For Honda enthusiasts working with B-series engines, distributor compatibility often comes into question, especially when dealing with OBD1 and OBD2 systems. A common query revolves around using a B16 distributor with an OBD2 setup. Let’s clarify the situation and address the key considerations for B16 distributor swaps in OBD2 applications.
One frequent point of discussion is whether modifications are needed to physically fit different B-series distributors. The good news is that no physical modifications to the distributor legs are necessary for mounting a DOHC VTEC distributor, like those from a Del Sol, onto older 88-91 motors. All B-series distributors share the same mounting pattern and will bolt onto any B-series head.
The real challenge and primary difference lie in the electrical wiring. OBD1 (typically 92-95 Honda models) distributors utilize a dual gray plug configuration – one larger plug with multiple wires and a smaller plug with two wires. In contrast, OBD2 distributors (96+ models, such as the 99 Si) feature a single, larger gray plug that consolidates all the wiring connections. Honda simplified the system in OBD2 by integrating the functions of the two OBD1 plugs into one.
Therefore, when considering a B16 distributor for an OBD2 system or vice versa, the focus should be on the wiring, not physical fitment. Swapping distributors between OBD1 and OBD2 systems necessitates rewiring or repinning the distributor plugs to match the engine harness of your vehicle.
For those contemplating an OBD1 conversion on an EF chassis (88-91 Civic/CRX), it’s crucial to consider the cost implications. While technically feasible, converting to OBD1 is significantly more expensive than sourcing a used 89-91 B16A distributor that is natively compatible with the older wiring system. An OBD1 conversion involves acquiring several components, including:
- OBD1 injectors
- OBD1 distributor
- OBD1 ECU (Engine Control Unit)
- OBD1 engine harness
These parts, even used, can accumulate a substantial cost. Opting for a direct replacement 89-91 B16A distributor is often the more practical and budget-friendly solution for those with older B-series engines.
In conclusion, while all B-series distributors are physically interchangeable across B-series heads, the critical distinction between OBD1 and OBD2 distributors lies in their wiring configurations. Successfully using a B16 distributor from a different OBD generation requires addressing these wiring differences through rewiring or repinning. For many users, especially those seeking cost-effective solutions, finding the correct distributor for their specific OBD system is the most straightforward approach.
