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MG MGB Technical - stage 1 carbs?

hi one and all,

just been perousing the mg owners club parts catalogue and notice they sell SU carbs "to stage 1 spec", only trouble is it doesn't say what this means.

anyone any clues?

Tony Sutton

The BL special tuning booklet describes Stage 1 road tune as follows -

"An increase of some 4bhp may be acheived by the fitting of twin 45mm (1.75in) diameter SU carburettors to the standard engine.

The larger carburettors can be obtained under Part No C-AUD 505 and all the necessary parts and instructions for fitting these are included in the installation kit number STN 0041.

Ignition timing: 8 degrees BTDC

Carburation: KP needles, blue spring, .100 in jets."
Chris at Octarine Services

Wow, 4 bhp. You'll really notice that...NOT. Many tuners reckon adding bigger carbs without making the cylinder head breathe more freely is a waste of money. If you are interested in this (expensive) subject, get a copy of Peter Burgess book "How to Power Tune MGB Engines". I think the club sell it. It gives a good idea of where the B engine is weak, and what it will take to make worthwhile gains. In my experience, buying strap-on tuning bits is almost always disappointing. The big gains are to be made deeper in the engine.
Mike
Mike Howlett

I believe these are SU HS6's, there's a copy of the BMC Special Tuning manual on the internet somewhere - I don't have the link to hand, but it's in the archives. I've got it here if you want it emailed - 2.3mb.

Tim.
Tim Jenner

Found the link to the Special Tuning manual - http://www.1978mgmidget.com/manuals_and_booklets.html

Tells you all about the different stages of tune. By stage 7 they were getting 130 bhp - but as Mike says, most of the changes were for 1 or 2 horses here and there.
Tim Jenner

This thread was discussed on 18/02/2004

MG MGB Technical index

This thread is from the archive. The Live MG MGB Technical BBS is active now.