RE: [Chrysler300] Spark Plugs

["C Bilter" <cbilter@xxxxxxxxx>]

I believe that Champion either changed their spark plug numbering system or
their recommended plug type sometime prior to 1979 and so current plug types
differ from what is listed in the FSM.  What used to be J12Y became J14Y and
what used to be XJ12Y became RJ14Y. These would be used on New Yorkers,
Imperials etc. The J10Y or XJ10Y specified for the 413 high performance
engines in the letter cars became RJ11Y.  This information is from a
Champion publication I have from 1979.

 

Carl Bilter

  _____  

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Ronald Kurtz
Sent: Friday, February 18, 2011 3:36 PM
To: Jonny Mattsson
Cc: chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Spark Plugs

 

  

Hi, Jonny:

Can you be more specific about the year and application of your 413?  

According to my files, A42 is equivalent to a Champion J12Y (the lower the 
Champion number the cooler the plug, it's ability to transfer heat resulting

from combustion to the cylinder head quicker than a "hotter" plug. Cooler
plugs 
are used in high performance engines.) 

Champion specs for a 413 list a RJ14Y for standard applications and a RJ11Y
for 
high performance applications. A J10Y or A32 is recommended for a 1959 300E.

For your info:

R = Resistor plug
J = First prefix letter for thread size - thread reach (3/8 inch) and hex
size 
( 13/16 inch)
14 = Heat Range
Y = Gap style - protruding nose

Since R,J and Y are given for a 413, the heat range is determined by 
application. If you run your 300 frequently at high speeds, a cooler plug is

recommended. If you drive the car occasionally, I would suggest a hotter
plug.

Please advise the year, car and carburation: 1 or 2 4-barrel carburators.
Maybe 
we can zero in on the right heat range for you.

Other, more experienced club members may have additional or better
information.

Best regards,
Ron Kurtz
E# 292 

________________________________
From: Jonny Mattsson jonny.mattsson@xxxxxxxxxxx
<mailto:jonny.mattsson%40hotmail.com>  quicker 
To: chrysler300@xxxxxxxxxxxxxxx <mailto:chrysler300%40yahoogroups.com> 
Sent: Fri, February 18, 2011 3:01:50 PM
Subject: [Chrysler300] Spark Plugs

  

Hi group,
Some time ago,spark plugs questions has been asked,guess I delete them.
However,the 413 engine specifications says Auto-Lite A-32 or Champion J-12Y.
I have a package of Auto-Lite A-42. Can I use them? or what is your choice 
today.

Jonny Mattsson
Sweden

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