mark.bitterlich(at)navy.m
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 Posted: Tue Jun 02, 2015 12:20 pm Post subject: Engine roughness, as in stops. starts. stops. starts. |
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Walt > I have been trying to get my head around this theory of a "massive discharge" etc. but have been too busy of late to sit down and think it
through. So far it just doesn't compute.
I concur. There is no failure mode that can occur that would increase the intensity of the firing pulse above what it was designed to provide.
Walt > I have had only one coil failure in forty years of playing with radial engines. That was in a Harvard with Bosch mags. That mag simply quit
working, not intermittent, no bangs or whatever just simply and permanently dead.
The interesting thing about the original Russian coil designs is that the condenser is actually integral and internal to the coil itself. Rather unusual. Since coils get hot, this also means the trapped heat is applied to the condenser as well. The common discussion theme regarding the topic under discussion (which is: Engine roughness, as in stops. starts. stops. starts.) is that it is related to "engine heat". Actually, I believe that is not quite accurate. I personally believe the problem is related to HEAT IN THE COIL, which is not necessarily synonymous with engine heat. In addition, since the coil assembly is internal to the mag, there is no easy way to get rid of that heat and it becomes cumulative.
If that premise is accurate, then emphasis might be placed on what external factors increase heat in the coil since regardless of whether we are talking coil windings, or condenser malfunction, heat is the enemy. Kind of an "AHA" moment. Things such as spark plug gap, what spark plug wires are used, point dwell (!!), etc., all would impact coil heat.
Best to you Walt,
Mark
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