Timing marks are overrated,,,,,JM2C
In a message dated 11/20/2011 5:36:55 P.M. Central Standard Time,
dennis.2914@xxxxxxxxx writes:
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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