This ACL High Performance main bearing set is machined 0.25mm oversize, for a crankshaft main journal reground 0.25mm over standard on the Acura B17A1/B18A1/B18B1/B18C1/B18C5 VTEC and Honda K20A3/K20A2/K24A engine family. Per ACL's own fitment data this bearing size is shared across the Acura Integra, RDX, RSX, and TSX, and the Honda Accord, Civic Si, CR-V, and Element.
Specifications:
- Type: Main Bearing Set
- Series: High Performance
- Size: 0.25mm Oversize
- Engine Fitment: Acura B17A1/B18A1/B18B1/B18C1/B18C5 VTEC / Honda K20A3/K20A2/K24A
- Part Number: 5M1959H-.25
FAQ
What does "0.25mm Oversized" mean?
It means the bearing is machined 0.25mm over standard thickness, for use with a crankshaft main journal that has been reground 0.25mm undersize.
What engines does this main bearing set fit?
It's sized for the Acura B-series (B17A1, B18A1, B18B1, B18C1, B18C5 VTEC) and Honda/Acura K-series (K20A3, K20A2, K24A) engine family, as used in the Acura Integra, RDX, RSX, TSX and Honda Accord, Civic Si, CR-V, and Element.
Do I need rod bearings too?
Yes, this listing is for main bearings only. Rod bearings for this engine family are sold separately.
How do I know if I need the 0.25mm oversize instead of Standard?
Your engine builder or machine shop will specify the size based on how much material was removed when the crankshaft was reground. Standard size is for a stock, unmachined crank.
