AMC Eagle Den Forum

The Mighty 258 => Engine Electrical Systems. => Topic started by: Sandeagle on December 23, 2015, 01:53:54 PM

Title: Spark plugs
Post by: Sandeagle on December 23, 2015, 01:53:54 PM
After reading a bunch of stuff on this site I can never find what I am looking for. I just ordered a D.U.I. From 4 wheel drive parts, a recommended D.U.I. And the 8MM wires. I remember reading somewhere that some plugs are terrible. What are recommended spark plugs. Good plugs!!  Buy once cry once. Already have the 2150 m/c.
Title: Re: Spark plugs
Post by: rommel1940 on December 23, 2015, 02:05:55 PM
When I did the big cap/coil swap I bought new autolite copper plugs and the car ran like crap,
I put back in the champion platuim plugs and it runs great, there like 5 bucks each but I recommend the champion platinum plugs
Title: Re: Spark plugs
Post by: Sandeagle on December 23, 2015, 02:18:33 PM
Thank you,I think your post was the one I was looking for. 
Title: Re: Spark plugs
Post by: eaglefreek on December 23, 2015, 02:24:36 PM
I prefer standard copper NGK's myself.
Title: Re: Spark plugs
Post by: JayRamb on December 23, 2015, 02:26:24 PM
Champion or Autolite work great for me, gapped .35
Title: Re: Spark plugs
Post by: macdude443 on December 23, 2015, 02:34:11 PM
I've run the Champion Copper in mine and the NGK Copper that Eaglefreek mentioned.  No problems.  Stock gap is .35, post-HEI gap is a suggested .45.
Title: Re: Spark plugs
Post by: mo.eagles on December 23, 2015, 05:13:43 PM
I've been changing spark plugs for 30 years and I prefer in this order Champion ,NGK OR Bosch ,Denso. I've never had autolite or ac delco last for very long.
Title: Re: Spark plugs
Post by: mudkicker715 on December 23, 2015, 08:58:15 PM
My msd ignition runs autolites gapped at .45. Never a problem very good fire with them. My stroker turns the tires in 3rd sr4 manual with 2.73's on my sedan.
Title: Re: Spark plugs
Post by: Sandeagle on December 25, 2015, 12:15:54 PM
Thanks everyone, gonna order both champ.and NGK and will let you know which runs better. Copper seems to be the trick. I am running champions now.
Title: Re: Spark plugs
Post by: carnuck on January 06, 2016, 01:00:52 AM
Unless the plugs were dropped or something, the Autolites should be fine with the correct gap. (there were 2 completely different ranges for our AMC 6 cyls, depending on emission equipment and head design)

I still like the NGK 2288s the best (BKR6EK) which are double grounds and idle without a miss with my HEI and stock carb.
Title: Re: Spark plugs
Post by: 86AMCEAGLE on May 12, 2017, 12:02:40 PM
Copper conducts better, Platinum and Iridium last last longer.
Title: Re: Spark plugs
Post by: AMC1 on May 13, 2017, 04:30:24 PM
I've always had good performance with Champion & I'm probably the only who uses a torque wrench to torque the tapered plug to 11 ft./ lbs. The only plug I never liked was AC.
Title: Re: Spark plugs
Post by: bradd04 on July 12, 2017, 04:51:48 AM
I personally like the performance and longevity of NGK.