VivaLaMigra
Seaman Apprentice
- Joined
- Oct 21, 2016
- Messages
- 45
Why High & Low Stator Windings on Mercury Ignitions - Related to Bias Circuit? How?
OK, first off, why does the Mercury stator have high and low AC outputs for the CDI pack, when OMC can get along just fine with one output? Ultimately the capacitor has to be charged from a single source, right? So, why two outputs, and why two voltages? I read on another thread that the bias circuit somehow controls timing and compensates for the trigger voltage increasing at progressively higher RPM which would result in advancing the timing since the 0.6V threshold for the switching transistor would be occur earlier. OK, why doesn't THAT happen on "Johnrudes?" And, on an L6 or V6, you have two packs linked together via the bias terminal. On a 3-cylinder, one TRIGGER wire is connected to the bias terminal. Is there a bias terminal at all on a 4-cylinder pack?
I'm just a bit in the dark here about this whole 'bias' deal and especially about the two stator voltages which is a feature of the 3, 4, and 6 cylinder motors. Anyone out there who can put this in terms that a relatively intelligent person, without an EE degree, can grasp? Thanks.
OK, first off, why does the Mercury stator have high and low AC outputs for the CDI pack, when OMC can get along just fine with one output? Ultimately the capacitor has to be charged from a single source, right? So, why two outputs, and why two voltages? I read on another thread that the bias circuit somehow controls timing and compensates for the trigger voltage increasing at progressively higher RPM which would result in advancing the timing since the 0.6V threshold for the switching transistor would be occur earlier. OK, why doesn't THAT happen on "Johnrudes?" And, on an L6 or V6, you have two packs linked together via the bias terminal. On a 3-cylinder, one TRIGGER wire is connected to the bias terminal. Is there a bias terminal at all on a 4-cylinder pack?
I'm just a bit in the dark here about this whole 'bias' deal and especially about the two stator voltages which is a feature of the 3, 4, and 6 cylinder motors. Anyone out there who can put this in terms that a relatively intelligent person, without an EE degree, can grasp? Thanks.