bobs1916 Posted February 25, 2019 Share Posted February 25, 2019 Hello I am restoring a 1918 FWD Model B with a Wisconsin Model A engine. The original plugs are CHAMPION Tr Spec 5 I cannot locate these in any cross reference to find a suitable modern replacement. I would also welcome any one who has a set of these for sale Thank you Link to comment Share on other sites More sharing options...
Larry Schramm Posted February 26, 2019 Share Posted February 26, 2019 Would you have any pictures of what you are looking for? Link to comment Share on other sites More sharing options...
Layden B Posted February 26, 2019 Share Posted February 26, 2019 Aren't your spark plugs 7/8 ALAM threads ? Model A Fords use this: https://www.snydersantiqueauto.com/show-spark-plugs Spendy but you will probably only buy one set ever! Link to comment Share on other sites More sharing options...
bobs1916 Posted February 28, 2019 Author Share Posted February 28, 2019 (edited) On 2/26/2019 at 12:52 PM, Layden B said: Aren't your spark plugs 7/8 ALAM threads ? Model A Fords use this: https://www.snydersantiqueauto.com/show-spark-plugs Spendy but you will probably only buy one set ever! THis is what I need Vintage CHAMPION TR. SPEC. "S" SPARK PLUG Hex: 28 mm = 1-1/8" Threads: 22 mm = 7/8 Edited February 28, 2019 by bobs1916 (see edit history) Link to comment Share on other sites More sharing options...
Terry Bond Posted March 1, 2019 Share Posted March 1, 2019 That may not be the "original" plug as Champion began using other than simple numerical designations long after 1918. I do have a catalog from January 1st 1924 that indicates the "correct" plug for the FWD is a Champion 4. TR Spec indicates "Truck Special". I have a late 1930s Champion catalog that lists that plug as suitable for your FWD, and I have a later catalog (approximately 1936) that indicates a Champion 1 Com. That catalog indicates the 1 Com is a substitute for the TR Spec plug. Looks like you could try the C4 or the 1 Com, both of which would be easier to find. It's often difficult to figure out which number plug replaced which as the catalogs I've seen don't seem to have that level of detail, and they often are not dated. I've collected catalogs (and spark plugs) for a long time. There are a couple of plug dealers around who may be able to help and the usually advertise in Gas Engine Magazine. Hope this helps some. Terry Link to comment Share on other sites More sharing options...
bobs1916 Posted March 14, 2019 Author Share Posted March 14, 2019 (edited) thank you terry I got a set of NOS C-1s that will work Edited April 2, 2019 by bobs1916 addition/correction (see edit history) Link to comment Share on other sites More sharing options...
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