Your vehicle is designed to use "Regular" unleaded with pump (R+M)/2 octane rating of 87.
We do not recommend the use of gasolines labeled as "Regular" that are sold with octane ratings of 86 or lower in high altitude areas.
Costco’s two fuels are 85 and 91 octane.
Have never heard any pinging, but I also accelerate gently.
On emergentransports I have done full throttle on mountain upgrades to just maintain the speed limit, but at 65 to 75 mph wind noise can cover pinging.
Costco's two fuels are 85 and 91 octane.
Have never heard any pinging, but I also accelerate gently.
The reason you may not be hearing any pinging is because the anti-knock sensor is working and detecting pinging then backs off the timing. Gas mileage and acceleration can be adversely effected.
Thank you.
Video fails to explain what it detects. "The frequency of the vibration caused by knocking (pinking) is about 15 kHz."
Now that is good!
Thank you.
Think there was a puzzler once about a mysterious car or engine problem ,had something to do with performance ,anyway it was traced back finally to something or the other that was loose ,when it "knocked " it activated the knock sensor and changed the engine performance .
It’s a microphone.
It could theoretically be used to detect other problems like rod knock vs piston slap etc.
Anyone here ever look at its output on a scope?
^ Yes. If one can identify the waveforms of various problems or potential problems and a transducer can detect the waveforms, the computer can recognize and notify.
Lucky that (an engine’s) pinging is within a narrow-enough frequency range that it can be readily identified.
Is the pinging a lower frequency the larger the cylinder?
Another method of detecting detonation is by measuring the voltage needed to ionize the air in the spark plug spark gap. The higher the cylinder pressure, the higher the voltage has to be to jump a spark, in case you ever wondered why engines with weak ignition systems or worn spark plugs misfire at full throttle but work fine at part throttle.
After the main spark, a string of follow up sparks happens not only to insure ignition but also the voltage needed to ionize the air indicates the pressure rise in the cylinder. A sudden precipitous rise in pressure indicates detonation. Misfires can also be detected by the absence of a pressure rise after the main spark.
I believe Harley Davidson used this system on some of its models. If you put the wrong spark plugs or plug wires on these models, you would get a “check engine” light.
I must be way behind the times, I didn't know Harley's even have a CEL. I guess I need to learn to keep up.
Harleys have to be EPA compliant just like Hondas. Even though HD has been stereotyped as resisting new technology at all costs, in reality, they were one of the earliest adapters of EFI in motorcycles, offering mostly EFI bikes back when Honda, Yamaha, Kawasaki, and Suzuki’s all mostly still had carbs.
They weren’t the very first, but they were leaders in offering EFI in the majority of their lineup.