Reply To: Evinrude SportFour Ignition Questions

[hank1995]

Nice job on the little video. Thanks. I like the idea of the ignition modules – I have a hard time picturing the spindly original points opening and closing consistently at 4K RPM – but of course they did and do. What about placement of the modules? The points open when the inner arm is contacted by the lobe or cam. The magnet in the flywheel has gone by or is going by (?) creating a magnetic field (inducing) in the primary windings – then collapses when the points open. On an OMC or Mercury ignition from the 50’s, the mag plate is rotated to retard and advance the spark and control the throttle. But it’s not timed to a specific point – say a few degrees BTDC like on older car. Presumably full advance is somewhere in the 30 BTDC range and full retard is 2-3 BTDC but that’s all been engineered/manufactured in. Just thinking this thru.