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1. Weichai America Corp.
WP4GNA
Std Metric
Basic Data
Type
Number of cylinders
Aspiration
Bore in mm 4.13 105 4.13 105
Stroke in mm 5.12 130 5.12 130
Displacement in
3
L 274.8 4.5 274.8 4.5
Lambda
Compression Ratio
Mean Piston Speed ft/min m/s 853.0 4.3 1876.6 9.5
Rotation Viewed from Flywheel
Firing Order
Gross Prime Power Rating1,2,3
Per ISO 3046 at the Flywheel
NG HP kW 41 31 73 54
LP HP kW 44 33 48 36
NG lbf·ft N·m 218 295 174 236
LP lbf·ft N·m 232 314 114 155
MEP (@ rated Load on NG) psi bar 119.5 8.2 95.5 6.6
MEP (@ rated Load on LP) psi bar 127.2 8.8 62.8 4.3
Thermal Balance
Total Fuel ft3
/hr kg/hr 348.0 7.1 674.4 13.7
Heat to Work btu/min kW 1757 31 3088 54
Heat rejected to Cooling water at rated Load btu/min kW 2025 36 4055 71
Heat Rejection per CAC btu/min kW —— —— —— ——
Exhaust Heat (LHV TO 77oF) btu/min kW 1553 27 2969 52
Engine Radiated Heat btu/min kW 535 9 1268 22
Weight and Power Output
Dry Weight
Fan to Flywheel lb kg 1102 500 1102 500
Rad to Flywheel lb kg 1168 530 1168 530
Wet Weight
Fan to Flywheel lb kg 1142 518 1142 518
Rad to Flywheel lb kg 1235 560 1235 560
Maximum Allowable Bending Moment at Rear of Block lbf·ft N·m 5458 7400 5458 7400
Moment of Inertia About Roll Axis lb·ft
2
kg·m
2
17.7 3.6 17.7 3.6
Flywheel housing
Flywheel
Number of Flywheel Teeth
Exhaust System
Type
Maximum allowable Back pressure inHg kPa 4.4 15.0 4.4 15.0
Standard Catalyst Back pressure inHg kPa 2.5 8.6 2.5 8.6
Exhaust Outlet Pipe Size (exhaust manifold to catalyst inlet) in mm 2.28→1.96 58→50 2.28→1.96 58→50
Maximum Turbine Inlet Temperature Ԭ Ԩ 1508 820 1508 820
Exhaust Flow at Rated Power lb/hr kg/hr 287.4 130.5 1069.0 207.2
Air Induction System
Maximum allowable Intake Air Restriction with Air Cleaner
Clean inH2O kPa 14.1 3.5 14.1 3.5
Dirty inH2O kPa 24.1 6.0 24.1 6.0
Combustion Air required (entire engine) lb/hr kg/hr 275.3 125.0 440.5 200.0
Combustion Air required (entire engine) CFM m3
/min 57.0 1.6 57.0 1.6
Charge Air Cooler
Compressor Outlet Temperature Ԭ Ԩ —— —— —— ——
Compressor Flow Rate per CAC lb/hr kg/hr —— —— —— ——
CAC Rise over Ambient (Charge)
Specified Ԭ Ԩ —— —— —— ——
Acutal Ԭ Ԩ —— —— —— ——
Max pressure loss across the CAC inH2O kPa 48.2 12.0 48.2 12.0
Maximum Intake Air Temperature (IAT) Ԭ Ԩ 180 82 180 82
ECU IAT Warning Ԭ Ԩ 170 77 170 77
ECU IAT Shutdown Ԭ Ԩ 180 82 180 82
Cooling System
Coolant Capacity
Engine only gal L 2.1 8.0 2.1 8.0
Engine with Radiator gal L 5.0 19.0 5.0 19.0
Engine Coolant Flow gal/min L/min 31.2 118.0 54.6 206.7
4.5 L 201809V2
Units Specificaiton
1000 2200
N/A 1
N/A 9.75
N/A Counter clockwise
N/A In-Line 4 cycle
N/A 4
N/A Naturally Aspirated
N/A 1-3-4-2
Air Cooled Manifold
N/A SAE No.3 SAE No.3
N/A No.11.5 No.11.5
N/A 145 145
1
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Document Courtesy of Fly Parts Guy Co.
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2. Weichai America Corp.
