Mike,
I'm I misunderstanding something here? I thought I understood all that tech
stuff from the NGK site. The NGK site states:
"The spark plug has two primary functions:
To ignite the air/fuel mixture
To remove heat from the combustion chamber
...It is important to remember that spark plugs do not create heat, they can
only remove heat. The spark plug works as a heat exchanger by pulling
unwanted thermal energy away from the combustion chamber, and transferring
the heat to the engine's cooling system. The heat range is defined as a
plug's ability to dissipate heat.
...A spark plug's heat range has no relationship to the actual voltage
transferred though the spark plug. Rather, the heat range is a measure of
the spark plug's ability to remove heat from the combustion chamber. The
heat range measurement is determined by several factors; the length of the
ceramic center insulator nose and its' ability to absorb and transfer
combustion heat, the material composition of the insulator and center
electrode material."
Oh shit! I was just looking at the site to confirm what I thought I
understood. I had it backwards. The 6 will take more heat out of the
chamber. The NGK site does confirm that a plug's job is to dissipate heat
though.
The full article is here:
http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp2.asp
I guess I was half right. I'm trying here.
Later,
Jason Bosaw
Co-webmaster
The Sentra Network
http://www.sentra.net
----- Original Message -----
From: "mike kojima" <[EMAIL PROTECTED]>
To: "Sentra Mailing List" <[EMAIL PROTECTED]>
Sent: Sunday, May 20, 2001 11:07 AM
Subject: Re: SML-NON-P: spark plugs
> No way Jason, a 6 heat range plug is colder, the plugs
> have nothing to do with taking heat out of the
> chamber, the colder the plug the colder the electrodes
> run and the less likly they are to glow red hot and
> start detonation or burn up under hard driving
> conditions.
>
> 5 heat range plugs are ok for regular driving but fast
> driving or track driving requires 6 heat range. 6
> heat range is fine for normal driving also. It is the
> spec plug for europe and Japan. Anytime you replace
> your plugs use PFR6G-11 or PFR6B-11 which is basicaly
> the same plug.
>
> 6's are far less likely to cause detonation that 5's
> not the other way around.
>
> Mike
> --- Jason Bosaw <[EMAIL PROTECTED]> wrote:
> > Well I wouldn't say Hot and Cold. I would just say
> > that a 5 is hotter than a
> > 6 or a 6 is colder than a 5. I have experimented
> > with the PFR6B's in my car
> > and they're a little too cold for me. They don't
> > take enough heat out of the
> > combustion chamber and cause some pre-ignition.
> > That's with advanced timing
> > too. You should be able to play around with the heat
> > ranges to find out
> > which one works best. See the tech section on
> > sparkplugs.
>
>
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