RN12Y vs. RN14Y Plugs
Bob Lyle
The owner's manual from the 1983 Plymouth Horizon I'm working on says it
was originally equipped with RN12Y plugs, while the local parts house
cross-reference says Champion RN14Y's are the proper substitute up to 1984
for the 2.2L non-turbo SOHC.
What if any difference will this make? Is the number designation referring
to the temperature range of the plug, one being better suited to highway
driving and the other to stop and go with lots of idling? The car is used
for mixed driving in well below to slightly above freezing conditions at
speeds up to 60 MPH and 40-50 miles of use daily.
Thanks for any input!
«Bob»
Dennis Wayne Scott
I have pretty much the same questions! I bought new plugs today and the
parts store says to use Champion RV15YC4 while my manual says to go with
the RV12YC. I suspect the difference is the temperature that each will
run at...
Right now I'm using a year and a half old RV12s at the proper gap for my
1987 Chevy S10 2.8L V6 and I get this terrible vibrating (knocking?) at
about 35 mph if I accelerate slowly. Any idea if this is due to the plugs
not running at the right temp? Or is it just a ten year old engine?
--
Dennis W. Scott, Jr.
University of Illinois at Urbana dsc...@coewl.cen.uiuc.edu
----------------------------------------------------------------
Aspiring Electrical Engineer "I want to know God's thoughts...
Cesar Jeffery Bugarin Balmes
That knocking sound.... so about how much mileage does this
engine have on it? 2.8's are known to blow around 60+k, and
that knocking sound sounds like an engine ready to go. I know
my old blazer did, and so did about 7 other people I know too.
Sell it now , and buy something that doesn't have a 2.8L in
it - while you can :).
Dennis Wayne Scott
The truck has 100K on it... it's an '87. I only knocks at
around 35 mph, and only if I'm accelerating slowly. Is this
consistent with the blown engines you've heard of?
leep
In article <5d38c0$i...@vixen.cso.uiuc.edu>, dsc...@coewl.cen.uiuc.edu (Dennis Wayne Scott) says:
>
>I have pretty much the same questions! I bought new plugs today and the
>parts store says to use Champion RV15YC4 while my manual says to go with
>the RV12YC. I suspect the difference is the temperature that each will
>run at...
>
>Right now I'm using a year and a half old RV12s at the proper gap for my
>1987 Chevy S10 2.8L V6 and I get this terrible vibrating (knocking?) at
>about 35 mph if I accelerate slowly. Any idea if this is due to the plugs
>not running at the right temp? Or is it just a ten year old engine?
>
>
>Dennis W. Scott, Jr.
>University of Illinois at Urbana dsc...@coewl.cen.uiuc.edu
> ----------------------------------------------------------------
>Aspiring Electrical Engineer "I want to know God's thoughts...
MUCH longer. 14Y is a slightly higher heat range --no huge difference.
18Y used to be the highest range. LEE
Clarence Snyder
dsc...@coewl.cen.uiuc.edu (Dennis Wayne Scott) wrote:
>Cesar Jeffery Bugarin Balmes <dasu...@hotmail.com> writes:
>
>> That knocking sound.... so about how much mileage does this
>>engine have on it? 2.8's are known to blow around 60+k, and
>>that knocking sound sounds like an engine ready to go. I know
>>my old blazer did, and so did about 7 other people I know too.
>> Sell it now , and buy something that doesn't have a 2.8L in
>>it - while you can :).
>
>The truck has 100K on it... it's an '87. I only knocks at
>around 35 mph, and only if I'm accelerating slowly. Is this
>consistent with the blown engines you've heard of?
>
>--
You have the typical GM part throttle ping. If you run high-test it
will likely go away. The cause could be your EGR system being
inoperative, or bad timing advance. You could also have a carbon
buildup, but usually that shows up under heavier loads.
As for the 2.8, it is definitely not my favourite engine, but then nor
is any GM. They had their problems, but many were caused by extended
maintenance intervals, and putting more trust in GM's engineering than
it warrants. Err on the side of over maintaining, and they CAN last a
long time. I will not go as far as to say they WILL.
>Dennis W. Scott, Jr.
>University of Illinois at Urbana dsc...@coewl.cen.uiuc.edu
> ----------------------------------------------------------------
>Aspiring Electrical Engineer "I want to know God's thoughts...
Snyder Enterprises
Appropriate Technology for the Information Age.
Waterloo, Ontario
Clarence Snyder
"Bob Lyle" <bl...@inforamp.net> wrote:
>The owner's manual from the 1983 Plymouth Horizon I'm working on says it
>was originally equipped with RN12Y plugs, while the local parts house
>cross-reference says Champion RN14Y's are the proper substitute up to 1984
>for the 2.2L non-turbo SOHC.
The original in 83 was the RN12Y. The replacement is the RN14YC. The C
designates a copper core center electrode which gives a wider
temperature range than the Y. The Y is an extended tip plug with a
wider temp range than a straight RN12. The R means resistor, for RFI
suppression, and the N means 14MM long thread flug format.
The 14Yc will heat up quicker than the 12Y, yet run cooler under load
than a 14Y. With older plugs, you are spanning from about an 11 to a
14 in this one plug.
>
>What if any difference will this make? Is the number designation referring
>to the temperature range of the plug, one being better suited to highway
>driving and the other to stop and go with lots of idling? The car is used
>for mixed driving in well below to slightly above freezing conditions at
>speeds up to 60 MPH and 40-50 miles of use daily.
>
>Thanks for any input!
>
>«Bob»
>
>bl...@inforamp.net
Snyder Enterprises