BN2
The BN2 was fitted with a real 4-speed manual transmission, still with overdrive on the top 2 gears. Other features that distinguish the BN2 from the BN1 are the slightly larger front wheel arches, different rear axle and being the first 100 with optional two-tone paint. The colour alternatives available to the 100 were: Reno Red, Spruce Green, Healey Blue, Florida Green, Old English White, Black, and approximately 50 Gunmetal Grey cars. The BN2 two-tone colours were: White/Black; Reno Red/Black; Healey Blue/White; Black/Reno Red; and Florida Green/White.
In 1955, a 100M model was developed as well, with larger carburettors, a cold air box to increase air flow to the carburettors, high-lift camshaft and 8.1:1 compression pistons. It produced 110 bhp (82 kW) at 4500 rpm. The front suspension was stiffened and the bonnet gained louvres, along with a bonnet belt. Most (approximately 70%) of the cars were finished with a two-tone paint scheme including two cars finished in unique colour schemes: one White over Red and the other (for display at the 1955 London Motor Show) in Black over Pink. There were 640 factory built 100Ms—all BN2 series cars. The 100M components (except for the high compression pistons) were also available as the Le Mans Engine Modification Kit which could be installed in either a BN1 or BN2 with the engine in situ, improving the power output to approximately 100 bhp (75 kW) at 4500 rpm. The Le Mans kit and its component parts could be ordered from BMC, so cars were modified by Austin dealers and private owners.
The final BN2 was built in July 1956 with a total of 4604 BN2s produced, including the 100M.
Read more about this topic: Austin-Healey 100