GM new LF3

The title for most people doesn't mean anything, but if you are working for General Motors (more specifically, Cadillac) you probably are very proud of this. LF3 is the internal code name for the new engine that will make its debut with the 2014 Cadillac CTS.

LF3 Twin-Turbo V6

Why is it so important? Because it is one of the most technologically advanced engines ever produced by GM. This mill will indeed power the Cadillac CTS, and to do that it needs to have good power as well as good fuel economy. Cadillac engineers nailed them both. 

Front view of the engine

The LF3 is a twin turbo six cylinder (in V position) and a displacement of 3.6L. It produces 420 horses and 430 foot pound of torque. For those not familiar with the numbers, this engine will be more powerful and more torque-y than the previous generation C6 Corvette with the 5.3L v8. It allows the big CTS sedan to go from 0-60 mph in 4.6 sec. Impressive numbers.

Top view of the LF3

Impressive also is the expected fuel economy of this engine on the Caddilac CTS. According to GM, it will do 17 mpg city and 25 mpg highway. Note that the car is a 3800lb vehicle. Not a lightweight. 
The numbers will confirmed by the EPA officially later this year.

Front view of the LF3

The magic of the fuel economy numbers is (mostly) due to their new transmission that the engine is mated: a eight speed automatic. This allows the engine to rev low when cruising and have enough power when needed.

Eight speed automatic