Separate coils / knock retard.

[Einar Sjaavik]

There is no need for separate coils to do knock retard on
a per cylinder basis. The controller just needs to know
how many cylinders it's controlling. If it's a 6cyl. engine,
just wait 5 cylinders then retard the next. Do this for each
and every cylinder.

You could also measure the average noise level and use this
to modify the threshold you define as knock. This way the
influence of valve noise can be made less of a problem.
On the other hand; if you have valve or bearing noise, the
engine could be saved by the resulting power loss from a
retard. And you have an indication something is wrong. Just
remember it need not be the ignition itself. It can be an
advanced state of engine wear just fooling the knock sensor.

And could you please cut everything except maybe a few lines
when responding? Much of the time I don't bother to search
through the echo to find _your_ statement. Result is it doesn't
get through. And as to the "bother" of sending attachments; please
don't.


--
einarp at ade.no  ( Maserati Biturbo Spyder )