Dave,
What you have there is the truth --- but! That's for a very simplistic model
of a transformer in an alternating current circuit. The automotive spark coil
is not that simple. The early comment about sensitivity to the input current is
closer to the truth, it's actually the rate-of-change of the input current.
There are a lot of factors involved but, in general, if the primary circuit is
driven from a higher input voltage, you would expect a higher output voltage.
Dave Wood wrote:
> Larry,
>
> I'm not an electrician, but I have had a bit of college physics and there is
> a formula to calculate the output based on the input that depends on the
> number of windings on the input side versus the number of windings on the
> output side. So if 12 volts puts out 40,000 volts, 6 volts should put out
> 20,000 volts and any proportion in between for other changes in input
> voltage. Anyone care to correct this?
>
> Dave 72 B
> -----Original Message-----
> From: Larry Hoy <larryhoy@prodigy.net>
> To: paul.hunt1@virgin.net <paul.hunt1@virgin.net>; mgs@autox.team.net
> <mgs@autox.team.net>
> Date: Wednesday, July 26, 2000 10:16 AM
> Subject: RE: Ignition Coils
>
> >I just talked to MSD (a company that builds high output ignition systems)
> and
> >was told that the "volts in" doesn't have anything to do with "volts out".
> The
> >tech's comments were that amps are more critical than volts. Any input
> volts
> >between 10 and 16 will always result in the same output voltage.
> >
> >Could this be true?
> >
> >Larry Hoy
> >
> >>-----Original Message-----
> >>From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
> >>Behalf Of paul.hunt1@virgin.net
> >>Sent: Wednesday, July 26, 2000 8:29 AM
> >>To: Geoffrey Gallaway; mgs@autox.team.net
> >>Subject: Re: Ignition Coils
> >>
> >>
> >>A higher voltage coil allows you to open the plug gaps a little so the
> >>voltage builds more before it jumps the gap and you get a bigger spark.
> >>Unfortunately this higher voltage can cause problems (i.e. breakdowns and
> >>missing) elsewhere in the ignition circuit unless it is all in top-notch
> >>condition.
> >>
> >>PaulH.
> >>
> >>----- Original Message -----
> >>From: Geoffrey Gallaway <geoffeg@sloth.org>
> >>To: <mgs@autox.team.net>
> >>Sent: Monday, July 24, 2000 2:36 PM
> >>Subject: Ignition Coils
> >>
> >>
> >>> I just bought a stock ignition coil from propermg for 19.95 although I
> >>> could have bought the Lucas sports coil at 40,000 volts for a few
> dollars
> >>> more. ProperMG is having a sale right now!
> >>>
> >>> So, what voltage is the standard coil, 20,000 volts? How much does the
> >>> sports coil actually gain? I would imagine MG put a coil that was more
> >>> than satisfactory on the car when they sold it and adding higher voltage
> >>> coils only helps a small bit. Am I totally off here?
> >>>
> >>> Geoff
> >>>
> >>> --
> >>> Geoffrey Gallaway || Violence is only for those who have run out of good
> >>> geoffeg@sloth.org || ideas.
> >>> D e v o r z h u n || -- Doug
> >>>
> >>>
> >>
> >
> >
--
Bud Krueger
http://home.ici.net/~bkrueger/
52TD
77MGB
|