B18C and B18C5 Valve and Valve Spring specs VTEC

Acura Integra GSR B18C 1994-2001 and Type R B18C5 VTEC

• Intake Valves
  • Face Angle: 45°
  • Head Diameter: 1.295-1.303" (32.89-33.09 mm)
  • Margin
    • B18C1 Engine
      • Standard: 0.041-0.053" (1.04-1.35 mm)
      • Minimum Margin: 0.033" (0.84 mm)
    • B18C5 Engine
      • Standard: 0.024-0.035" (0.61-0.89 mm)
      • Minimum Margin: 0.016" (0.40 mm)
  • Stem Diameter
    • Standard: 0.2156-0.2159" (5.476-5.484 mm)
    • Service Limit: 0.2144" (5.445 mm)
• Exhaust Valves
  • Face Angle: 45°
  • Head Diameter: 1.098-1.106" (27.89-28.09 mm)
  • Margin
    • Standard: 0.065-0.077" (1.65-1.95 mm)
    • Minimum Margin: 0.057" (1.45 mm)
  • Stem Diameter
    • Standard: 0.2146-0.2150" (5.450-5.461 mm)
    • Service Limit: 0.2134" (5.420 mm)
• Valve Springs Free Length
  • Intake (B18C1 Engine)
    • Outer: 1.616" (41.05 mm)
    • Inner:
      • NIHON HATSUJO manufactured valve spring: 1.424" (36.17 mm)
      • CHUO HATSUJO manufactured valve spring: 1.425" (36.19 mm)
  • Intake (B18C5 Engine)
    • Outer: 1.700" (43.18 mm)
    • Inner: 1.450" (36.83 mm)
  • Exhaust (B18C1 Engine)
    • NIHON HATSUJO manufactured valve spring: 1.652" (41.96 mm)
    • CHUO HATSUJO manufactured valve spring: 1.651" (41.94 mm)
  • Exhaust (B18C5 Engine)
    • Outer: 1.616" (41.04 mm)
    • Inner: 1.424" (36.17 mm)

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VALVE STEM INSTALLED HEIGHT (MM)

Measure from base of valve guide to tip of valvestem.

• Intake
  • Standard 1.4750-1.4935 (37.465-37.935)
  • Service Limit 1.5033 (38.184)
• Exhaust
  • Standard 1.4632-1.4817 (37.165-37.635)
  • Service Limit 1.4915 (37.884)

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Acura Integra 1994-2001 DC2 DOC VTEC

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