> 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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