Re: IML: Electronic Ignition

[PAUL WENTINK <randalpark@xxxxxxx>]

You can probably buy an adjustable vacuum advance for the existing 
igintion system, but if everything is working right, it isn't 
necessary. The car can be tuned to not ping at all under light load, 
heavy load, etc. with the original system. If it can't be, then there 
is something else wrong with it.

Still afar, I would start by looking for a vacuum leak and go from 
there.

Paul W.


-----Original Message-----
From: Geoff Fors <wb6nvh@xxxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Wed, 10 Oct 2007 10:37 am
Subject: IML: Electronic Ignition



I guess I should have given more information about my question.

The pinging I am referring to is at light load with part throttle after 
the
engine is warmed up.  It probably pings at full throttle under heavy 
load as
well but that's a driving condition I rarely if ever encounter.

My idea with the electronic ignition was that the vacuum advance was
adjustable.  The vacuum advance on my stock distributor is not 
adjustable in
the same way, at least as far as I can tell, but that's a good point and
I'll examine it more carefully. It's a Standard-Blue Streak replacement 
and
I never checked to see if the original Mopar one was adjustable.  The 
OEM
kit electronic ignition vacuum advance has an allen wrench-adjustable 
setup.
There is no pre-detonation with the present vacuum advance disconnected.
Nor is there any with some 100LL aviation gas mixed into the tank, but
that's not a practical solution.  That's also a good point about the
mechanical advance, I'll have to chart the curves and do some 
experimenting.

This is a stock 1967 setup.  The timing chain and sprockets are new. The
heads are completely re-done with hardened seats and new exhaust valves.
Nothing was done at the time to alter the compression ratio and in 
fact, the
usual surfacing of the heads in the rebuild process probably raised it
slightly.  There is no carbon in the combustion chambers. The radiator 
is
freshly rebuilt, with a new core, and the water pump is also new. It 
does
not overheat. The carburetor is a fairly worn-out original AFB, which is
going to be replaced shortly as it has some unrelated issues.  It could 
very
well be running lean, I'll check that too.  Oh, and yes, the dwell is
correct as is the timing, and the points are new.  The plugs are new and
gapped correctly, but as pointed out, it's becoming hard to find other 
than
a  "one size fits all" heat range, so the plug heat range probably isn't
optimum.  The heat riser isn't stuck and functions correctly.  The 
exhaust
system is fairly recent and in good shape.

Geoff
Monterey CA


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