Application Data

Engine

Operation Requirements

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 material

Heat Treated, Ductile Iron

Governor: type

Electronic

Frequency regulation, no load to full load

Isochronous

Frequency regulation, steady state

±0.5%

Air cleaner 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, m3/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

 

 

8.5RES

 

 

12RES

 

Cooling Air

60 Hz

50 Hz

60 Hz

50 Hz

Total inlet air,

 

 

 

 

 

 

 

 

m3/min. (cfm)

27.8

(980)

23.2

(820)

28.0

(990)

23.4

(825)

Cooling air,

 

 

 

 

 

 

 

 

m3/min. (cfm)

26.9

(950)

22.4

(790)

26.9

(950)

22.4

(790)

Combustion air,

 

 

 

 

 

 

 

 

m3/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. H2O):

 

 

 

 

 

Natural gas

 

 

 

1.2--2.7 (5-11)

 

LP

 

 

 

 

 

1.7--2.7 (7-11)

 

 

 

 

Minimum Gas Pipe Size Recommendation, in. NPT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8.5RES

 

 

12RES

 

 

 

 

 

 

 

Pipe

Natural Gas

LP Vapor

Natural Gas

LP Vapor

Length,

(132,000

(180,000

(193,000

(203,000

m (ft.)

Btu/hr.)

Btu/hr.)

Btu/hr.)

Btu/hr.)

 

 

 

 

 

 

 

 

 

 

 

8

(25)

 

 

3/4

 

1/2

 

3/4

 

3/4

15

(50)

 

 

3/4

 

3/4

 

1

 

3/4

30(100)

 

 

1

 

1

 

1

 

1

46(150)

 

 

1

 

1

1 1/4

 

1

61(200)

 

 

1

 

1

1 1/4

 

1

 

 

 

 

 

Fuel Consumption at % rated load

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8.5RES

 

 

12RES

 

 

 

 

 

 

 

% Load

60 Hz

50 Hz

60 Hz

50 Hz

Natural Gas, m3/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, m3/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:

8.58ft.3 = 1 lb. 0.535 m3 = 1 kg

36.39ft.3 = 1 gal.

Nominal fuel rating:

37 MJ/m3 (1000 Btu/ft.3)

Natural gas:

LP vapor:

93 MJ/m3 (2500 Btu/ft.3)

Type

Full Pressure

Oil capacity (with filter), L (qt.)

1.9 (2.0)

Oil filter: quantity, type

1, Cartridge

Oil cooler

Integral

G4-97 (8.5/12RES) 4/14n

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Kohler 8.5/12RES warranty Application Data

8.5/12RES specifications

The Kohler 8.5/12RES is a highly efficient standby generator designed for residential use. Power outages can be disruptive and inconvenient, making a reliable backup power solution essential for homeowners. Kohler has a long-standing reputation in the power generation industry, and this generator exemplifies their commitment to quality, reliability, and innovative technology.

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