Spark Plugs for 8N

[GLMPA]

What current spark plugs recommended for 1948 Ford 8N? Thanks

 

[old]

NGK3112

 

[Bruce (VA)]

See tip # 7.

NGK 3112 plugs work well too.
75 Tips

 

[John in Mich]

I have used AL437s for years.

 

[Kid Shileen]

Another vote for the AL 437

 

[old]

I did also till they started being made in China and then I switch to the NGK since the auto lite don't hold up any more

 

[old]

China junk now

 

[Tim PloughNman Daley]

FORD TRACTOR OEM SPEC for the spark plug was/is the 14mm CHAMPION H-10. Later, CHAMPION developed a hotter plug, the H-12. About the same time AUTO-LITE introduced their 437 plug. Both work equally well on these old FORDS. CHAMPION is made in Mexico now. AUTO-LITE is now made in New Zealand and parent company is the FRAM GROUP. Prior to 2011 AUTO-LITE was owned by the Honeywell Corp. NGK has always been a Japanese corporation. They now boast of a 'new patented ruthenium technology' that provides high performance on engines. Not sure what that is nor if a hi-tech plug is needed on these old N's but whatever blows your skirt up. I hear guys claim one brand is better than another but yet have never seen any actual data to support that claim. It is all based on opinions. How does one gauge plug performance? But, the adage goes, it's your tractor and your money so do whatever you want. I use the H-12, now the Champion 512 plug, or the Auto-Lite 437, now the 216 plug with no issues at all. I get whichever my local auto parts store has in stock. FWIW & FYI: 14mm is the size of the spark plug thread. 14mm x 1.25mm to be exact. That's .5512 x .0492 equivalent so you won't find a tap size in an Inch Format if you are looking to chase the head ports. The 14mm plug uses a 13/16 AF (Across Flats) Hex Head Size. Always use your air gun to blow out the plug wells before removing the plugs so debris doesn't fall inside when removing.


Tim Daley(MI)

 

[Lynn Patrick]

"I did also till they started being made in China and then I switch to the NGK since the auto lite don't hold up any more"
I agree w/old.

 

[deanostoybox]

Champion H10 crosses to Autolite 216 and to NGK B-6L (3212)
Champion H12 crosses to Autolite 437 and to NGK B-4L (3112)

If you work the tractor hard you will not notice a difference in performance.
If you idle a lot and just putter around you may like the 'hotter' H12, AL437, B-4L better.

Cannot speak to Champion as I quit using them in the mid '70s.
Upside to Autolite is you can find them most anywhere.
Downside to Autolite is they like to get rusty.
Upside to NGK is they don't rust very well.
Downside (at least around here) is no one stocks them, always special order.

The numbers in parenthesis after the NGK part number is the stock number. That is the number you use to order them.

 

[John in Mich]

I'll have to look at the new ones that I have on the shelf. They have been there for several years.