>> Perhaps because you may end applying power against the engine rotation
>> and generate a knock.  There is a safe maximum advance limit.
>
> Olin said:
> You can't have it both ways.  Either the combustion is delayed due to a=20
> weak
> spark or its not.  If it's delayed, then advancing timing to compensate
> shouldn't cause knocking since the actual combustion still happens when=20
> 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.

Perhaps we should view it like any other engineering problem and ask=20
ourselves what the worst case values are. For example, if we advance the=20
spark only to a point which avoids knock under certain conditions will that=
=20
still work under different temperatures, atmospheric pressures, variations=
=20
in fuel, phase of the moon, presence or absence of dead fish, etc, etc, etc=
..

-- Bob Ammerman
RAm Systems

--=20
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