Voltage spikes on an oscilliscope certainly do go up under load. One of the tests with the old Sun Tester was the snap throttle test which would see the voltage spikes rise.
Secondary ignition missing occurs when voltage required exceeds voltage available. This is why a marginal ignition system will miss going up a hill or under acceleration.
If you were to follow the opposite view, as posted below, to its logical conclusion, then cars would miss at idle and then smooth out under load and acceleration. This is of course absurd.
I am somewhat skeptical that sparkplugs fire with the lowest voltage at the stoichiometric fuel ratio of 14.7 to 1. The stoichiometric mixture is the perfect mixture for controlling emissions of CO, HC, and Oxides of Nitrogen because it is in this window that the graphs of these three pollutants intersect. If the engine is run leaner, CO and HC will go down but NO will go up. Conversely, if the engine is run richer NO will go down, but CO and HC will go up. However if we are merely interested in smooth idle, such as a farm tractor with no emission requirements, then I believe 14.7 is a little too lean.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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