Many Honda enthusiasts and mechanics often wonder about the compatibility of B16 distributors, especially when dealing with OBD2 systems. A common question arises: can you directly swap a B16 distributor onto different B-series engines, and what about the wiring when OBD2 is involved? Let’s clarify these points to provide a comprehensive understanding.
Firstly, it’s important to address the physical compatibility. All B-series distributors are designed to fit any B-series cylinder head. This is because they share the same ‘leg’ or mounting pattern. Therefore, physically bolting a B16 distributor onto another B-series engine, regardless of its origin, should not present any mechanical issues. The legs will align correctly, ensuring a proper fit onto the head.
The real challenge lies in the electrical wiring. The primary difference between various B-series distributors comes down to their electrical connectors, particularly when comparing OBD1 (On-Board Diagnostics 1) and OBD2 systems. OBD1 Honda engines, typically from 1992-1995, utilize a dual gray plug setup on the distributor. This consists of one larger gray plug with approximately six or seven wires and a smaller gray plug with two wires. In contrast, OBD2 systems, generally from 1996 onwards, consolidate these into a single, larger gray plug. Honda essentially combined the two OBD1 plugs into one for OBD2, streamlining the connections.
For those considering an OBD1 conversion on older Honda models like the EF chassis (88-91), it’s crucial to weigh the costs. Converting to OBD1 is significantly more expensive than simply sourcing a used 1988-1991 B16A distributor, which is designed for those older systems. An OBD1 conversion typically necessitates several components from a 1992-1995 B-series engine, including:
- OBD1 injectors
- OBD1 distributor
- OBD1 ECU (Engine Control Unit)
- OBD1 engine harness
These parts can accumulate significant costs, especially when factoring in used component prices and potential labor. Therefore, unless budget is not a concern, opting for a direct replacement 1989-1991 B16A distributor is often the more practical and economical solution for older Hondas. This approach avoids the complexities and expenses associated with a full OBD1 conversion, addressing the distributor issue directly and efficiently.