WP4GNA
Std Metric
4.5 L 201809V2
Units Specificaiton
1000 2200
Water Pump Speed
Standard Thermostat Range
Cracking Temperature Ԭ Ԩ 169 76 169 76
Full Open Temperature Ԭ Ԩ 194 90 194 90
Maximum Allowable Pressure Cap psi bar 7.3 0.5 10.2 0.7
Ambient Clearance Open Genset (water) (Air-to-Boil)
Specified Ԭ Ԩ ≥107 ≥42 ≥107 ≥42
Acutal Ԭ Ԩ 122 50 122 50
Maximum Allowable Top Tank Temperature Ԭ Ԩ 215 102 215 102
ECU Warning Ԭ Ԩ 205 96 205 96
ECU Shutdown Ԭ Ԩ 215 102 215 102
Fan Power HP kW 0.6 0.4 3.0 2.2
Fan Diameter, including blades in mm 18.3 466 18.3 466
Fan Speed
Electrical System
Minimum Recommended Battery Capacity
Cold Cranking Current
Engine only
Engine with Drive train
Maximum Allowable Resistance of Starting Circuit
Starting Motor Power HP kW 5.4 4.0 5.4 4.0
Battery Charging Alternator
Voltage
Current
Coil primary Resistance
Spark Plug p/n
Spark plug gap
Lubrication System
Oil Specification
Oil Pressure
Idle
Min psi Bar 11.6 0.8 11.6 0.8
Max psi Bar 17.4 1.2 17.4 1.2
Rated Speed
Min psi Bar 43.5 3.0 43.5 3.0
Max psi Bar 95.7 6.6 95.7 6.6
Maximum Allowable Oil Temperature Ԭ Ԩ 239 115 239 115
Engine Oil Capacity
Min Qts L 9.5 9.0 9.5 9.0
Max Qts L 12.7 12.0 12.7 12.0
Oil Filter Capacity Qts L 1.4 1.3 1.4 1.3
ECU Oil Pressure Warning psi kPa 10.2 70.0 10.2 70.0
ECU Oil Pressure Shut Down psi kPa 7.1 49.0 7.1 49.0
Fuel System
Fuel Consumption
NG ft3
/hr kg/hr 348.0 7.1 674.4 13.7
LP ft
3
/hr kg/hr 413.5 8.4 679.3 13.8
Maximum EPR Rated Pressure psi kPa 1.0 6.9 1.0 6.9
Maximum Running pressure to Electronic Pressure Regulator (EPR) inH2O kPa 10.8 2.7 10.8 2.7
Minimum Running pressure to EPR inH2O kPa 6.8 1.7 6.8 1.7
Minimum Gas Supply Pipe Size
Maximum EPR Rated Pressure psi kPa 1.0 6.9 1.0 6.9
Maximum Running Pressure to EPR inH2O kPa 10.8 2.7 10.8 2.7
Minimum Running Pressure to EPR inH2O kPa 6.8 1.7 6.8 1.7
Minimum LPG Supply Pipe Size
4
RPM 1400 3080
RPM 1400 3080
CCA 600 600
Ohms 0.002 0.002
AH 150 150
CCA 600 600
Ohms 0.59Ω ± 10% 0.59Ω ± 10%
TORCH/R 5498-3 TORCH/R 5498-3
Volts 14 14
Amps 70 70
mm 0.30-0.35 0.30-0.35
SAE 15W-40 Low Ash Gas engine oil (0.25-0.50% by wt), API CD/CF or
higher; Please refer Manual book for different situation.
1-1/4" NPT
1/4" NPT
2
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Document Courtesy of Fly Parts Guy Co.
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3. Weichai America Corp.
WP4GNA
Std Metric
4.5 L 201809V2
Units Specificaiton
1000 2200
Power Curve vs. Speed (Natural Gas)
Fuel Consumption Curve vs. Speed (Natural Gas)
Power Curve vs. Speed (Liquid Propane Gas )
20
25
30
35
40
45
50
55
230
240
250
260
270
280
290
300
900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200
濄濣濫濙濦澜濟濋澝
Speed (rpm)
濈濣濦濥濩濙澜濂澢濡澝
25
30
35
40
45
50
55
150
180
210
240
270
300
330
Power
(kW)
Torque
(N.m)
Speed (rpm)
8
10
12
14
16
18
20
22
220
225
230
235
240
245
250
255
900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200
Total
Fuel漏m³/h)
Speed (rpm)
BSFC漑g/kW.h漒
3
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Document Courtesy of Fly Parts Guy Co.
