Oyvind Kaurstad <oyvind.kaurstad@NOFAC.ABB.NO> wrote:
>
>A 4-stroke engine has (you guessed it) 4 strokes.
>Intake, compression, ignition and exhaust.
>
>The complete prosess takes two revolutions of the engine. The spark plug
>fires once in this period, ie every other revolution.

    Not necessarily true.  My BMW cycle has a four stroke engine
    and each plug fires once per revolution.  The waste spark
    on the exhaust cycle does no harm and eliminates the need for
    a  distributor.


--
Bob Fehrenbach    Wauwatosa, WI     bfehrenb@execpc.com