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Hi all, this tread is for applying Luc's spark method specifically to magneto systems.
Here is a touch on magnetos that I got from some old Keely net article:
If that is all one does to the engine, then there is no external energy
inputs, such as a battery. The ignition system on the standard Briggs &
Stratton 3HP lawnmover engine is called a "Magneto Ignition System" (MIS).
The MIS works as follows from start-up (very basic):
(a) The manual starter cord is pulled
causing the flywheel (with magnets
mounted on it) to turn.
(b) The flywheel then causes the crankshaft,
camshaft, and piston to which is
connected, to move, as well as causing
the magnets to pass by the ignition
coil, which induce a current and thus
voltage to flow through the coil.
(c) (when point(s) are closed)
As the flywheel magnet passes by the
ignition coil, the magnet in motion
creates an electric current in the
primary circuit, which is completed
to ground at both ends because the
crankshaft lobe has allowed the
moveable breaker points to close.
(d) (when point(s) are opened)
The flywhell magnet has passed by.
The crankshaft lobe opens the breaker
points, causing the electromagnetically
charged field of the primary circuit
to collapse upon the secondary circuit.
This results in high-voltage current to
the spark plug- the terminal of the
secondary circuit.
Here is a touch on magnetos that I got from some old Keely net article:
If that is all one does to the engine, then there is no external energy
inputs, such as a battery. The ignition system on the standard Briggs &
Stratton 3HP lawnmover engine is called a "Magneto Ignition System" (MIS).
The MIS works as follows from start-up (very basic):
(a) The manual starter cord is pulled
causing the flywheel (with magnets
mounted on it) to turn.
(b) The flywheel then causes the crankshaft,
camshaft, and piston to which is
connected, to move, as well as causing
the magnets to pass by the ignition
coil, which induce a current and thus
voltage to flow through the coil.
(c) (when point(s) are closed)
As the flywheel magnet passes by the
ignition coil, the magnet in motion
creates an electric current in the
primary circuit, which is completed
to ground at both ends because the
crankshaft lobe has allowed the
moveable breaker points to close.
(d) (when point(s) are opened)
The flywhell magnet has passed by.
The crankshaft lobe opens the breaker
points, causing the electromagnetically
charged field of the primary circuit
to collapse upon the secondary circuit.
This results in high-voltage current to
the spark plug- the terminal of the
secondary circuit.
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