Why does my 26 T have adapters that the spark plug screws into? The plugs screw into what looks like a adapter but i dont know why??? Was going to ask before. I am still new to model T s. Thanks for the info in advance! Tim
The stock Model T plug uses 1/2 inch NPT pipe thread. The adapters are available for those who want to run modern 14mm plugs in their Model T heads.
Mark, do the newer style plugs function any better the the two piece plugs? Thanks Tim
I haven't tried the adapters with modern plugs, so I can't say. I currently run Edison #14 1/2 inch NPT plugs in my 1924 and am happy with them. Can others comment on their experiences?
Where is anyone buying the d originals ebay and swap meets? I would prefer the original looking plugs. Tim
I use adaptors in aluminium heads so that the 1/2" pipe thread in the heads is not compromised with repeated removal and replacement of plugs. Just playing safe. It also makes a wider range of plugs available.
Allan from down under.
The answers are yes, yes, and yes. That's eBay, swap meets, and auctions. Old plugs typically are $2 to $7. The most common and popular are Champion X, but there are many others. http://www.mtfca.com/discus/messages/599638/644598.html?1464032597
There are also new plugs for Model T engines. Champion still makes the X plugs, which cost many times what the old ones will cost you (often north of $30 each). Modern plugs much less costly are Autolite 3095 and Motorcraft F-11. I'm currently trying the Autolites, and so far so good.
Steve, thanks I didn't have any idea of the choices other than the champion x. I would like to use something more affordable while I am doing more work than driving. I like the look of the champions old style plug. Thanks Tim
I Like the Motorcraft T plugs. They seem to work fine for me. So for so good and they are a Ford product!
You can buy 8 or so of the Autolite or Motorcraft plugs for what you may have to pay for 1 new Champion X.
Having a spare adapter around is also handy if you use a modern compression tester/gauge which has fittings for the more modern sized spark plugs....
It's possible that the adapters have been fitted because of crook original threads in the head, something to watch for.
The problem I had with automate and motorcraft is they foul out easily.
My last T I put appox 8k mile on it around town and trips and never had a plug out with X's.
Adapters are good and I have run them. But I used a Bosch 409 plug this had a good heat range and long reach but never looked right
Been working on trying get a match set of 4 old plugs for the current T
I'm running the Motorcraft F-11's in mine for 4yrs now and pulled them a couple of days ago and they look just like they did when I put them in. I'm guessing I put about 3,000mi a year on them, still going great, Don.