Cadillac Sixteen

The Cadillac Sixteen was a prototype of a stylish and high performance automobile first presented by Cadillac in 2003.

The vehicle was equipped with a 32-valve V16 concept engine displacing 13.6 liters (~830 cu. in) and was mated to a four-speed electronically controlled automatic transmission. The engine featured fuel-saving Active Fuel Management technology, much improved from its notorious ancestor, debuting in 2004 on some 2005 GM models. On the Sixteen, it would seamlessly shut down twelve cylinders in light driving, eight during strenuous driving, and only awaken the entire engine under full acceleration. With this ingenious system, the engine was capable of 20 mpg Imperial under normal conditions. The engine was said to produce 1,000 horsepower (750 kW) using no form of forced induction.