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7.3L IDI Turbo Diesel Engine Performance Specifications

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Old 04-21-2012, 02:32 PM
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7.3L IDI Turbo Diesel Engine Performance Specifications

7.3L IDI Turbo Diesel Engine Performance Specifications
Engine Model A-185, A-166
Number of Cylinders 8
Configuration OHV V8
Bore 104.39 mm (4.11 inch)
Stroke 106.20 mm (4.18 inch)
Displacement 7.3 Liters (444 cu inch)
Crankshaft Rotation (Viewed from
Flywheel End of Engine) Counterclockwise
Compression Ratio 21.5:1
Firing Order 1-2-7-3-4-5-6-8
Idle Speed (No Load)* 650 rpm ± 50 rpm
Governor Speed (No Load) 3660 ± 50 rpm
Governor Speed (Full Load Rated) 3000 rpm
Timing (Dynamic) 8.5 ± 2 Degrees BTDC
Injection Pump Stanadyne DB-2
Injection Nozzle
Opening Pressure (New) 13,100 ± 517 kPa (1,900 ± 75 psi)
Opening Pressure (Minimum) 9,998 kPa (1,450 psi)
Crankcase Pressure-No Load (Maximum) 20 kPa (6 in-H2O) @ 3000 rpm
Fuel Pressure (Filter Inlet) 14 kPa (2 psi) @ idle
Fuel Pressure (Filter Outlet) 7 kPa (1 psi) @ 3000 rpm
Fuel Pump Suction 20 kPa (6 in. H2O) @ 3000 rpm
Fuel Return Line Pressure 14 kPa (2 psi) @ 3000 rpm
Valve Lifter 0
Valve Lash
Engine Lube Oil Pressure
Low Idle, Minimum 69 kPa (10 psi)
(Engine at Operating Temperature) 276-482 kPa (40-70 psi)
Crankcase Capacity (Without Filter) 8.5 L (9 qt.)
Crankcase Capacity (With Filter) 9.5 L (10 qt.)
Thermostat Opening Temperature 89°C (192°F)
* Manual transmission in NEUTRAL position. Automatic transmission in DRIVE position.
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Old 04-21-2012, 02:33 PM
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was just setting my timing and couldn't remember if idle was 650 or 700.so i grabbed this while googling quick for safe keeping.
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Old 04-21-2012, 03:10 PM
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Thanks for the specs...both useful and interesting.
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Old 04-21-2012, 04:29 PM
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Awesome find!
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Old 04-21-2012, 09:12 PM
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ahh. the dreaded "you need to spread the rep around" message. good find F250.
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Old 04-24-2012, 03:26 AM
kenworth90 kenworth90 is offline
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How can i get more oil pressure out of a 1991 7.3 IDI...I'm runnin about 10-20 pds @600-700 rpm and about 40-45 pds @2100 @ normal operating temp...I don't like the low at the idel though I'd like to see both ends up about 10-15 pds...Is there a better oil pump for my truck out there???
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Old 04-24-2012, 07:29 AM
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10 lbs per 1000 rpm. Your doing fine. Volume is more critical than pressure, 70 pounds of oil pressure is near worthless if the clearances are too small.
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Old 04-24-2012, 07:55 PM
Marianna2003 Marianna2003 is offline
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Oil flow is more important than oil pressure. Low pressure means more flow with a positive displacement pump. The film strength of the oil and its additives are what is preventing wear. The system pressure just makes sure that the heat generated is carried away and a fresh supply of oil is there to replace what has been heated up & squished away.
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Old 05-22-2012, 06:01 AM
385seriesHemi 385seriesHemi is offline
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Relieving oil pressure will release some horsepower and torque. To improve any oil flow, you must remove all casting flash and radius each edge within the system. Drain back is just as important as exiting the pump.
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Old 05-22-2012, 03:02 PM
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Quote:
Originally Posted by 385seriesHemi View Post
Relieving oil pressure will release some horsepower and torque. To improve any oil flow, you must remove all casting flash and radius each edge within the system. Drain back is just as important as exiting the pump.
Horsepower = Pressure (PSIG) × Flow (GPM)/ 1714
Assume approx 1 GPM per 1000 RPM
HP=55 PSI X 2 GPM / 1714 = .064 HP = not worth the effort for HP gain
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Old 05-22-2012, 07:31 PM
385seriesHemi 385seriesHemi is offline
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Yeah, its not much but it could be the difference maker.
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