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MG MGB Technical - K & N which needle ?

Can anyone tell me which needles are recommend as a starting point for a 1976 mgb roadster with HIF carbs on a standard engine when K & N's have been fitted?

thanks oscar
oscar

The standard needles are normally AAU, it's necessary to put ABD and may be AAA.
Regards
mw michel

Oscar

My local specialist reccommended AAA for the 'deep' K+N filters.

HTH

Jason
Jay Smith

I went from ABD to AAA needles when I converted to the K&N "Bob" filters on HIF carbs.

Barry
B.J. Quartermaine

hi i had my dyno tested with AAA needles they were to rich and i had to clean the spark plugs as they got sutted up with in a few days.
daren

If you found that a AAA needle was too rich, you might look at the P4 with one of Joe Curto's swing-needle-to-fixed-needle adapters. The P4 runs slightly richer than the original stock #5, but not nearly so much as the AAA. If the P4 doesn't do it for you, then try a #6 or CN, also both fixed needles. The #6 was the original rich needle, and a CN is somewhat richer still, but still not nearly as Rich as the AAA. The AAA is really quite a bit richer than the original #6 rich needle.

For a direct view comparison, you can go to this site, http://www.mintylamb.co.uk/suneedle/ , and enter in these needles to see their profiles graphically compared, or to research any others you might want to try. You only need an incremental change when running with K&Ns, not a big one.

To get these "oddball" needles, I am afraid you'll probably have to get them straight from Burlen, the SU manufacturer, http://www.burlen.co.uk/ (go down to "needles, .90" fixed). 7.19 pounds ea.
Bob Muenchausen

Sorry, that last line should read, "(go down to .09" jet)
Bob Muenchausen

This thread was discussed between 09/04/2007 and 10/04/2007

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