StitchB wrote on Jan 10
th, 2015 at 5:43am:
Ignition from coil looks like a screw rather than a wave jumping up from ground, strange.
I find allot of the bike systems i come across look a little like what you are describing. Mostly on the carbeurated bikes with a CDI type ignition system.
StitchB wrote on Jan 10
th, 2015 at 5:43am:
Hooked my Pico up to My KLR 650 and was surprised to see that the coil is AC 120 volt as that side of the alternator is not converted through diodes down to DC and would never have caught it except it was not 12 volt supply but 120 AV.
I believe this is probably a CDI type of system where by the coil is excited by a large & short release of voltage from the capacitior in the CDI ignitor unit. Rapidly creating a field in the primary windings.
Rather than the typical Transistorised type Ignition controll where by 12v is constant to the coil and the computer rapidly switches to ground to collapse the magnetic field.
I have found that on most bikes around a 200 peak voltage signal is normal minimum at idle going up to over 400v on some.
As for balancing with O2 sensors i would assume you could get a good result form testing this way. my only concern would be that alot of bikes have a cold air bleed into the exhaust for emmision controll in the exhaust port (which is a mechaincal type valve that opens) so you may well end up balancign to compensate for tollerances in that system also which shouldnt play a part in the combustion process.
But other than the issues of mounting the sensors i cant see why you couldnt get as good or arguably a better result this way. It would be good to try this and run it against a Map waveform and see if there is any noticable difference in the accuracy.
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