Jim:
I am afraid I don't understand your comment. Wouldn't the plug
with the lowest resistance get the spark? Electricity (at least the
British variety) is lazy and wants to take the path of least resistance.
This is why a short to ground always causes consternation and loss of
smoke in British wiring systems.
When I have read about "wasted spark" ignition systems, it was
the variety where the plug always fires at TDC (or earlier). One spark
occurs at TDC on compression in the usual manner, and one spark occurs
at TDC during the exhaust stroke (the "wasted spark"). This allows one
coil to service two cylinders, and thereby allows one to eliminate the
distributor with its moving parts. This scheme requires 3 spark coils
for a 6 cylinder engine, and each pair of cylinders has their plugs
connected in series so that *both* plugs fire together. The paired
cylinders are out of phase by 360 degrees so that one cylinder is on the
compression stroke when the other is on the exhaust stroke.
Could you elaborate a bit on this variety of ignition? I will
check out the web site you gave, but I must admit this is a new twist on
ignition that I am unfamiliar with. Sounds intriguing though...
Vance
-----Original Message-----
From: owner-6pack@Autox.Team.Net [mailto:owner-6pack@Autox.Team.Net] On
Behalf Of James Franks
Sent: October 03, 2007 5:40 AM
To: Mark Hooper
Cc: 6pack@autox.team.net; triumphs@autox.team.net
Subject: Re: [6pack] EDis
Yes, it is the 36-1 wheel. That's 36 teeth with one missing tooth which
EDIS uses to locate TDC. EDIS is wasted spark, so the ignition doesn't
care which cylinder is on compression at TDC. It fires the coil and the
one with most resistance, ie the one on compression, gets the high
energy spark.It's a very ingenious system I think.
<snip>
Jim Franks
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