18
BA-921
®
COMPRESSOR SPECIFICATIONS (ALL)
Typical weight:
Standard Compressor (DDC Model) ............................... 66 lbs.
Closed Room Compressor (DDC Model) ........................ 55 lbs.
Number of cylinders ......................................................................... 1
Bore Diameter ....................................................... 3.622 in. (92 mm)
Stroke ................................................................... 2.126 in. (54 mm)
Calculated displacement at 1250 RPM .............................. 15.8 CFM
Flow Capacity @ 1800 RPM & 120 PSI ............................... 11.6 CFM
Flow Capacity @ 3000 RPM & 120 PSI ............................... 16.5 CFM
Approximate horsepower required:
Loaded 1800 RPM at 120 PSIG ............................................... 4.6 HP
Unloaded 1800 RPM ................................................................ 0.8 HP
Minimum coolant fl ow at maximum RPM ..................... 2.5 Gals./Min.
Maximum inlet air temperature ................................................. 250°F
Maximum discharge air temperature ........................................ 400°F
Minimum oil pressure required ................................................. 15 PSI
Minimum oil-supply line size ................................................ 3/16" I.D.
Minimum unloader-line size ................................................. 3/16" I.D.
Minimum Governor Cut-out Pressure ......................................120 PSI
TORQUE SPECIFICATIONS: Standard
Compressor
Assembly Torques in inch pounds (in. Ibs.)
M8x1.25-6g Cylinder Head.............265-292 In. Lbs. (30-33 N•m)
M5x0.75-6g Unloader Cap .................... 62-71 In. Lbs. (7-8 N•m)
M8x1.25-6g Governor Adapter .......195-213 In. Lbs. (22-24 N•m)
M8x1.25-6g Rear End Cover ..........195-213 In. Lbs. (22-24 N•m)
M6x1.00-6g Crankcase Cover ............. 62-71 In. Lbs. (7-8 N•m)
Inlet Port Fittings
1 3/16"-12 UN-2B (Aluminum Cylinder Head)
straight fi tting ............................841-925 In. Lbs. (95-104 N•m)
adjustable (w/ jam nut) ...............597-655 In. Lbs. (67-74 N•m)
M27x2-6g (Cast Iron Cylinder Head) .....885-980 In. Lbs. (100-111
N•m)
Discharge Port Fittings
7/8"-14 UNF-2B (Aluminum Cylinder Head)
straight fi tting ..............................509-553 In. Lbs. (57-62 N•m)
adjustable (w/ jam nut) ...............354-389 In. Lbs. (40-44 N•m)
M22 x 1.5-6g (Cast Iron Cylinder Head) ..531-575 In. Lbs. (60-65
N•m)
Water Port Fittings
3/4"-16 UNF-2B (Aluminum Cylinder Head)
straight fi tting ..............................265-292 In. Lbs. (30-33 N•m)
adjustable (w/ jam nut) ...............248-274 In. Lbs. (28-31 N•m)
M18 x 1.5-6g (Cast Iron Cyliner Head) ....354-395 In. Lbs. (40-45
N•m)
Unloader Port Fittings
1/8"-27 NPT ................................................................ 2 - 3 TFFT
1
M10 x 1.5-6g ..................................120-145 In. Lbs. (14-16 N•m)
Safety Valve Port
7/8"-14 UNF-2B .............................230-257 In. Lbs. (26-29 N•m)
M16x1.5-6H ...................................230-257 In. Lbs. (26-29 N•m)
Oil Port
7/16"-16 UNF .................................150-170 In. Lbs. (17-19 N•m)
Special Attachments – Cat C11/C13 Engine Crankcase Cover
w/ Oil Jet and Associated Hardware (Figure 17)
1) Crankcase Cover (In/Out) Oil Fittings
7/16"-16 UNF .............................150-170 In. Lbs. (17-19 N•m)
2) Compressor Oil Supply Fitting
7/16"-16 UNF .............................150-170 In. Lbs. (17-19 N•m)
3) Metal Tube (Tube Ends)
7/16"-16 UNF .........................130-150 In. Lbs. (16-17.5 N•m)
Option: Run fi ttings down fi nger tight. Tighten ¼ to ½
turns.
1
Note: TFFT = Turns From Finger Tight
TORQUE SPECIFICATIONS: Closed Room
Compressor
Assembly Torques in inch pounds (in. Ibs.)
M8x1.25-6g Cylinder Head......270-305 In. Lbs. (30.5-34.5 N•m)
M5x0.75-6g Unloader Cap ....................62-71 In. Lbs. (7-8 N•m)
M8x1.25-6g Governor Adapter ......195-213 In. Lbs. (22-24 N•m)
M8x1.25-6g Rear End Cover .........195-213 In. Lbs. (22-24 N•m)
M6x1.00-6g Crankcase Cover ............. 62-71 In. Lbs. (7-8 N•m)
Inlet Port Fittings
M27x2-6g. Inlet Port Fittings ...991-1089 In. Lbs. (112-123 N•m) ..
Discharge Port Fittings
M22x1.5-6H ................................814-912 In. Lbs. (92-103 N•m) ..
Water Port Fittings
M18x1.5-6H ..................................593-637 In. Lbs. (67-72 N•m)
Unloader Port Fittings
1/8"-27 NPT ............................................................... 2 - 3 TFFT
1
Safety Valve Port
M16x1.5-6H ..................................230-257 In. Lbs. (26-29 N•m)
1
Note: TFFT = Turns From Finger Tight
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