[Gmecm] Reluctor / rotor phasing

[Darryl M Gilbert]

Hello: This is all quiet simple. lock it down where the spark has to jump
the shortest distance. Just set the rotor to spark at dead center of the
plug tower at 0 deg timing (set timing connector disconnected) Run the
engine and look inside the dist. Play with it a little to see what
happens. But in the end you want to adjust your setup to get the shortest
spark travel possible. You might even have the rotor toward the trailing
edge of the tower at 0 deg , and as the advance comes in it will be
closer to center or possibly leading edge of tower. The engine will run
fine even if the spark has to jump some distance, but best to have it
jump the shortest distance
good luck
Darryl...
On Wed, 14 Sep 2005 07:43:22 -0600 "Tracy and June Hooker"
<thooker at nmsu.edu> writes:
> 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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