Rata Road Posted April 24, 2023 Share Posted April 24, 2023 My 27 Chrysler 50 recommends the above spark plug. The car currently has Campion C-4's in it. Are these a correct match? Can anybody provide a link to a cross reference guide pleas. Link to comment Share on other sites More sharing options...
dodge28 Posted April 24, 2023 Share Posted April 24, 2023 As far as I can remember C-4 Champion was very popular interchange I stand corrected. Link to comment Share on other sites More sharing options...
Terry Bond Posted April 24, 2023 Share Posted April 24, 2023 (edited) I've got three references in my spark plug literature collection- First is a small brochure printed in 1937 for Chrysler vehicles. See photo 1. Second is a 1942 Champion publication "Champion Spark Plug Service." the Chrysler section s photo 2. third item is a publication that Champion printed in 1950 listing spark plug applications for "antique cars." Photo 3 shows the Chrysler info. The 1942 publication includes information on substitutes and that lists the C-4 as a substitute for the 2 identified as a recommendation in the 1937 publication. It looks like the C-4 would work in your car. It certainly would be the easiest to find. NOS examples are easily found. Hope this helps. Terry Edited April 24, 2023 by Terry Bond (see edit history) 1 Link to comment Share on other sites More sharing options...
1937-44 Posted April 24, 2023 Share Posted April 24, 2023 A modern replacement for the Champion c-4 is Champion W-18 and slightly colder is the Champion W-16. Link to comment Share on other sites More sharing options...
Minibago Posted April 25, 2023 Share Posted April 25, 2023 Brass reducer from the old 7/8 to a more modern plug 14mm might be a cheaper option. If your engine has a requirement for long reach plugs as in the earlier DB cars then a W89D is what I use. 1 Link to comment Share on other sites More sharing options...
Frank DuVal Posted April 25, 2023 Share Posted April 25, 2023 I see the W89D is a 7/8" plug. Are they gasketless, or just off for the picture? Link to comment Share on other sites More sharing options...
31 LaSalle Posted April 25, 2023 Share Posted April 25, 2023 On 4/24/2023 at 1:59 AM, Rata Road said: My 27 Chrysler 50 recommends the above spark plug. The car currently has Campion C-4's in it. Are these a correct match? Can anybody provide a link to a cross reference guide pleas. My Chrysler 1928 conv coupe model 72 had champion c4 plugs i have changed them for c5 have been told they should be ok not had chance to try them yet Link to comment Share on other sites More sharing options...
Terry Bond Posted April 25, 2023 Share Posted April 25, 2023 2 hours ago, Frank DuVal said: I see the W89D is a 7/8" plug. Are they gasketless, or just off for the picture? 7/8" plugs require a gasket. The 1/2" tapered thread (model T style) don't need a gasket to help seal them. Terry Link to comment Share on other sites More sharing options...
viv w Posted April 25, 2023 Share Posted April 25, 2023 I ran my series 52 for years with Champion W20 plugs with no problems, I have found out more recently that a W16 is probably better suited. The C4 is used on Model A Fords and as the Model A and Chrysler motors are very similar in size and compression ratios they probably will work okay. Both my series 62 and G70 motors had C5 plugs that were fitted in the 50's. Link to comment Share on other sites More sharing options...
Hans1 Posted April 25, 2023 Share Posted April 25, 2023 a little history from my books Early AC Plug Chart Chrysler 1927 Mod 50 ( AC regular plug "Y" AC long life " L-9" ) Regular line AC plug "Y" Universal line AC plug " AA" Champion 2-S /////////////////////////////// Later AC chart AC plug "A" Splitdorf plug 6" ///////////////////////////////// Chrysler six "50" thru 1929 AC "76" Titan "1" /////////////////////////////// Chrysler 1924 - 1929 Old type C-4 New type C-16C /////////////////////////////// //////////////////////////// Champion C-4 to AC-76-S Champ. C-16C + Link to comment Share on other sites More sharing options...
Rata Road Posted April 27, 2023 Author Share Posted April 27, 2023 Thanks Guys, lots of great info. Link to comment Share on other sites More sharing options...
dodge28 Posted April 27, 2023 Share Posted April 27, 2023 More than you can throw a stick at. At least, members are listening and responding, Great fellows, thank you all. Link to comment Share on other sites More sharing options...
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