PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
Technician wrote:I managed to find a bit of spare time this evening to have another look at this correlation, timing and fueling. As you rightly pointed out I was thinking that TDC is where the missing teeth are on the flywheel, how wrong I was. How have I got a better understanding of what is happening in the cylinder, well ideally a minimum 5 channel scope would be advantageous when doing this type of research, but I did not use my 8 channel scope this time but will try it when I get a minute.
Using the Pico 4 channel I did another comparison using channel A for the crankshaft, channel B for the camshaft, and channel C for the WPS500x transducer. Interesting results, where I thought the ignition was firing after TDC previously, based on the previous scope trace, it is actually firing before TDC, and using the ruler, 17 crankshaft teeth before TDC can be measured. Because I wanted all scope traces to show cylinder 1 events, it is impossible to scope the ignition of cylinder 1 while using the WPS transducer, but I could have scoped the injection event but forgot it. It seems then that analyzing cam and crank correlation is not as straight forward as I initially thought, but with the transducer it becomes more clear where the events are taking place. I think there is much to learn.