The production automobile started life with relatively small
engines, but as luxury cars emerged in the 1920s, carmakers began
developing larger V-8 and V-12 engines. Some companies even went as
far as to develop massive V-16s.
Although these engines delivered lower vibration, thus
increasing comfort inside the cabin, they typically produced as
much power as a V-8 or V-12 engine, while being notably more
expensive to produce. As a result they were rarely used in
automobiles. Let’s have a closer look at the short but intriguing
history of V-16 (and W-16 for that matter) cars below.
Source: FS – Cars 1
The Short and Intriguing History of V-16 and W-16