Fw: [Diy_efi] OT - cap/rotor clearance

[Rick McLeod]

I would have to say that the least resistance in the
path to the plug gap will optimize the spark and flame
front. Take a lead from the coil-on-plug designs, very
minimal secondary resistance there.

By reducing the gap in the dizzy, you then place the
control in the ammount of energy the coil can store in
standard breaker designs or the energizer of the
ignition system vs. the gap the voltage must jump to
create the spark.

Give me less variables to deal with and repeatability
will improve, therefore tunning will be easier.

Bottom line, the gap in the dizzy should be the least
ammount to prevent mechanical interferrence while
rotating with inclusion of radial play. This will also
minimize carbon tracks created by arcing that
ultimately will become resistance to the flow,
therefore reducing consistancy over time. and the same
for timing consisitency.

hth

--- Geoff Harrison <geoff_h at smartchat.net.au> wrote:

> I have heard about this theory. Lets take it to
> extremes. Lets make the gap 
> at the rotor 15". The gap in the plugs 40thou. How
> much spark will we get at 
> the plug?
> 
> The overall gap, i.e. that in the dizzy plus that in
> the plug can slightly 
> effect timing. The more gap, the higher the voltage
> required to bridge the 
> gap. So the spark occurs later. That's why the old
> series type timing lights 
> weren't that accurate.
>