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Re: static timing

To: "Austin Healey" <healeys@Autox.Team.Net>
Subject: Re: static timing
From: "Bob Spidell" <bspidell@comcast.net>
Date: Sun, 16 Jan 2005 12:59:28 -0800
Jorge,


Probably not (emphasis on "probably" ... I've never tried it).

Unlike points--which supply current to the primary ignition system as
long as they are closed--the Pertronix unit supplies current for a fixed
period ("time constant") regardless of the rotational speed of the distributor 
shaft (this is why Pertronix-equipped cars run smoother across a greater 
RPM range).  In other words, when it's triggered by one of the rotating magnets 
the
Pertronix switches current to the coil, then breaks the circuit after a fixed 
time
period, and the collapsing field in the primary creates the voltage in the 
secondary circuit to fire the spark.  I would think it would be nearly 
impossible
to capture this event with a static timing rig (plus you risk damaging the 
Pertronix
unit).

Are you sure the Pertronix is installed correctly?  When I installed mine, the
timing was way off, but close enough to get the engine started and do a 
dynamic timing check.  Unlike a points system, which switches the current
to ground, the Pertronix switches current above the coil and you need an
alternate ground circuit.  I used the lead to the battery cutoff switch, after 
moving it to the other terminal on the switch.


bs

********************************************
Bob Spidell         San Jose, CA        bspidell@comcast.net
'67 Austin-Healey 3000             '56 Austin-Healey 100M
********************************************



>I recently replaced the points and the coil on my BJ8
> with a Pertronix electro and coil to see if it would
> eliminate a terrible missing/backfiring problem that
> occurred @3000 rpm, now the engine will not start.
> Can you use the static method of timing the ignition
> on a car using an electronic ignition?
> Thanks
> Jorge Garcia  




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