Tip design also comes into play on detonation...that's already been proven
and discussed (numerous times) on the DML and other related forums.
The main reason for going with the 3923's (or 3924's) is for detonation and
slightly more power overall (and yes, the standard tip plugs do make a
little bit more power over the Extended "Special Power-Tip" plugs).
Jon Smith can vouch for that one...old dyno sheets his website (and many
others have found the same).
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
david.clement@verizon.net
Sent: Sunday, February 22, 2004 8:46 AM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: Re: DML: Re: Autolites & gas mileage
The heat range of the plug has nothing to do with the fuel mixture or the
overall temperature the engine runs at. The heat range rating is a measure
of how fast the tip of the plug cools off after ignition. If it cools to
fast then you get crap build up on the tip and fouling, resulting in miss
fires. If the plug does not cool down quick enough then it can/does cause
detonation (i.e., pinging).
You can visually see the difference in construction between a hot plug and a
cold plug. The ceramic insulator on the center electrode will go further
down into the body of the plug before making contact with the metal housing
of the plug on a hot plug compared to a cold plug. This results in it taking
longer for the heat build up in the tip to disapate into the head of the
engine.
The only reason to put a 3923 plug into your engine is if you have been
having detonation problems. Getting reduced fuel mileage would be an
indication that the plug may be fouling resulting in a slight miss fire. I
would go back to a stock heat range.
Dave Clement
99 SLT+ CC 4x4
In article <BAY11-DAV128UR6xW290003ef3c@hotmail.com>, hemidak@msn.com ("Chad
Evans") writes:
>
>
> 3923's are one range colder. colder = more fuel ? better for
> performance.
>
>
> ----- Original Message -----
> From: "Jay & Dana" <jay&dana@telus.net>
> To: "DML" <dakota-truck@dakota-truck.net>
> Sent: Friday, February 20, 2004 6:49 PM
> Subject: DML: Autolites & gas mileage
>
>
> >
> > I know the majority here on the DML use the Autolite 3923's but I'm
> > wondering if anyone has experienced an increase or decrease in fuel
> > mileage since switching over to these plugs from the stock ones? On
> > my 97, 318 it seems the gas mileage has gone down slightly since
> > using these plugs.
> >
> > Jay
> >
> >
This archive was generated by hypermail 2b29 : Mon Mar 01 2004 - 00:34:04 EST