So far, the switchover from spark ignition to compression ignition is the only issue needing attention outside of final, production-ready engine calibration. The process is seamless, with zero vibrational cues that the X has chosen an ignition type and fully committed to it. However, it is audible, thanks to copious knock (detonation) that hangs around any time the engine isn’t fully in a single ignition setting. During clean transitions from spark to compression ignition or back, the X emits its stuttered knocking soundtrack for about a second or two. However, whenever the computers move close to one ignition state from the other, the knocking drags on. This condition, in which fuel mixtures aren’t quite set for the desired state of ignition, occurred whenever the engine was spinning at low rpm—a CI-favorable condition—but loads were moderate, favoring spark ignition.
from Car and Driver BlogCar and Driver Blog http://ift.tt/2h570Or
via IFTTT
0 comments:
Post a Comment