Valve Guides

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Product Description

VALVE STEM DIA (mm)	INTAKE (m)	EXHAUST (m)
6-7	10-40	25-55
8-9	20-50	35-65
10-12	40-70	55-85

Size Range

SPECIFICATION	FROM	TO
Bore (mm)	4.0	20.0
Outer Diameter (mm)	8.0	30.0
Length (mm)	25.0	200.0

CHEMICAL COMPOSITION

ELEMENT	CAST IRON GG25	SINTERED METAL	BRASS CuZn40Al2 CuZn37Mn3Al2PbSi DIN 17660 2.0550
Carbon (%)	3.00-3.40	1.50-3.00	56.50-59.00
Silicon (%)	1.80-2.50	0.40 MAX	0.30-1.00
Manganese (%)	0.60-0.80	1.20 MAX	BAL
Sulphur (%)	0.00-0.12	0.60 MAX	1.30-2.30
Phosphorus (%)	Min 0.35	0.80 MAX	1.40-2.60
Chromium (%)	-	-	2.00 MAX
Molybdenum (%)	-	-	-
Nickel (%)	-	-	-
Vanadium (%)	-	-	-
Copper (%)	-	4.00-10.00	56.50-59.00
Magnesium (%)	-	0.50 MAX	-
Tin (%)	-	0.80 MAX	-
Aluminum (%)	-	-	1.30-2.30
Lead (%)	-	-	0.80 MAX
Zinc (%)	-	-	BAL
HARDNESS (BHN)	190-250	120-200	150-170
THERMAL CONDUCTIVITY (W/mK)	38-45	21-48	46-100
COEFFICIENT OF THERMAL CONDUCTIVITY (10-6 K)	9-11	9-13	18-22

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