There are several factors on why to run colder plugs:
Supercharger, Turbo Charger, Nitrous, extended highway driving (or racing),
but the main factor for us seems to be "Pinging". Having an upgraded
ignition system helps out in most cases but doesn't constitute a colder plug
(although it doesn't hurt). For emissions, the colder plug may (but highly
doubt) cause higher levels of pollution but I haven't ever seen that in the
past actually happening.
The best suggestion I can give you is try them. They're about a buck each
and if you don't like them, you're not out a whole lot of money.
(I normally run SplitFires but the colder range plugs are harder to find so
I tried the 3923's...I've been running with them now for almost 6 months and
I like them...Granted, I change them more often, but that's just due to the
Nitrous usage.)
- Bernd
----- Original Message -----
From: "Charles Wyman" <cewyma@Roushind.com>
To: <dakota-truck@buffnet.net>
Sent: Monday, July 10, 2000 11:23 AM
Subject: Re: DML: Re: Autolite #'s?????
> What are the pros and cons of running colder plugs? Does having an
upgraded ignition system, such as a MSD, cause the plugs to run hotter or
colder?
>
> -----------------------------
>
> Date: Mon, 10 Jul 2000 09:44:59 -0500
> From: "Bernd D. Ratsch" <bernd@texas.net>
> Subject: DML: Re: Autolite #'s?????
>
> The difference between the 5224 and 3923 plug is #1, Heat Range (3923 is
one
> step colder) and #2, the tip on the 5224 is a "Special Power Tip". (Just
an
> extended tip...i've watched for any types of problems when running the
> 3923's and haven't found anything yet. The difference between the 3924
and
> 3923 is the heat range...nothing else. The 3924 is the stock heat range
and
> the 3923 is one step colder.
>
> - - Bernd
>
> - ----- Original Message -----
> From: "Greig, Doug" <douggr@hazelett.com>
> To: <dakota-truck@buffnet.net>
> Sent: Monday, July 10, 2000 9:20 AM
> Subject: DML: Autolite #'s?????
>
>
> > I think I thoroughly confused myself this weekend. I went to the parts
> > store to pick up some autolite 3923's for my V6. I didn't see any 3923's
> at
> > all, and when I asked, I was told they didn't have that #, but they had
> > 3924's. Being cautious, I checked the Autolite manual for the correct #
> for
> > my truck. It said #5224 was the # I needed! WTF? I even held the 3924
next
> > to the 5224. The 5224's were longer, but appeareed to be the same width.
> "So
> > what do I do now?" I asked myself. If I buy the 5224, and they are too
> long,
> > do I take a chance on cracking them on top of a piston? Are the 3924's
the
> > same as the 3923's? I just didn't know what the difference was between
> them.
> > So I gambled and bought the 3924's and installed them Saturday. I
compared
> > them too the Bosch +4's I had in there(what a piece of dung!) and they
> > appeared to be the same size(phew!). The truck feels much better. I
> couldn't
> > believe the size difference of the electrodes between the two spark
plugs.
> > The +4's were so small, I can't believe I trusted them like I did. My
> > question is , why are we using 3924/3's when the book say to use 5224's?
> > What is the difference between the 3923 and the 3924 plug?
>
>
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