Isaac Marino Bavaresco wrote:
>>> This may not be important at low RPM, but at higher RPM, the faster
>>> the combustion the most efficiency you get.
>>> If the ignition takes too long, the pressure is not at the maximum
>>> when
>>> it would be more effective, that is, in the first 90 degrees of the
>>> down-stroke.
>>
>> If that's the only reason, why can't you just advance the timing to
>> get the same effect?
>
> Perhaps because you may end applying power against the engine rotation
> and generate a knock.  There is a safe maximum advance limit.

You can't have it both ways.  Either the combustion is delayed due to a wea=
k
spark or its not.  If it's delayed, then advancing timing to compensate
shouldn't cause knocking since the actual combustion still happens when you
want it to.  If a weak spark doesn't delay combustion, then we're back to
looking for a reason a stronger spark is necessary.


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