Koenigsegg TFG

The Koenigsegg TFG is an Inline-3 engine. The TFG stands for "Tiny Friendly Giant." It is a Freevalve (Camless piston engine), thus it does not have a camshaft. Instead it uses pneumatic actuators that allows it to open each valve independently. This is includes the 2 exhaust valves working independently of each other, in a single cylinder. The Variable displacement system allows fuel economy to be 15%-20% higher than a variable camshaft engine. Cold start emissions are also drastically reduced by 60% over a variable camshaft engine. The engine is an equipped with a small turbo for one set of exhaust valves, and a larger turbo for the other set of exhaust valves.[2] This also makes for a common misconception that it is a Twin-turbo, when it is neither that or a Sequential or a Staged system. Without the turbos the Koenigsegg claims the engine is only capable of 300 hp (220 kW) The engine can operate on the Otto cycle, Miller cycle or the Atkinson cycle.[3] Further advantages of the camless engine is that a Throttle body is no longer required because of the precision of the valve timing. According to Koenigsegg CEO, Christian von Koenigsegg, when running on Gen 2.0 ethanol, the TFG becomes "at least as CO2-neutral as an EV running on renewable electric sources such as solar or wind."[4] The TFG follows previous Koenigsegg engines in its ability to run on all major fuels, from E85 to standard gas.