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To evaluate and optimize multi-cylinder engine performance (output, fuel economy, exhaust gas emission, vibration, etc.), it is necessary to clarify the quantities of air and fuel distributed to each cylinder according to the engine speed and the carburetor throttle opening, and to clarify the correlation between the above characteristics and the engine performance. From this point of view, some "survey" fuel with a known quantity was supplied to the position just in front of the intake valve of each cylinder of a provided test engine to obtain the distributed quantities in each cylinder from the changes of air-fuel ratio at that time, and the accuracy of this method was studied accordingly.