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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: picking up ignition
Date: Sat, 28 Sep 2002 14:19:51 GMT
NNTP-Posting-Date: Sat, 28 Sep 2002 07:19:51 PDT
Kevin Kilzer wrote:
> On Fri, 27 Sep 2002 20:50:58 GMT, "Peter Linotte"
> > I want to measure the discharges of sparkplugs. What's the most clever way
> >to do so ?
> >Some windings surrounding the cable attached to the sparkplugs and "zener"
> >it ? or is there a better way to do so ?
> In the old days, oscilloscope probes had alligator clips on the end,
> instead of the fancy hooks they now have. We just clipped the probe
> to the _insulation_ of the spark plug wire.
> You get a spike when the contacts close, and a bigger spike when the
> plug fires.
> Assuming you have a 4-cylinder engine, use the variable sweep to set
> the little spikes 9 divisions apart (180 degrees). The scope then
> reads dwell in 20 degrees/division. 6- and 8-cylinder engines are
> similar, but the little spikes are at 120 and 90 degrees.
You see. It is highly ambiguous what he wants to measure. You suggest
dwell but that is most easily measued on the primary wire. Dwell has no
meaning with capacitor discharge ignitions and has little to do with
anything with modern distributorless ignitions. Perhaps he wishes to
detect burned or fouled plugs. That shows up in the high voltage.
Perhaps he wishes to check timing on a distributorless engine by timing
from the fiducial sensor. I can think of a number of things to measure.
He didn't say which thing he wanted to measure.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons email@example.com
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