Worth reflecting on, given that the BRM V16 was produced in 1951.
The BRM V16 was:
1500cc (to meet World Championship regs of 1.5 litre supercharged or 4.5 litres naturally aspriated)
V16 - because it is the only truly naturally, perfectly balanced engine layout
Two-stage centrifugal Rolls Royce supercharger (a la Merlin engine) running at 5.7 bar (82psi and about 2 bar higher than the F1 turbo days of the 80s in qualifying trim....)
12,000rpm
550-600bhp
No wonder it wasn't the most reliable of beasts, but what a beast....
http://uk.youtube.com/watch?v=fZMPDCNyQxERoad cars saw Marmon, Cadillac and Peerless producing true V16s in the 1930s/40s, racing saw the famed battles between the Mercedes and Auto Unions from 1933-38, with the latter's C Type running a 6.1 litre, rear-engined, normally aspirated V16. And BRM didn't stop there at being complicated, producing their 3-litre H-16 in 1966 (two boxer/flat 8s with separate crankshafts geared to a common output)....
Or you could go for the ultimate H-layout, 24 cylinder, 36.7 litre Napier Sabre (2 flat-12s, one above the other with geared crankshafts driving a common output shaft) which powered the Hawker Tempest V...
http://uk.youtube.com/watch?v=BKq51LdJ-ZUMG Mark