How to easily test for Weak/Rich mixture (manual choke systems only)?
Advice applies to Holley, Webber, SU & Zenith Stromberg Carburettors, and is critical for good engine torque economy, and efficiency (regardless of how much you spent on other expensive bits). The CO & HC Emission test/set-up that you may have had carried out for your MOT or Service, can be quite misleading. The reason for this is that they are generally only tested at idle, or low RPM. When tested at idle this has very little reference to your actual fuel mixture when driving, as the carburettor will now be reliant on its needle and valve profile to correctly supply the most efficient fuel/air ratio at all engine speeds and load conditions. When tested at low RPM this is only relevant to low-speed, low-engine load conditions and again cannot be of great importance. One way of telling how the mixtures are, without putting it on a rolling road is to introduce a little choke at varying engine loads, and see how it responds. To See: 1, If the performance stays the same 2, it it floods/los
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