[Zmagnette] ignition update

[charles durning]

Back in a past life when I worked for a living I would run into the
backfiring symptoms you stated.  I found that, typically. there are 3
places where I would look.  A plugged or restricted exhaust.  That was
problem when car were fitted double wall exhaust pipes.  The inside pipe
would collapse.  Another was a bad condencer, even if it was new.  I wish I
still had my condencer tester.  and the last was a lean mixture.  All of
those can come on suddenly, will cause a backfire through the carbs, and
limit top speed.  I would doubt the restricted pipe but would not rule out
a restricted muffler.

For the exhaust just put your hand at the end of the pipe and feel if you
are getting any exhaust out.  For the condencer, just replace it.  For the
lean mixture, check the fuel delivery to the carbs,  pressure and volume.
Replace the filter.  Check the draw tube in the tank and the filter screen
in the bottom of the tank.  Have the needles fallen out of the dashpots in
the carbs.

My Magnette had a combination of all of those that I had to correct before
the car would run right.  It would run but not well.


Charlie Durning

If you are using Google or Gmail, Big Brother is watching.



On Wed, Oct 30, 2013 at 7:35 PM, Fletcher Millmore <
gofanu at cust.usachoice.net> wrote:

>  If changing the coil "fixed it" but it then got worse, it likely had
> nothing to do with the coil.  And the old coil was providing spark - a coil
> cannot tell which cylinder is firing, so should usually be the same on all
> holes.
> It is possible that a "better coil" would hide and/or exacerbate some
> other deficiency, like low voltage to the coil, or faults in the HT side.
>
> Check the internal earth lead from the points plate to the distributor
> body - they break with age, and cause just this sort of behavior. The break
> will be (usually) at one end, but if not the super  fine braid wire will
> pull out of the braided silk insulation. It is not rare that these have
> been replaced by inappropriate stiff wire, which fails quickly.
>
> If that is not it, call back with an updated sequential and complete
> listing of exactly what has been done/changed and results.
>
> FRM
>
> On 10/30/2013 7:11 PM, jtdbrough2 at netzero.com wrote:
>
>
>   I guess the car just didn't want to go to a show. Dennis replaced the
> coil and it seemed to work fine. The next morning however it started
> backfiring  A LOT and in juice as it wouldn't go above 40 and then it would
> go at speed. possibly wobbly wheel then started up as well. Fiddling with
> the distributer seemed to help some of the back firing issue but it kept
> happening. so the car stayed home (started working just fine when we got to
> within a mile of the house or so go figure-more than a mile away not so
> much whether coming or going) and we went.
>
> Buckey suggested checking the dashpots which Dennis hadn't thought to do.
> Anyone else have any suggestions? I left to go look at cars so othter than
> dashpots I didn;t get the impression that there were anyother suggestions.
> Joyce
>
>
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