[Gmecm] Reluctor / rotor phasing

[Tracy and June Hooker]

Bruce,
After thinking about your post, you are of course, exactly correct.  The
actual position of the rotor and the reluctor wheel is set, and cant be
changed.  However, I can change the plate that the vacuum advance was
attached to, so that can independently adjust the timing relationship
between reluctor signal and the ignition module input.

So, I guess a rephrased question is:  How do I know where to lock down the
vacuum advance plate?

Tracy
 

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of bcroe at juno.com
Sent: Tuesday, September 13, 2005 10:38 PM
To: gmecm at diy-efi.org
Subject: [Gmecm] Reluctor / rotor phasing

Inserting the distributor on a different tooth will change 
the angle it must be turned in the engine, but it will 
have no effect on reluctor / rotor phasing.  That is 
determined inside the distributor, and by the range 
of spark advance.  Mechanical advance doesn't change 
phasing, since the rotating poles and the rotor are locked 
together.  Phasing is definitely affected by a vacuum unit. 

Phasing is more difficult with electronic advance, because 
BOTH rpm (was mechanical) and vacuum advance change 
the phasing.  The rotor overlaps the spark wire terminal 
for quite a few degrees of rotation.  You want to have a 
minimum overlap over the entire advance range.  That 
can be adjusted by adjusting the fixed pickup coil position 
(similar to the vacuum advance).  I have a transparent 
HEI cap for this, but a big hole works too.  

Bruce Roe

13 Sep 2005  Darryl M Gilbert <dgilbert78 at juno.com> writes:
>  I did this once when i was checking an ignition problem
> and found I had my dist 1 tooth out, so the phasing was 
> off
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