MX-5 Miata L4-2.0L (2008)
Valve: Specifications
Valve Specifications
Valve head margin thickness
Minimum
IN: ............................................................................................................................................................................................... 1.62 mm (0.0637 in)
EX: .............................................................................................................................................................................................. 1.82 mm (0.0716 in)
Valve length
Standard
IN: ...................................................................................................................................................................... 102.99--103.79 mm (4.055-4.086 in)
EX: ...................................................................................................................................................................... 104.25-105.05 mm (4.105-4.135 in)
Minimum
IN: ............................................................................................................................................................................................. 102.99 mm (4.055 in)
EX: ............................................................................................................................................................................................ 104.25 mm (4.104 in)
Valve stem diameter
Standard
IN: ....................................................................................................................................................................... 5.470-5.485 mm (0.2154-0.2159 in)
EX: ..................................................................................................................................................................... 5.465-5.480 mm (O.2152-0.2157 in)
Minimum
IN: ............................................................................................................................................................................................. 5.440 mm (0.2142 in)
EX: ............................................................................................................................................................................................ 5.435 mm (0.2140 in)
Valve guide inner diameter
Standard .............................................................................................................................................................. 5.509-5.539 mm (0.2169-0.2180 in)
Valve stem to guide clearance
Standard
IN: ...................................................................................................................................................................... 0.024-0.069 mm (O.0009-0.0027 in)
EX: ...................................................................................................................................................................... 0.029-0.074 mm (0.0012-0.0029 in)
Maximum ...................................................................................................................................................................................... 0.10 mm (0.004 in)
Valve guide protrusion height
Standard ...................................................................................................................................................................... 12.2-12.8 mm (0.481-0.503 in)
Valve seat contact width
Standard .......................................................................................................................................................................... 1.2-1.6 mm (0.048-0.062 in)
Valve protrusion height
Standard
IN: .......................................................................................................................................................................... 40.64-42.24 mm (1.6O0-1.662 in)
EX: .......................................................................................................................................................................... 40.50-42.10 mm (1.595-1.657 in)
Valve spring pressing force ............................................................................................................................................... 390 Nm (39.76 kgf, 87.67Ibf)
Valve spring standard height .......................................................................................................................................................... 28.68 mm (1.129 in)
Valve spring out-of-square
Maximum .................................................................................................................................................................................... 1.95 mm (0.0767 in)