Stopped at my local NAPA today to pick up some of the recommended Champion N18Y spark plugs. (not because of oil burning, just because it is so darn cold here and I do a lot of in-town driving) They told me that such a plug did not exist. I looked up the stock plug and it is RN14YC but cannot find anything like a RN18YC. Does anyone know whether you can still get the 18's? Or does anyone have a recommendation for an equivalent plug to the 18 in a different brand? Seems like my suggestion to cross-reference went right past the parts guy. Thanks for your help.

I dont know offhand, but is perhaps going to your local Chrysler dealer/service out of the question? (i find it funny as heck to go in and ask for parts that are older than i am, and whatch the parts guy squirm and hunt thru some damned old books)

you may as well stick with the n14 unless you really need a hotter plug. a good rule of thumb when considering plugs for a stock motor- use the brand and heat range that the factory called for in the first place. if you have a modified motor i would think you would want a colder plug for performance. direct connection always called for 340 plugs (n9y) in a slant for hp use with high compression and advanced ignition.

-james

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Seem like the N12Y is currently the hottest plug Champion still carries.
N14Y and anything hotter have been discontinued.
(Correction: I just got some N14Y from my local Kregans, I asked for plugs for a 72 Dodge Dart 225 and they gave me the 14Y heat range)
Keep your eye out at swap meets, you can still find the hotter plugs floating around the meets.
DD

Doug,
Speaking of spark plugs what would be your recommendation for use with a turbo (stock engine with 6-10 lbs of boost)?
Bob D

I have been forced back into "plug experimentation" with using NOS.
I know that the 340 plugs are much colder so I would try some N10Y or N9Y, then adjust up or down based on what color you see after running on boost.
DD

FYI, I gave up on Champion plugs in the 80s when I had my shop. A lot of the slants developed a high speed miss with them. The best plug I fould was the Autolite (56), and that is what I still use (currently in my turbo Dart).

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Chuck Rivers, Webmaster

I have had good luck with NGK plugs, I think the colder ones are BP5ES
DD

BTW, the numbers on the new set of Champions is RN14YC and item # 405. This is their "Copper Plus" plug and I got them for .99 (cents) each.

Got to agree with Chuck here. I don't know how many times I complained to my mechanic buddy who came over, replaced the BRAND NEW champions with ACs and it ran great.

i fell for thet "splitfire" b.s. when they came out. they would gas foul weekly. i got tired of pulling and cleaning them, then playing with the carb and ignition. the old champions i had taken out fixed the problem. they were n9y "340" plugs. they never skipped a beat.


-james

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An old buddy of mine whom I used to windsurf with put some Splitfires in his old Chevy Astro and loved 'em. I've never used 'em myself, but it seems to me that they're more for larger vans/trucks than cars being tuned for performance.

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

383/400's during demo derby seasons, they worked great until the battery ran low on juice, at least the tips never melted off like Autolites when things got too hot...on the other hand a friend put plit fires in his snowmobile and ended up with a hole in a piston...

I run NGK's in my car.

-D.Idiot

I run NGK GR4s or GR45s in my cars. Crossover from the Champion RN12/14YC or Autolite 65/66.

Lou

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Home of Slant6-powered fun machines since 1988

I know NGK runs their numbers backwards, so wouldn't a 5 be hotter? All of the NGK's that I ever use are 7's or 8's, and the seven is the hotter of the two. (Now the 8 will get jealous...)

Yes, they are "backwards", so the 4 is hotter. I have run the colder GR5s too, but they are hard to find and I didn't see any difference.

Lou

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Home of Slant6-powered fun machines since 1988