2021-01-01 - B18A1 interchange with B18B1
We have a 1992 Acura Integra build with the B18A1 engine. However the A1 is increasingly difficult to find. I picked up a running B18B1 from a 1994 Integra (same VPI as 1992) which is the same engine as the A1 for use as a spare.
Would we be charged with 50pts swap by using the B1 if we had an engine failure? I want to be certain so I either sell the B1 or insure we stay at least under 450 pts total in case we would have to install the back up.
We would consider the use of the B18B1 engine to be a replacement for the B18A1 engine in your Integra. No points for the change.
The B18A1 was in the 1990-1993 base model integras.
In 1992, OBD0 ECUs were changed to OBD1. The HP bump was 10hp from the major change in ECU.
In 1994 the 3rd gen Integra was released and the base model motor was b18B1 at 142 hp. The 2 hp was most likely ECU tuning.
The engines have the same bore / stroke / compression ratio.
Everything is identical unless the cam profile which is not advertised is different, but there is only a 2 hp difference.