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CP Acura B18A1 and B18B1 Forged Pistons

CP Acura B18A1 / B1 Pistons

Forged CP Pistons for the Acura B18A1 and B18B1 engines are compatible with oversized intake and exhaust valves and high lift camshafts. CP Carrillo products represent the highest quality and are engineered for maximum power. Pistons can be ordered with optional gas ports, skirt coating, ceramic top coating, and stronger wrist pins if desired. To order a set with any of these options, please include a message in the note section of the order form during our check out process, or you may contact us in advance for more info on these options.

CP Standard features include:

  • Deep valve reliefs accommodate high lift camshafts
  • Larger valve reliefs for +1mm valve sizes
  • Custom skirt cam and barrel design
  • Accumulator grooves
  • High strength aluminum forgings
  • High performance rings included
  • Fully CNC machined and balanced to +/- 1 gram
  • Wrist pins included at no additional cost
  • Double pin oilers force fed from oil ring groove
  • Pick lock grooves for easy lock removal
  • Pin fitting included


CP Pistons Acura B18A1 and B18B1 Turbo and High Compression Pistons

Forged CP Acura B18A1 and B18B1 Pistons

  • Bore Size Cylinder bore size piston is designed to work in, listed in inches and millimeters
  • Relative Size Denotes whether this bore size is stock standard size, or an oversize listed in millimeters
  • CR Compression Ratio
  • Crankshaft Stroke Designed to work with stock crank stroke of 89mm
  • Connecting Rod Length Designed to work with stock rod length of 137mm
  • Wrist Pin Diameter 21mm
  • Compression Height 1.181 inches This is the distance from the centerline of the wrist pin bore to the top flat surface of the piston.
  • Ring Widths Ring grooves are machined to work with 1.0mm, 1.2mm, 2.8mm rings
  • WHAT’S INCLUDED 4 forged pistons, 4 Wrist Pins, pin retention locks and premium piston ring set


Compression Piston Set
3.189 81 STD 89 137 9 SC7005

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3.209 81.5 +0.5mm 89 137 9 SC7006

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3.189 81 STD 89 137 10.5 SC7105

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3.209 81.5 +0.5mm 89 137 10.5 SC7106

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More general and technical information about CP Carrillo and our complete listing of all available CP products is here > CP Pistons Catalog


Custom B18A1 and B18B1 Engine Pistons

If you do not see a shelf stocking part number set here with the specifications that you need, we can provide you with a set of custom pistons built to your exact requirements. Please contact us if you would like to discuss a set of CP customs and we will be happy to work with you to insure you get exactly the high performance forged Acura pistons you need.




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