BRM P48 - Formula 1 race car , seen in action during the. P48 (SEE PHOTO!). was a quick reaction to this, using major components from the P25 but in rear-engined format. The P48 was revised for the 1.5l rules in 1961, but once again BRM's own engine was not ready and the cars had to run with a Coventry-Climax four cylinder unit in adapted P48 chassis.