ok look here is the deal all gas has the same amount
of energy in it the only difference the that 91 octane
will not detonate as fast as 89 octane when the heat
in the cylinders build up the engine will start firing
before the spark plug fires so the highter octane will
keep it from pinging because it is not detonating
before it is time for it to fire
Frank 94 5.2 spoRT
http://members.onecenter.com/autoworld/dakota/index.html
--- Jon Smith <fast4x4@nc.rr.com> wrote:
>
>
> > Now I'm really confused. With a stock computer,
> everyone, and I mean
> > EVERYONE is saying that you need to install colder
> plugs. This bit of
> advise
> > is being told to everyone whether they have ping
> problems or not. Check
> the
> > archives and one thing will stand out "Get 5223 or
> 3923 Autolites and your
> > truck will run better". There is even someone who
> says they have a dyno
> > chart that shows the colder plugs develop more
> horsepower.
>
> me.. http://www4.ncsu.edu/~jdsmith4
>
> Now I understand
> > that colder plugs retard the timing a bit, but if
> this is bad, then why is
> > everyone being told to install them?
>
> colder plugs do not retard the timing in any way,
> shape or form
>
> >
> > Yes, I know the MP comp advances the timing and
> this is one of the ways it
> > makes more power so I would be defeating the
> computer to an extent, but I
> > still eliminate the ping right? And at fraction of
> the cost of constantly
> > filling up with more expensive gas. On the stock
> computer, 89 and higher
> > octane made my trucks performance drop. The power
> wasn't there and my
> > mileage went down.
>
> as Bernd posted, the MP comp advances the timing,
> which makes the power..
> with advanced timing, the combustion chamber temp
> increases (greater
> opportunity for pre-ignition (ping)) which is why
> higher octane gas is
> required (higher octange rating means the gas is
> harder to ignite)
>
> >
> > But, now that I have the MP comp all I'm hearing
> is that cold plugs are
> bad
> > and will lead my engine to an early death because
> the plugs won't cure the
> > ping, whether I can actually hear it or not.
> Everyone is saying to ditch
> the
> > plugs and put higher octane gas in the tank.
>
> I say keep the plugs, run the higher octane gas.
> plugs being the only
> option.
>
> >
> > Folks, I'm getting as tired of this thread as you
> are and aside from
> sending
> > a "Thank you" message to all who made worthwhile
> contributions when it's
> > over I still haven't seen a single post that says
> why higher octane is
> > needed and colder plugs are bad. The only thing I
> have heard is "Welcome
>
> It would be a shame to end this thread until you
> learn WHY using lower
> octane gas is not good with the MP comp. The DML is
> here for sharing
> knowledge.
>
> to
> > the fried piston club", "Mopar says you need to
> run 92 octane", "We know
> > what we're talking about". I don't doubt any of
> these things except for
> one
> > thing. No one has yet said WHY this is.
>
> I've tried to explain why to the best of my
> abilities, the only other reason
> I can offer is that I've been down that road, still
> on that road, and I know
> the results from using lower octane gas.
>
> >
> >
> > John
> >
> > >If you sustitute a colder plug for octane, you'll
> probably notice
> decreased
> > >gas milage as well as an overall sluggish
> feel.... Try driving the
> truck
> > >with
> > >each setup, then you'll see why they say to
> switch gas, and not plugs.
> >
>
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This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:53:49 EDT