Posted by LenNH on February 28, 2010 at 06:33:11 from (24.60.236.239):
In Reply to: Crank Starting posted by Bud W on February 27, 2010 at 10:24:45:
It is true that a generator is "self-energizing," that is, it doesn't depend on a battery to get it started charging. But....the generator produces very little current until it is turning pretty fast, so I doubt very much if it would produce enough voltage to fire a battery ignition system. Please.....make sure everything is timed right, AND keep your head away from the crank. Do NOT push down on the crank, or spin it, no matter what you do. If there is enough spark to fire the engine, spinning will not make any difference. In the "old days," people used to think that spinning the crank would produce a hotter spark (with a magneto), but at a certain point in their production (I'd guess by at least 1910, but don't have any facts on this), magnetos were given impulse starters, which 1) hold the mag back until the engine reaches TDC, or maybe a bit beyond TDC and 2) spin the mag to provide a hot spark. It is probably true that spinning a Fordson would have provided a hotter spark. The Fordson (and Model T) flywheel magneto had no kind of impulse starter, so the voltage could have been raised by spinning. A LOT of people forgot to retard the spark on Fordsons and Ts, and a lot of people discovered how much force is produced by an engine spinning backward. My father broke his arm by pushing down on a Ford T crank. 'Nuff said, I hope.
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