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4. Weichai America Corp.
WP4GNA
Std Metric
4.5 L 201809V2
Units Specificaiton
1000 2200
Fuel Consumption Curve vs. Speed (Liquid Propane Gas)
Net Power data (Natural Gas)
Speed (RPM) 1000 1200 1500 1800 2000 2200
Gross Power (kW) 30.9 36.7 44.2 50.2 52.6 54.3
Fan Power (kW) 0.3 0.4 0.8 1.3 1.7 2.2
Net Power (kW) 30.6 36.3 43.4 48.9 50.9 52.1
Net Power data (Liquid Propane Gas)
Speed (RPM) 1000 1500 1800 2200
Gross Power (kW) 32.4 45.3 49.9 35.7
Fan Power (kW) 0.3 0.8 1.3 2.2
Net Power (kW) 32.1 44.5 48.6 33.5
4
The preceeding pipe sizes are only suggestions and piping sizes may vary with temperature, pressure, distance from supply and application of local codes. Gas must
be available at adequate volume and pressure for engine at the EPR.
1
Standby and overload ratings based on ISO3046.
2
All ratings are gross flywheel horsepower corrected to 77o
F at an altitude of 328 feet with no cooling fan or alternator losses using heating value for NG of 1025
BTU/SCF (HHV) and for propane of 2490 BTU/SCF (HHV).
3
Production tolerances in engines and installed components can account for power variations of +/- 5%. Altitude, temperature and excessive exhaust and intake
restrictions should be applied to power calculations. Engine maybe operated at : up to 1200 feet and 86°F without power deration. For sustained operation above
these conditions, derate by 2.5% per 1000 feet, and 1.5% per 10°F.
3.5
4.0
4.5
5.0
5.5
6.0
6.5
230
240
250
260
270
280
290
TotalFuel˄gallom/h˅
BSFC
(g/kW.h)
Speed (rpm)
4
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Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com

5. Weichai America Corp.
WP4GNA
Std Metric
Basic Data
Type
Number of Cylinders
Aspiration
Bore in mm 4.1 105 4.1 105
Stroke in mm 5.1 130 5.1 130
Displacement in3
L 274.8 4.5 274.8 4.5
Lambda
Compression Ratio
Mean Piston Speed ft/min m/s 1279.5 6.5 1535.4 7.8
Rotation Viewed from Flywheel
Firing Order
Gross Standby Power Rating1,2,3
Per ISO 3046 at the Flywheel
NG HP kW 59 44 67 50
LP HP kW 63 47 66 49
MEP (@ rated Load on NG) psi bar 114.0 7.9 107.9 7.4
MEP (@ rated Load on LP) psi bar 121.4 8.4 105.1 7.2
Thermal Balance
Total Fuel ft3
/hr kg/hr 511.0 10.4 590.7 12.0
Heat to Work btu/min kW 2500 44 2836 50
Heat rejected to Cooling water at rated Load btu/min kW 2597 46 3005 53
Heat Rejection per CAC btu/min kW —— —— —— ——
Exhaust Heat (LHV TO 77oF) btu/min kW 2318 41 2721 48
Enigne Radiated Heat btu/min kW 1136 20 1410 25
Gross Prime Power Rating1,2,3
Per ISO 3046 at the Flywheel
NG HP kW 59 44 67 50
LP HP kW 63 47 66 49
MEP (@ rated Load on NG) psi bar 114.0 7.9 107.9 7.4
MEP (@ rated Load on LP) psi bar 121.4 8.4 105.1 7.2
Thermal Balance
Total Fuel ft3
/hr kg/hr 511.0 10.4 590.7 12.0
Heat to Work btu/min kW 2500 44 2836 50
Heat rejected to Cooling water at rated Load btu/min kW 2597 46 3005 53
Heat Rejection per CAC btu/min kW —— —— —— ——
Exhaust Heat (LHV TO 77oF) btu/min kW 2318 41 2721 48
Engine Radiated Heat btu/min kW 1136 20 1410 25
Weight and Power Output
Dry Weight
Fan to Flywheel lb kg 1102 500 1102 500
Rad to Flywheel lb kg 1168 530 1168 530
Wet Weight
Fan to Flywheel lb kg 1142 518 1142 518
Rad to Flywheel lb kg 1235 560 1235 560
Maximum Allowable Bending Moment at Rear of Block lbf·ft N·m 5458 7400 5458 7400
Moment of Inertia About Roll Axis lb·ft2
kg·m2
