King XP Performance Rod Bearing Set (0.50mm Undersize) - NA/NB Miata (90-05)

King XP series connecting rod bearing set in the 0.5 mm undersize (King CR4002XP0.5) for the 1.6L and 1.8L engines in the 1990-1997 Mazda Miata (NA) and 1999-2005 Miata (NB). The undersize shells are for a crankshaft whose rod journals have been reground 0.5 mm below standard; a crankshaft still at standard size takes the Standard set. The set holds four pairs of shells, one pair for each connecting rod.

• King XP series race bearing: a tri-metal, copper-based material with King's pMaxBlack overlay, which King credits with higher load capacity
• King lists the XP series for most race applications, including circle track, drag racing and off-shore, and other applications that use steel crankshafts
• Size: 0.5 mm undersize, for rod journals reground 0.5 mm below standard. Have the machinist confirm the finished journal size before ordering
• Set contents: 4 pairs (8 shells), one upper and one lower shell for each of the four connecting rods
• Dimensions King publishes for this family (standard size): rod journal 44.94-44.96 mm, rod housing bore 48.00-48.02 mm, shell length 17.0 mm, wall thickness 1.509 mm. King does not publish separate dimensions for each size
• King's size options for CR4002XP: Standard, STDX, 0.25mm, .026mm and 0.5mm. Measure the journals and oil clearance before choosing a size; King's catalog does not give a target clearance for this set

Fitment: Connecting rod bearings, all four rods. 1990-1997 Mazda Miata (NA, 1.6L and 1.8L) and 1999-2005 Mazda Miata (NB, 1.8L). King's catalog lists this bearing for the Mazda Miata 1.8L (1994-1997 and 1999-2005) and for the Mazda MX-5 1.6L (1989-1994) and 1.8L (1993-2005); the table shows those listings as US model years. King publishes the vehicle list for the CR4002XP family, and this part number is the 0.5 mm size option of that family. King does not list it for the 2006-on MX-5.

Part number: King CR4002XP0.5

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