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 A camshaft is a shaft that contains a row of pointed cams, in order to convert rotational motion to reciprocating motion. Camshafts are used in piston engines (to operate the intake and exhaust valves), mechanically controlled ignition systems ...

. Instead it uses

pneumatic actuator A pneumatic control valve actuator converts energy (typically in the form of compressed air) into mechanical motion. The motion can be rotary or linear, depending on the type of actuator. Principle of operation A Pneumatic actuator mainly co ...

s that allows it to open each valve (both intake and exhaust) independently to maximise performance and minimise fuel consumption depending on driving conditions. The

pneumatic actuators A pneumatic control valve actuator converts energy (typically in the form of compressed air) into mechanical motion. The motion can be rotary or linear, depending on the type of actuator. Principle of operation A Pneumatic actuator mainly co ...

also have the ability to switch the engine between 2-stroke cycles and 4-stroke cycles by controlling the number of power strokes in relation to the number of idle strokes. The patent for this system was bought by Koenigsegg's sister company Cargine Engineering in 2002. The

Variable displacement Variable displacement is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi-cylinder engines. Many automobil ...

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 equipped with a small turbo for one set of exhaust valves, and a larger turbo for the other set of exhaust valves. However this

Twin-turbo Twin-turbo (not to be confused with a twincharger setup, which is a combination of a supercharger and a turbocharger) refers to an engine in which two turbochargers work in tandem to compress the intake fuel/air mixture (or intake air, in the case ...

is neither a

Sequential In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed and order matters. Like a set, it contains members (also called ''elements'', or ''terms''). The number of elements (possibly infinite) is called th ...

nor a Staged system. Without the turbos Koenigsegg claims the engine is only capable of . The engine can operate on the

Otto cycle An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. It is the thermodynamic cycle most commonly found in automobile engines. The Otto cycle is a description of what happ ...

Miller cycle In engineering, the Miller cycle is a thermodynamic cycle used in a type of internal combustion engine. The Miller cycle was patented by Ralph Miller, an American engineer, dated Dec 24, 1957. The engine may be two- or four-stroke and may be r ...

or the

Atkinson cycle The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power density. A variation of this approach is used in some modern aut ...

. Further advantages of the camless engine is that a

Throttle body A throttle is the mechanism by which fluid flow is managed by constriction or obstruction. An engine's power can be increased or decreased by the restriction of inlet gases (by the use of a throttle), but usually decreased. The term ''throttle'' ...

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." The TFG follows previous Koenigsegg engines in its ability to run on all major fuels, from E100 to standard gas.

References

Straight-three engines Koenigsegg vehicles {{automotive-part-stub