17.7 3.6 17.7 3.6
Flywheel housing
Flywheel
Number of Flywheel Teeth
Exhaust System
Type
Maximum allowable Back pressure inHg kPa 4.4 15.0 4.4 15.0
Standard Catalyst Back pressure inHg kPa 2.5 8.6 2.5 8.6
Exhaust Outlet Pipe Size (exhaust manifold to catalyst inlet) in mm 2.28→1.96 58→50 2.28→1.96 58→50
Maximum Turbine Inlet Temperature Ԭ Ԩ 1508 820 1508 820
Exhaust Flow at Rated Power lb/hr kg/hr 409.7 186.0 444.9 202.0
Air Induction System
Maximum allowable Intake Air Restriction with Air Cleaner
Clean inH2O kPa 14.1 3.5 14.1 3.5
Dirty inH2O kPa 24.1 6.0 24.1 6.0
Combustion Air required (entire engine) lb/hr kg/hr 275.3 125.0 440.5 200.0
Combustion Air required (entire engine) CFM m3
/min 57.0 1.6 57.0 1.6
4.5 L 201809V2
Units Specificaiton
1500 1800
N/A 1
N/A 9.75
N/A Counter clockwise
N/A In-Line 4 cycle
N/A 4
N/A Naturally Aspirated
N/A SAE No.3 SAE No.3
N/A 1-3-4-2
N/A No.11.5 No.11.5
N/A 145 145
Air Cooled Manifold
1
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Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com

6. Weichai America Corp.
WP4GNA
Std Metric
4.5 L 201809V2
Units Specificaiton
1500 1800
Charge Air Cooler
Compressor Outlet Temperature Ԭ Ԩ —— —— —— ——
Compressor Flow Rate per CAC lb/hr kg/hr —— —— —— ——
CAC Rise over Ambient (Charge)
Specified Ԭ Ԩ —— —— —— ——
Acutal Ԭ Ԩ —— —— —— ——
Max pressure loss across the CAC inH2O kPa 48.2 12.0 48.2 12.0
Maximum Intake Air Temperature (IAT) Ԭ Ԩ 180 82 180 82
ECU IAT Warning Ԭ Ԩ 170 77 170 77
ECU IAT Shutdown Ԭ Ԩ 180 82 180 82
Cooling System
Coolant Capacity
Engine only gal L 2.1 8.0 2.1 8.0
Engine with Radiator gal L 5.0 19.0 5.0 19.0
Engine Coolant Flow gal/min L/min 33.9 128.3 40.5 153.3
Water Pump Speed
Standard Thermostat Range
Cracking Temperature Ԭ Ԩ 169 76 169 76
Full Open Temperature Ԭ Ԩ 194 90 194 90
Maximum Allowable Pressure Cap psi bar 10.2 0.7 10.2 0.7
Ambient Clearance Open Genset (water) (Air-to-Boil)
Specified Ԭ Ԩ ≥107 ≥42 ≥107 ≥42
Acutal Ԭ Ԩ 122 50 122 50
Maximum Allowable Top Tank Temperature Ԭ Ԩ 215 102 215 102
ECU Warning Ԭ Ԩ 205 96 205 96
ECU Shutdown Ԭ Ԩ 215 102 215 102
Fan Power HP kW 1.1 0.8 1.8 1.3
Fan Diameter, including blades in mm 18.3 466 18.3 466
Fan Speed
Electrical System
Minimum Recommended Battery Capacity
Cold Cranking Current
Engine only
Engine with Drive train
Maximum Allowable Resistance of Starting Circuit
Starting Motor Power HP kW 5.4 4.0 5.4 4.0
Battery Charging Alternator
Voltage
Current
Coil primary Resistance
Spark Plug p/n
Spark plug gap
Lubrication System
Oil Specification
Oil Pressure
Idle
Min psi Bar 11.6 0.8 11.6 0.8
Max psi Bar 17.4 1.2 17.4 1.2
Rated Speed
Min psi Bar 43.5 3.0 43.5 3.0
Max psi Bar 95.7 6.6 95.7 6.6
Maximum Allowable Oil Temperature Ԭ Ԩ 239 115 239 115
Engine Oil Capacity
Min Qts L 9.5 9.0 9.5 9.0
Max Qts L 12.7 12.0 12.7 12.0
Oil Filter Capacity Qts L 1.4 1.3 1.4 1.3
ECU Oil Pressure Warning psi kPa 10.2 70.0 10.2 70.0
ECU Oil Pressure Shut Down psi kPa 7.1 49.0 7.1 49.0
Fuel System
Fuel Consumption
NG ft3
/hr kg/hr 511.0 10.4 590.7 12.0
LP ft3
/hr kg/hr 590.7 12.0 625.2 12.7
RPM 2100 2520
RPM 1905 2268
CCA 600 600
Ohms 0.002 0.002
AH 150 150
CCA 600 600
Ohms 0.59Ω ± 10% 0.59Ω ± 10%
TORCH/R 5498-3 TORCH/R 5498-3
Volts 14 14
Amps 70 70
0.30-0.35
SAE 15W-40 Low Ash Gas engine oil (0.25-0.50% by wt), API CD/CF or higher;
Please refer Manual book for different situation.
