Re: [Chrysler300] 300-F Plug reccomendations

["C Bilter" <cbilter@xxxxxxxxx>]

Champions were not original equipment spark plugs for letter cars until the ‘63 300J.  Prior to ‘63 Auto-Lite plugs were used.  The original equipment spark plugs on the F &G were the Autolite A32 which are no longer made.  The modern day equivalent is “roughly” the Autolite 85.   The equivalent Champion is J12YC or RJ12YC.   The heat range on both these plugs is right in the middle between hot & cold.  The problem is one cannot absolutely compare the heat range of one manufacturer to another, and all manufacturers simply specify a range from hot to cold without any absolute values; it is simply a relative measurement.  Furthermore, with today’s gas in the USA, a colder range plug is sometimes necessary to prevent detonation (“pinging”).   Ethanol gas tends to make matters worse.  The goal is to use the coldest range plug possible without fouling the plugs.  

To that end Tony Rinaldi’s discussion in prior posts about using NGK racing plugs has much merit.  NGK offers colder range plugs and they do not foul up.  I’ve been using the NGK 7 series in my J this year so far with excellent results.  The NGK equivalent heat range of the Auto-Lite 85 and Champion RJ12YC would be NGK 5 series; so I’m running two heat ranges lower on my J.  Previously using Champ RJ12YCs gave me nothing but detonation.  The original factory plug on the J was a Champion J9Y so it was quite a cold range plug.  The F & G in stock form might do fine on an NGK 6 series plug.  With a rebuilt engine (no carbon buildup) the Autolite 85 might do fine as well.  Champion plugs these days, IMHO, aren’t what they used to be years ago.

300Jly,
Carl B

From: Richard Osborne 
Sent: Sunday, August 11, 2013 7:29 AM
To: David Schwandt 
Cc: mailto:Chrysler300@xxxxxxxxxxxxxxx 
Subject: Re: [Chrysler300] 300-F Plug reccomendations

  
Hi David, I believe the "pipe cleaners" are the side seals for the rear seal retainer. They may need trimmed if I remember correctly. 

I know I'll get static for this, but.... Champions were original equip for Mopars. I have always had best luck with them, even though, to my knowledge, the original heat ranges are no longer available. As a side note to this, be aware that the computer system at Auto Zone has the wrong part number in their system. I have advised a personal friend who is a District Manager, but who knows if it'll get fixed. You'll want RJ12YC, NOT the RN12YC which is a small block Mopar plug. I know this because I bought a set for the G a few days ago. And , yes, I am a geek for remembering some of this nonsense. 

Back off to the races with my son.

Richard

Sent from my iPhone

On Aug 10, 2013, at 9:24 PM, David Schwandt <mailto:finsruskw%40iowatelecom.net> wrote:

> Well the F is going back together. Got the short block pretty well put
> together except for the rear
> 
> Main seal retainer and pan. Darn gasket kit had no side seals for the
> retainer, just a couple short pieces of pipe cleaner!!
> 
> WTH is THAT for???
> 
> Wondering what you F and G owners are running for spark plugs these days.
> 
> When it 1st went together back in '84 I ran Champion Platinum Plus and
> witched to
> 
> Autolite P85's somewhere along the line.
> 
> What say you guys??
> 
> Dave Schwandt
> 
> [Non-text portions of this message have been removed]
> 
> 

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