According to tuners that we’ve spoken to, even engines with fairly big cams will idle at 13.0:1 air/fuel ratio and might be able to handle as lean as 14:1 air/fuel ratio at part-throttle. Much of this ...

Wideband O2 sensors play a pivotal role in the realm of automotive tuning, providing precise measurements of the air-fuel ...

Creativity flows from the smallest of automakers: The SkyActiv-X engine compresses gasoline until it self-combusts. It uses ultra-lean air/fuel mixtures, low enough to sometimes need a spark plug to ...

Homogeneous charge compression ignition (HCCI) engines combine a diesel's torque and fuel efficiency with a gas engine's cleaner emissions. The HCCI technique has been a goal of automakers since the ...

Meeting future exhaust emission and fuel consumption standards for passenger cars will require refinements in how the combustion process is carried out in spark ignition engines. A direct injection ...