>I think the vacumn would stay constant because the piston is supposed
>to rise and fall to maintain a constant vacumn. So a blocked
>air filter would cause the piston to rise which also raises the
>needle which makes the mixture richer. Does anybody know in fact
>if the SU carburetor is senitive to the air flow resistance of the
>filter? If so it sounds like one should make sure the air filter is
>clean before adjusting the carb!
The SU tuning manual recommends that upon refitting air cleaners they
should first be checked that they are clean and unclogged. It further
advises to recheck the mixture strength as the air cleaner can cause a
slight enrichment
of the mixture
Paul
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