Re: IML: Electronic Ignition

["sjak brak" <imperial1973@xxxxxxxxx>]

I would start with checking this first:

 

>> 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.

 

If this also doesnt cure the problem, there are 2 other (likely) possibilites:

- spark is too weak

- octane rating of te fuel is too low

You could try filling a tank withthe best fuel you can find and add some octane booster. If this doesnt solve the problem, see if you can borrow a performance ingition from someone and see if that makes the difference.

 

Also, maybe someone can borrow you a performance coil & ignition box. I know opinions differ on these parts, but take my word on it, my MSD ignition (Probillet distributor, Blaster SS coil, MSD 6AL box, adjustable timing control) for sure woke up my 440, both performance and economy improved; the drawback of this system is that the spark is so aggressive that it eats a setof plugs within a few thousend miles LOL, and the purchase price is not justified if you're not into trick gadgetry for your car.

 

But for just some relaxed cuising, a standard electronic ignition will do the job as well. In my opinion, FBO delivers the best spark for the buck, only slightly more expensive than the MP parts, but MUCH better.

 

Sjak

 

On 10/11/07, PAUL WENTINK <randalpark@xxxxxxx> wrote:

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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