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G4-97 (8.5/12RES) 4/14n
Application Data
Engine
Engine Specifications 60 Hz 50 Hz
Manufacturer Kohler
Engine: model, type
8.5RES CH640 4-Cycle
12RES CH740 4-Cycle
Cylinder arrangement V-2
Displacement, L (cu. in.)
8.5RES 0.624 (38)
12RES 0.725 (44)
Bore and stroke, mm (in.)
8.5RES 77 x 67 (3.03 x 2.64)
12RES 83 x 67 (3.27 x 2.64)
Compression ratio
8.5RES 8.5:1
12RES 9.0:1
Main bearings: quantity, type 2, Parent Material
Rated rpm 3600 3000
Max. engine power at rated rpm, kW (HP)
CH640, LP vapor 11.5 (15.4) 10 (14.0)
CH640, natural gas 10.0 (13.4) 9.1 (12.2)
CH740, LP vapor 17.6 (23.6) 15.8 (21.2)
CH740, natural gas 15.3 (20.5) 13.8 (18.5)
Cylinder head material Aluminum
Valve material
Steel/Stelliter
Piston type and material Aluminum Alloy
Crankshaft m aterial Heat Treated, Ductile Iron
Governor: type Electronic
Frequency regulation, no load to full load Isochronous
Frequency regulation, steady state 0.5%
Air c leaner type Dry
Engine Electrical
Engine Electrical System
Ignition system Electronic, DSAM
Starter motor rated voltage (DC) 12
Battery charger, ampere rating 6
Battery (purchased separately):
Ground Negative
Volts (DC) 12
Battery quantity 1
Recommended cold cranking amps
(CCA) rating for --18_C(0_F)
525
Exhaust
Exhaust System 60 Hz 50 Hz
Exhaust flow at rated kW, m
3
/min. (cfm)
8.5RES 3.3 (115) 2.7 (96)
12RES 3.8 (135) 3.2 (113)
Exhaust temperature at rated kW, dry
exhaust, _C(_F)
760 (1400)
Lubrication
Lubricating System
Type Full Pressure
Oil capacity (with filter), L (qt.) 1.9 (2.0)
Oil filter: quantity, type 1, Cartridge
Oil cooler Integral
Operation Requirements
Coolin
g
A
ir
8.5RES 12RES
60 Hz 50 Hz 60 Hz 50 Hz
Total inlet air,
m
3
/min. (cfm)
27.8 (980) 23.2 (820) 28.0 (990) 23.4 (825)
Cooling air,
m
3
/min. (cfm)
26.9 (950) 22.4 (790) 26.9 (950) 22.4 (790)
Combustion air,
m
3
/min. (cfm)
0.9 (33.4) 0.8 (28.0) 1.1 (39.2) 0.9 (32.6)
Fuel Requirements
Fuel System
Fuel types Natural Gas or LP Vapor
Fuel supply inlet 1/2 NPT
Fuel supply pressure, kPa (in. H
2
O):
Natural gas 1.2--2.7 (5-11)
LP 1.7--2.7 (7-11)
Minimum Gas Pipe Size Recommendation, in. NPT
Pipe
Length,
m (ft.)
8.5RES 12RES
Natural Gas
(132,000
Btu/hr.)
LP Vapor
(180,000
Btu/hr.)
Natural Gas
(193,000
Btu/hr.)
LP Vapor
(203,000
Btu/hr.)
8 (25) 3/4 1/2 3/4 3/4
15 (50) 3/4 3/4 1 3/4
30(100) 1111
46(150) 1 1 1 1/4 1
61(200) 1 1 1 1/4 1
Fuel Consumption at % rated load
% Load
8.5RES 12RES
60 Hz 50 Hz 60 Hz 50 Hz
Natural Gas, m
3
/hr. (cfh)
100% 3.7 (132) 3.3 (118) 5.4 (193) 4.8 (173)
75% 3.2 (113) 2.9 (101) 4.7 (163) 4.2 (148)
50% 2.6 (93) 2.3 (83) 3.5 (124) 3.1 (108)
25% 2.2 (77) 1.9 (69) 2.6 (93) 2.4 (84)
LP Vapor, m
3
/hr. (cfh)
100% 2.0 (72) 1.7 (61) 2.3 (81) 2.1 (74)
75% 1.3 (45) 1.1 (38) 2.1 (75) 1.9 (68)
50% 1.0 (36) 0.9 (31) 1.8 (60) 1.5 (53)
25% 0.8 (29) 0.7 (25) 1.2 (45) 1.1 (40)
LP Vapor, kg/hr. (lb./hr.)
100% 3.7 (8.4) 3.2 (7.1) 4.3 (9.4) 3.9 (8.6)
75% 2.4 (5.2) 2.1 (4.4) 3.9 (8.7) 3.6 (7.9)
50% 1.9 (4.2) 1.7 (3.6) 3.4 (7.0) 2.8 (6.2)
25% 1.5 (3.4) 1.3 (2.9) 2.2 (5.2) 2.1 (4.7)
LP vapor conversion factors:
8.58 ft.
3
=1lb.
0.535 m
3
=1kg
36.39 ft.
3
= 1 gal.
Nominal fuel rating:
Natural gas: 37 MJ/m
3
(1000 Btu/ft.
3
)
LP vapor: 93 MJ/m
3
(2500 Btu/ft.
3
)