Spark plug heat ratings
Brian Morgan
can never rember whether the numbers go up or down...
I am using Champion RN11YC plugs, and would like to go 1 step cooler.
The auto shops around here are USELESS and are unable to tell me. I had
one guy tell me that the reason they don't stock brake pads for my vehicle
was that there aren't very many of them around - I have a Dodge Caravan...
Anyway, thanks for the help!
Brian
brian....@sdrc.com
Gordon R. Kennedy
: I would like to lower the heat rating on my spark plugs by 1 step, and I
I spent about 10 years on the other side of a parts counter (when younger)
and this situation came up all the time. I never had much trouble with
such questions, but ...
Anyway, Champion plugs (for the most part) get "hotter" as the number
goes up. So, in your case, look for RN10YC plugs (were common at 1 time).
Now the bigger (?) question is whether you wish to use plugs which dissipate
more heat (as in "colder" above) or plugs which are more suited to a colder
running engine (usually referred to as a "hotter" plug).
Hope this helps a bit ... Gord
.
Frank Mallory
BM> I
BM> can never rember whether the numbers go up or down...
BM> I am using Champion RN11YC plugs, and would like to go 1 step cooler.
BM> The auto shops around here are USELESS and are unable to tell me. I
The N9Y would be not as hot (I still wouldn't call it a "cold" plug).
And if you can find someone who is knowledgable about your particular engine,
you might find out whether your ignition system really requires resistor plugs;
otherwise, unless they introduce a lot of interference with your radio
reception, I would switch to non-resistor plugs.
george
:one guy tell me that the reason they don't stock brake pads for my vehicle
:was that there aren't very many of them around - I have a Dodge Caravan...
the best was when the guy gave me the old "go to a dealer" - I was after
a part for an mg... ( this about a year ago )
--
/ george jefferson
\/ * geo...@mech.seas.upenn.edu
Brian Morgan
>Brian Morgan (namo...@sgi4.sdrc.com) wrote:
>: I would like to lower the heat rating on my spark plugs by 1 step, and I
>: can never rember whether the numbers go up or down...
>: I am using Champion RN11YC plugs, and would like to go 1 step cooler.
>
>goes up. So, in your case, look for RN10YC plugs (were common at 1 time).
>
>Now the bigger (?) question is whether you wish to use plugs which dissipate
>more heat (as in "colder" above) or plugs which are more suited to a colder
>running engine (usually referred to as a "hotter" plug).
>
>Hope this helps a bit ... Gord
>.
Thanks for the response. What I'm trying to do is eliminate a spark knock
that won't go away with proper timing, etc. My wife took the van (Caravan)
to a dealer while I was out of the country for some work. They installed
RN11YC plugs (which is what the guides in the parts places list). The
underhood sticker lists RN12YC as the plug to use. The dealers mechanics are
idiots and can't seem to fix anything, so I'm doing it myself. To reduce
spark knock, my thought was to reduce the heat rating on the plugs. But
they have already installed cooler plugs (11's instead of 12's).
Any suggestions?
Thanks!
--
Brian Morgan
brian....@sdrc.com
KENNETH MACALPINE
To go one step colder from a Champion RN11YC would be to use a RN10YC. I
have never seen this plug type used before, but it might exist. If you
can find an auto parts store that has a Champion, NGK, or Bosch
sparkplug catalogs, it will tell you the meaning of the various
alfanumeric designations. You might be able to find a colder plug in
another brand.
For Champion, R stands for a resistor type plug, N is the thread type, 11 is
the heat range, Y is the type of electrode tip, and C designates a copper
core. The key to the designations codes is usually found in the begining of
the catalog. Why do you want a colder plug, detonation problems?
Ken
Alan Horowitz
But some poor sucker, trying to get a decent s/n on an AM signal (eg,
aircraft) might get creamed by the broadband interference you'll put out
from non-resistive wires. It's your decision.
--
Alan Horowitz
al...@wyvern.com
Frank Mallory
AH> signal.
AH> But some poor sucker, trying to get a decent s/n on an AM signal (eg,
AH> aircraft) might get creamed by the broadband interference you'll put
AH> out
AH> from non-resistive wires. It's your decision.
But if you connect some good ground straps between the hood and body of your
car, you can be almost certain of avoiding that.