Looking for low-cost ignition analysis 'scope

[Steve Baldwin]

You can use a clothes peg and a bit of foil to make a capacitive clamp.
You almost don't need the foil. Just use the peg to clip a bit of wire
to the spark lead and make a capacitive divider by putting a high
voltage 1nF cap across the scope input. A bleeder resistor across the
1nF is a good idea.
It isn't calibrated but it shows what you want to see.

An inductive clamp is going to show you the current flowing which isn't
quite the same. A fast (as in spark breakdown) current probe is serious
dollars.

Hmmm ... so far we have clothes peg ignition analysers (Peter, should
that have a 'z' ?) , saw blade timing wheels and light bulb flow meters.
Thisis _real_ DIY. :-)

Steve.