ProBike Motorcycle Workshop Equipment

Dynamometers

Air/Fuel Metering
Fuchs Options - Air/Fuel Measurement ("Lambda Sensor")

Air/Fuel metering - Tuning has never been easier with the air fuel ratio module that takes the guesswork out of fuelling adjustments. The Fuchs system uses a heated wide range lambda (oxygen) sensor to quickly measure air / fuel ratio while tuning carburetted or fuel injected motorcycles. This shows a live air/fuel ratio while testing the motorcycle, together with a real time air/fuel curve superimposed on the power & torque curve. Additional analysis can be carried out depending on other options fitted.

The Fuchs air/fuel system can be used with either an inertia or eddy current dyno. The heated wide range sensor is able to quickly measure air/fuel ratio while performing any test. Using compressed air to pull the gases over the Lambda sensor (venturi effect) makes the system quicker to react and more accurate at low rpm.

Although other dynamometer manufacturers enthuse about air/fuel metering, it is worth mentioning the shortcomings. Air/fuel metering provides a quick indication of the richness of the mixture but is no use for diagnostic work. If you have an air leak in the exhaust or a valve sticking on one cylinder, air will be introduced into the system giving a false lean indication. Some bikes actually use air injection as a means to reduce emissions. If all valve clearances are correct and the integrity of the exhaust is assured, then the air/fuel ratio (or "Lambda") can be used to gauge mixture ratio. 4-gas analysis is far better for diagnosing individual cylinder problems and any bike with carburation that is too far from the norm. It is very common to have a situation where an air/fuel meter will lead you up the garden path. Being able to see unburnt fuel, CO, CO2 as well as Oxygen is a huge advantage in these circumstances.
And, remember - tune for power, not air/fuel ratio.

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