Steve,
I was counting on you to provide this guidance on the Pertronix, as you have
previously on this subject. I would only add just a point of clarification
on "hot" 12V coils. A 12V coil is not necessarily "hotter" than a 9V coil in
terms of either putting out more voltage or more power, which are two
distinct concepts. I believe the important parameter in the combustion
chamber is the energy and time duration of the electrical discharge. The
open circuit output voltage of a coil is pretty much moot point in the "real
world" where the maximum voltage is generally limited by the spark plug gap
and chamber compression. Having stated this, I realize this is a gross
simplification and there are the impedance and induction of the spark plug
wires, etc., etc., to consider. But, getting back to the subject, one
shouldn't steer away from a 12V coil, or favor one, based on the (erroneous)
assumption that a 12V coil is going to give 12/9 or 1/3 more voltage and/or
energy output. If, on the other hand, one wanted to design a "hot" coil, it
would be best to start by using the full, unfettered 12V.
Bob
-----Original Message-----
From: owner-tigers@autox.team.net [mailto:owner-tigers@autox.team.net]On
Behalf Of Steve Laifman
Sent: Thursday, September 27, 2001 8:54 AM
To: CE25593@aol.com
Cc: tigers@autox.team.net
Subject: Re: Ballast Resistor
CE25593@aol.com wrote:
>
> I am in the process of rewiring my Tiger with a Peerless system I am
seeking
> guidance on the ballast resistor. Is it truly necessary? I've seen some
> Tigers with one, and some without. I will be running the Petronix
ignition.
> Your assistance is appreicated.
>
> Bob Haynes, San Diego
> B382000793
Bob,
If you are using the original Pertronix, you MUST use THE ballast
resistor that comes with, or meant for, the "points type" ignition coil,
and that coil.
If you are running the Pertronix II, you can use a full 12 volt hot
coil, and do not need the ballast resistor, as the unit can handle the
higher current. You can also use the original points type coil, as the
voltage increases dramatically with a hot 12 volt coil, and may require
those larger distributor caps to prevent arcing.
Not sure is, on the Pertronix II, the standard type coil (9 volt) must
also use the ballast resistor to prevent over heating of the coil. I'd
use resistors with resistor coils.
Steve
--
Steve Laifman < Find out what is most >
B9472289 < important in your life >
< and don't let it get away!>
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