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Old 05-16-2010, 06:11 AM   #1 (permalink)
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Default Champion RN11YCC

I can't find any information about this plug, but it's the part number out of my hand book. I can get the following 3 plugs at NAPA what is the best path to take?
RC12YC~Cooper Plus
3071~Single Platinum
RC11PYPB4~Double Platinum.

Thanks in advance.
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Old 05-16-2010, 06:50 AM   #2 (permalink)
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Either the Champion double platinum or the Bosh Platinum Plus 4, 4418.
By the way, how many miles on the engine, will you be throwing a set of 8 mm wires on?
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Old 05-16-2010, 07:49 AM   #3 (permalink)
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Champion number 318, cheap, easy to find and work well in DIIs.
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Old 05-16-2010, 08:36 AM   #4 (permalink)
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Quote:
Originally Posted by Disco Mike View Post
Either the Champion double platinum or the Bosh Platinum Plus 4, 4418.
By the way, how many miles on the engine, will you be throwing a set of 8 mm wires on?
Hey Mike,
106K on the clock and I have already installed a set 8mm Magnacor's about a year ago. I replaced the factory champs at 80k with a set of NGK iriduim's but have not been very pleased as the motor still had a slight mis. I went with the Champion double platinum's this morning and the motor smoothed right out. I'm a little shocked with the ngk plugs as I have used them several times in the past with good results. I even used them in my wife's merc twin spark. thanks for the replies, the plugs were $5.39each at NAPA.
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Old 05-16-2010, 09:11 AM   #5 (permalink)
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After nearly 70,000 miles on my Plus 4's, I switched to Bosh Fushions while doing the head gaskets and I was not as pleased with them either, lost some low end puch that I had grown used to with the PLus 4's.
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Old 05-16-2010, 10:02 AM   #6 (permalink)
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Quote:
Originally Posted by PTSchram View Post
Champion number 318, cheap, easy to find and work well in DIIs.
What he said.
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Old 05-16-2010, 05:17 PM   #7 (permalink)
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Quote:
Originally Posted by Disco Mike View Post
After nearly 70,000 miles on my Plus 4's, I switched to Bosh Fushions while doing the head gaskets and I was not as pleased with them either, lost some low end puch that I had grown used to with the PLus 4's.
Well at at fisrt listen the mis was gone but after driving for a bit it's back only at idle. The new plugs perform better but still a mis at idle... Not sure what to do now. I can appreciate everyones opinon on the standard plugs but what I was looking for was long life. I have worked for NGK Spark Plugs USA for 14 years and the platinum and iridum plugs are a better option for 80~100k miles of service. The standard copper core start to fail during testing at 30k. Anyway no codes and going on vac. in a month any advice on where to check next? Also I use seafoam twice a year and the LR fuel treatment at every oil change 3k 15-40 Rotella K&N 3001hp. Thanks guys!!!
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