The development of sophisticated electronic control systems plus a robust exhaust oxygen sensor allowed the three way exhaust catalyst to be introduced. o Turn 2-3 flats towards Lean after achieving Bunsen Blue with occasional splash of Yellow (as achieved above)

NOTE:A multi-cylinder engine with a carburettor (or injector) to each cylinder and a single exhaust system can not be thoroughly tested with a gas analyser at the tailpipe. The analyser only gives an average fuel mixture indication for all cylinders and no warning of large mixture variations due to setting errors or indication of other faults.

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When there is too much air in the mixture, it becomes more difficult to ignite, burns slower, and is therefore less efficient. Separate injectors are placed close to the inlet valves rather than in the main throttle body.The manifold system is designed with a suitable inlet tract length to enhance engine performance. This feeds from a larger chamber and throttle body which does not have the same dimensional restrictions as the single point system because it feeds air only Idle mixture and idle speed, are the two adjustments that may be provided on early systems. This "female" type of nipple seems to be required to fit the "male" end of the Gunson adapter, but I don't know whether the size and thread pitch (which may not be "universal") are necessarily going to be compatible, and, as noted in the initial post, I've been told that they aren't. Colortune features a viewing window so the air/fuel ratio can be adjusted according to flame colour. Ideal for simple and effective engine tuning.

With Colortune installed in a warm engine and the engine running at idle speed, a regular flash of light, with a Bunsen blue flame, should be visible as the mixture is ignited in the cylinder. Often the information requires further analysis as the system does not recognize mechanical problems only the effect on electronic items and will show for example a lambda (oxygen) sensor or lambda control system fault in the case of inlet or exhaust manifold air leaks. Determination of the quantity of air going into the engine is itself a difficult task under conditions of varying temperature, varying pressure, and with extreme disruption to the flow caused by valves opening and closing at an incredible rate. Drawing it in with air under low pressure).The amount of fuel should be in proportion generally with the amount of air going into the engine, but this is adjusted slightly for economy at part throttle, higher power at full throttle and other less significant reasons.Extension H.T. lead incorporating an end suitable to connect either Champion or Continental Bosch type suppressor caps (clip or thread). A taper seat plug was introduced with a 16mm (5/8") hexagon (previously 13/16" or 20.6mm) and the 16mm hexagon size has also been used on flat seat varieties with a revised body shape. Electric generators with speed governors do not experience rapid acceleration so should have a blue flame under all operating conditions. This applies with a hot or cold engine. If enrichment is by electronic control unit (ECU) or auto-choke, test for a yellow flame when the engine is cool / cold. It is therefore an excellent detector of small percentages of oxygen and the electronic control unit (ECU) is able to continually adjust above and below the point at which the sensor has an output. The ability of the ECU to learn and adjust the programmed map of information stored in its memory, adds a further precision of control.