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Table 2 Accuracy of measurements and uncertainty of computed results

From: Study and the effects of ignition timing on gasoline engine performance and emissions

Measurements Accuracy
 Soot density ±1 mg/m3
 NOx ±5 ppm
 CO ±3 ppm
 HC ±2 ppm
 Time ±0.5 %
 Speed ±2 rpm
 Torque ±0.1 N m
Computed results Uncertainty
 Fuel volumetric rate ±1 %
 Power ±1 %
 Specific fuel consumption ±1.5 %
 Efficiency ±1.5 %