Question

Solve for air/fuel ratio on each engine for each given engine speed along with the equation used.

Measured Performance Data - Engine A Engine Speed Torque (lb-ft) Airflow (cfm) Fuel Flow (bm/hr) 120 160 208 1000 1200 1400 1600 1800 2000 2200 2400 370 418 425 423 426 395 250 30.8 35.8 40.6 45.4 50.0 53.4 57.4 57.2 Displacement: 6.6L (402.6 in) #cylinders: 6 Bore: 105.025mm (4.135 in) Stroke: 127mm (5.Oin) Comp. Ratio: 16.5:1 2 valves/cylinder Turbocharged 290 336 382 406 379 333

Answer 1

2200 and Torque = 379 lb-ft Air flow = 382X0:0765*60 =1753:38 Lbm/hor 2. Airfuel ratio = 1753.38 2130 2400 and Torque = 333 lb-ft Air flow 240600.0765x60 = 1863.54 lbm / hor Air/fuel reatio = 1863.54 = 32.58. 57.4 =130.547 57.2

These are the air/fuel ratio on mass basis for those given RPM & Torque

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