TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download

Table 8-4. Fuel Temperature Correction Temp. °F 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 Corr .000 +.001 +.002 +.003 + .004 + .005 + .006 +.007 + .008 +.009 +.010 +.011 +.012 +.013 +.014 +.015 +.016 +.017 +.018 +.019 Fuel Flow No. / Hr. Max. 313.0 312.7 312.4 312.1 311.8 311.5 311.2 310.9 310.6 310.3 310.0 309.7 309.4 309.1 308.8 308.5 308.2 307.9 307.6 307.3 Table 8-5. Fan Horsepower to be Used for Correcting Engine Gross Horsepower Engine Speed (rpm) 2520 2400 2200 2000 1800 1600 1400 1200 1000 900 125.0 108.0 83.5 62.5 45.6 32.0 21.5 13.5 7.2 5.7 FORMULAE - AVDS-1790-2A = 3.1416 N = RPM of Dynamometer shaft T = Torque in lb. ft = LWZ L = Length of torque arm in feet W = Weight of scale reading (lbs) (Beam reading) Z = Scale reading factor (ratio to actual weight, in units) If length of torque arm is 21.00 inches or 1.75 feet, and scale reading factor is 3, then OBHP = W N 1000 Fuel Flow Temp. °F Corr No. / Hr. Max. — 80 +.020 307.0 81 +.021 306.7 82 +.022 306.4 83 + .023 306.1 84 +.024 305.8 85 + .025 305.5 86 +.025 305,2 87 +.027 304.9 88 +.028 304.6 89 +.029 304.3 90 +.030 304.0 91 +.031 303.7 92 +.032 303.4 93 +.033 303.1 94 +.034 302.8 95 +.035 302.5 96 +.036 302.2 97 +.037 301.9 98 +.038 301,6 99 + .039 301.3 2. Corrected net BHP -Observed BHP x) 1 + air temp. correction + Induction air pressure correction + fuel temperature correction) 3. Gross horsepower = corrected net BHP + fan horsepower. 4. Correction factor references a. Induction air temperature correction factor - Table 8-2 b. Induction air pressure correction factor - Table 8-3 c. Fuel temperature correction factor and maximum fuel flow - Table 8-4 5. Specific fuel consumption = Fuel flow lb/ hr. Corrected gross BH P 6. Specific oil consumption = Oil Consumption lb/ hr. Corrected gross BHP 7. Fuel Air Ratio = Fuel lb/ hr. Air lb/ hr. SAMPLE CALCULATIONS: Example: rpm = 2400 torque = 1339 beam = 255 wet barometer = 29.64 1. Dry barometer = 29.35 2. Average entrance pressure in inches of water = 0 8-11