mixture, which burns more rapidly. In this case some retardation of timing is
necessary. Overall, under any condition of engine speed and load an ideal
advance angle is required to ensure maximum pressure is achieved in the
cylinder just after top dead centre. The ideal advance angle may be further
rened by engine temperature and any risk of detonation.
Spark advance is achieved in a number of ways. The simplest of these being
the mechanical system comprising a centrifugal advance mechanism and
a vacuum (load sensitive) control unit. Manifold vacuum is almost inversely
proportional to the engine load. I prefer to consider manifold ...
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