On 07/03/2011 21:40, Andre Abelian wrote:
> Michael,
>
> I know one thing for sure that the rotor has 4 magnets and 1 turn of roto=
r will
> fire 4 cylinder.
> I just do not understand what does "Four stroke is 1 spark every two revo=
lution"
> means?
> can you give and example?
>
> thanks
>
> AA
The four strokes
Revolution 1
INTAKE stroke  Piston descends and sucks in air and fuel (inlet valve open)
Compression Stroke,Piston rises (all valves closed)  Piston rises and=20
just before top dead centre, spark is applied
Revolution 2
Piston descends due to ignition of fuel/air mixture gas pressure
Exhaust stroke (exit valve open), piston rises and pushes out waste=20
exhaust gases.

So each cylinder gets a spark once every two revolutions.
With four cylinders, each compresses and gets a spark in turn, so 4=20
sparks every 2 revolutions. Cam has 4 bumps for "points" or 4 magnets=20
and distributor cap on same shaft, four contacts.
*

*
--=20
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