06/11/2012

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