Re: Higher octane??

["Dennis C." <dennis.2914@xxxxxxxxx>]

You may want to start at the beginning and determine exactly what your
mechanical and vacuum advance is doing.  It is not common but it does
happen that the pointer is off or the dampener has slipped and
indicating the wrong timing.

It is not too hard, determine TDC of #1 piston by using a tool or
making your own.  When you know that the piston is exactly on TDC
check the pointer.  If it is not indicating TDC then this is the first
thing to correct.

When you have verified TDC get a timing tape for your engine or use a
timing light with the knob to read advance.  I have not had any luck
keeping tapes on long but you will be able to keep it on long enough
to get the data you need.  It will help to have a friend watch a tach
and write down numbers.

With the vacuum advance off and plugged you will be able to record
initial timing.  Then increase speed until you get max mechanical
advance, record the advance in degrees and rpm.  Do the same with the
vacuum advance connected.

This will give you base line numbers.  You can post the numbers and I
am sure you will get comments.

If it pings when you put your foot in it vacuum advance should be out
of the picture, you should be just getting mechanical.  You can try
driving with the vacuum advance disconnected and plugged to completely
eliminate it as a problem.

Here is an interesting article that may help:

http://www.sweptline.com/tech/engine2.html

Dennis C.

On Nov 20, 8:24 am, Jacob Fox <imfast...@xxxxxxxxx> wrote:
> In my manual my 383 needs high octane. I still don't understand why I have so much pinging when I punch the accelerator. I've tried timing, I made sure my advance was working by watching timing with advance hooked up I run the high octane idk what else to do! Lol
>
> Sent from my iPhone
>
> On Nov 20, 2011, at 8:06 AM, "Gary H." <62to65mo...@xxxxxxxxxxx> wrote:
>
>
>
>
>
>
>
> > Any pinging or spark knock?
>
> > From a BP document:  Increased octane does not increase power.
>
> > Higher compression and improved engine breathing will increase power.
> > These modifications may lead to detonation or combustion knock which is
> > then eliminated by using fuel with a higher octane.
> >www.powerchipgroup.com/articles/PET0605.pdf
>
> > Thanks,
> > Gary H.
>
> >> -------Original Message-------
>
> >> Now I think know the answer to this question, but I'm gonna ask it any
> >> way.  Should I be running higher octane gas in my 440?  It's a 1970 engine
> >> with a bit of a cam, new rings, and stock heads with high rise exhaust
> >> manifiolds.  It's in my 65 Polara. ...
>
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