mm 0.30-0.35
2
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com
Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com

7. Weichai America Corp.
WP4GNA
Std Metric
4.5 L 201809V2
Units Specificaiton
1500 1800
Maximum EPR Rated Pressure psi kPa 1.0 6.9 1.0 6.9
Maximum Running pressure to Electronic Pressure Regulator (EPR) inH2O kPa 10.8 2.7 10.8 2.7
Minimum Running pressure to EPR inH2O kPa 6.8 1.7 6.8 1.7
Minimum Gas Supply Pipe Size
Maximum EPR Rated Pressure psi kPa 1.0 6.9 1.0 6.9
Maximum Running Pressure to EPR inH2O kPa 10.8 2.7 10.8 2.7
Minimum Running Pressure to EPR inH2O kPa 6.8 1.7 6.8 1.7
Minimum LPG Supply Pipe Size4
Fuel Consumption Curve @ 1500 RPM (Natural Gas)
Fuel Consumption Curve @ 1500 RPM (Liquid Propane Gas)
1-1/4 NPT
1/4 NPT
0
2
4
6
8
10
12
14
16
18
20
200
250
300
350
400
450
500
550
600
650
700
4.6 11.5 13.7 22.7 34.2 38.8 43.9
Total
Fuel(m³/h)
Power (kW)
BSFC(g/kW.h)
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
230
280
330
380
430
480
530
580
630
680
濃 濈 濄濃 濄濈 濅濃 濅濈 濆濃 濆濈 濇濃 濇濈 濈濃
Total
Fuel(galloon/h)
BSFC(g/kW.h)
Power (kW)
3
Document Courtesy of Fly Parts Guy Co.
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Document Courtesy of Fly Parts Guy Co.
www.FlyPartsGuy.com

8. Weichai America Corp.
WP4GNA
Std Metric
4.5 L 201809V2
Units Specificaiton
1500 1800
Fuel Consumption Curve @ 1800 RPM (Natural Gas)
Fuel Consumption Curve @ 1800 RPM (Liquid Propane Gas)
2
All ratings are gross flywheel horsepower corrected to 77o
F at an altitude of 328 feet with no cooling fan or alternator losses using heating value for NG of 1025 BTU/SCF
(HHV) and for propane of 2490 BTU/SCF (HHV).
3
Production tolerances in engines and installed components can account for power variations of +/- 5%. Altitude, temperature and excessive exhaust and intake restrictions
should be applied to power calculations. Engine maybe operated at : up to 1200 feet and 86°F without power deration. For sustained operation above these conditions,
derate by 2.5% per 1000 feet, and 1.5% per 10°F.
4
The preceeding pipe sizes are only suggestions and piping sizes may vary with temperature, pressure, distance from supply and application of local codes. Gas must be
available at adequate volume and pressure for engine at the EPR.
1
Standby and overload ratings based on ISO3046.
2
4
6
8
10
12
14
16
18
200
250
300
350
400
450
500
550
600
7.5 13.0 26.0 31.3 39.0 44.1 50.2
Total
Fuel漑m³/h漒
Power (kW漒
BSFC漑g/kW.h漒
1
2
3
4
5
6
7
8
9
200
250
300
350
400
450
500
550
600
濇 濋 濄濅 濄濉 濅濃 濅濇 濅濋 濆濅 濆濉 濇濃 濇濇 濇濋 濈濅
Total
Fuel
(gal/h)
BSFC(g/kW.h)
Power (kW)
4
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Document Courtesy of Fly Parts Guy Co.
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