Re: flacky pretronix !

[Eric Hegstrom <ehegstrom@domain.elided>]

Of course it has nothing to do with _when_ the coil fires, but if it's
to far off won't the rotor be out of whack with the right spot on the
cap.


I guess what I'm saying:

Let's assume TDC timing. No matter how we look at it the rotor is going
to be pointed the same direction at TDC no matter where the sensor is
placed. Is this correct. If not then just stop now ;)

So  we have to rotate the distributor(and cap) to get whatever device to
trigger when the rotor is in this position.

But if the triggers (pertronix, points, optical etc) are in different
locations then the rotor will be in different locations when the coil
fires. If the rotor is to far out of whack from the cap won't this miss
the the little nub on the cap that feeds the spark to the right plug?
(What's that nub called anyway?)

It seems to me that the geometry of the sensor placement on the
distributor is also important (though it just has to be close).

Where have I messed up in my thinking?

Peace,
Eric


"John A. Landry" wrote:
> 
> The aliens commander decided Eric Hegstrom <ehegstrom@domain.elided>
> would make a perfect specimen for dissection, and he yelled...
> 
> >After changing them out I had to
> >rotate my distributor a good amount (maybe 20degrees) ccw to get back to
> >TDC timing. This seems very strange
> 
> Eric,
> 
> This is actually quite normal when you think about it.  The exact placement
> of the sensor inside the Pertronix module and the exact positioning of the
> magnets over the cam inside the distributor dictate when the coil will be
> grounded (and the spark plugs fired).  This positioning is naturally going
> to be different than with the breaker-points.  Nothing to worry about.
> 
> John L.
> --------------------------------------------------------------------------
> jlandry AT halcyon DOT com      |
> Conservative Libertarian        |  "The road to  tyranny, we must never
> Life Member of the NRA          |   forget, begins with the destruction
> WA Arms Collectors              |   of the truth."
> Commercial Helicopter - Inst.   |                     William J. Clinton
> http://www.halcyon.com/jlandry/ |    10-15-95, speech at the Univ. of CT

-- 
Eric Hegstrom                          .~.
Senior Software Engineer               /V\  
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