[Gmecm] Reluctor / rotor phasing

[Darryl M Gilbert]

Yes: By phasing i mean relationship of rotor tip to plug tower. On non
electronic distributors this could be adjusted somewhat by loosening a
screw here and there and moving breaker plates etc. If the Dist is
homemade than proper pick up to plug tower phasing must be considered.
The rotor tip to plug terminal can be off quiet a bit and cause the spark
to jump a great distance and the engine will appear to run just fine. But
as you say a clear cap or one with a hole hogged out does the trick.
hogging a hole is better because you can see inside clearer. I have one
that I hogged all 8 towers out and drove the car that way for some time
before i removed it. Luckily no rain got in there Ha!. 6 deg of crank
rotation is only 3 deg of dist rotation. Even at high RPMs the spark
usually has a short distance to jump if all is aligned properly. I bet
there are a lot of dist's out there that could be improved upon in that
area.
Darryl...
On Wed, 14 Sep 2005 00:38:23 -0500 bcroe at juno.com writes:
> 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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