Kohler 8.5/12RES warranty Application Data, Operation Requirements, Engine Electrical, Exhaust

	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