What is the correct spark plug number for my 24 TT. Mine currently has Motorcraft F11 plugs. I am going to put a set of new plugs in and just need to know if these are the correct ones? Gap set at .035"?? Thanks
Those Motorcraft plugs are cold and foul easily. Champio X plugs are much hotter and do not foul easily or at all in most cases.
Original used ones can be found on eBay for $3 - $5 if you are patient. They can be disassembled and cleaned for as long as you own them.
Don't tell my 1922 sedan as it have been driving for 10 years with Motorcraft and I have never had to clean them.....
I believe we previously have agreed that milage varies considerably when it comes to plugs. What may be good on one engine may not be the best for another.
Royce is correct about champion X plugs being available at reasonable prices if you're patient, as are other antique Model T plugs. A set of new X's will set you back over a hundred bucks, so used is the way to go for those. If you're in a hurry, there's Autolite 3095. Cheap and functional. I'm currently running a set, and so far they're OK.
Here's some reading on the X plugs: http://dauntlessgeezer.com/DG95.html
Thanks for the explanations. I didn't know I had the later plugs in mine.