Re: OT: BS engine

Posted by Texasmark1 on September 03, 2016 at 05:19:04 from (184.63.42.169):

In Reply to: OT: BS engine posted by howdy1960 on September 02, 2016 at 18:10:53:

Permeability of the rust is better than the air it replaces. Don't worry about it. It will rust again anyway and the motor will still run. On the magnet being backwards what that does is determine the timing of the impulse; may be a factor, see below.

As the magnet passes the coil it generates a sine wave of current in the windings which make the full 360 +/- degrees plus a little ringing of what's left of the energy in the core. Since "magnetrons" ( a term Raytheon Corp. assigned to an electromagnetic microwave emissive tube....common usage RADAR and microwave ovens; a "trigger word" recently picked up by a small engine mfgr.) are inductive pickup devices without the need for any supporting electronics, if it doesn't run, and the magnet being backwards, it comes down to whether the plug fires adequately on the polarity of the pulse that occurs at the BTDC position necessary for operation. Research had been done on the polarity of plug voltage and the erosion of the electrodes.... aka ion migration.

Course the gap is part of that too because the gap determines the coupling between the magnet and the iron core of the magnetron (pickup coil) and as the coupling changes the intensity of the signal changes which changes the timing.....the plug fires at a certain voltage and the higher the applied sine wave, the faster you reach that voltage.

If you have an ignition point system, you don't need the flywheel magnet. The points close, allowing energy to collect in a remote coil and at the preset mechanical time, they open and the coil releases that energy into the plug.

I know this much. Half a woodruff key (flywheel to crank shaft lock) in a partially sheared condition is enough to throw the timing off enough to prevent satisfactory operation. BTDT

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