to our world of PERFORMANCE IGNITION.
The ignition system is a part
of the engine that so many ignore, or just do not understand, thinking there original distributor is
going to cope with the hundreds of pounds they have spent
on it, its as important as putting petrol in the tank, as
any good engine tuner will tell you, its important that timing & rate
of advance through the rev range is right.
So why is it important for accurate
spark timing? Or spark advance as it is often reffered to,
so called, because the spark needs to keep up with the rising
Spark timing is just that, the
delivery of the spark at presicely the right time inside
the combustion chamber, get this wrong and its not going
to work, those expensive pistons are going to end up being
even more expensive to replace.
That’s just the first part
of what the distributor does, now we have to keep the spark
there at the right time, all the way throurgh the rev range,
this is achieved with mechanical centrifugal advance and
in standard tune, vacuum advance, this consists of weights
and springs, the right combination of of springs is essential,
that’s the art to distributor modification.
This is referred to as the curve;
it gets its name from being shown as a graph, with all the
timing points shown as dots, all the dots are then joined,
there is the curve.
Now we come to how much advance
the engine needs, all engines are different, modified engines
don’t need as much advance as standard engines, this
is often the reason an engine can be heard pinking throughout
the rev range with a standard distributor, the total amount
of advance is often much less on modified engines. Hence
the importance of a modified distributor, STANDARD
ONES WILL NOT DO.
your distributor cope!