MochetVelo Posted October 15, 2020 Share Posted October 15, 2020 Does anyone know where to find an early spark plug compatibility chart? I'm looking specifically for a 1909 Buick Model 10. Phil Link to comment Share on other sites More sharing options...
JFranklin Posted October 15, 2020 Share Posted October 15, 2020 Back then plugs were sold by hole size, thread pitch, heat range and reach. There are new plugs that will fit your car. What type does it have now? Link to comment Share on other sites More sharing options...
MochetVelo Posted October 15, 2020 Author Share Posted October 15, 2020 Here is a page I found: https://www.sparkplug-crossreference.com/ Phil Link to comment Share on other sites More sharing options...
Flivverking Posted October 16, 2020 Share Posted October 16, 2020 I've seen mentioned for a 1910 model 10. Originally used the AC-1 plug.( take a part) Known then in the trade as " the Buick plug" 7/8 thread 1-1/8 hex "Long plug with the 1/2" reach" Later on an improved "Titan" (one piece design plug over the earler 2 piece crappy leaky one )used in 1915-25 Buicks were AC 78 long or 78LT Today a common replacement is the Autolite 3076 or 3077( 3077 a step hotter) Champion W18 , W89, 518 have worked o.k for some (I've read) You can find cross referances between these common plugs an go from there Learning the meaning of numbering /letter system for each is helpfull for heat and reach etc. 1 Link to comment Share on other sites More sharing options...
JFranklin Posted October 16, 2020 Share Posted October 16, 2020 (edited) From Flivverking's figures a champion 3X used in Model A Fords would be the closest new plugs to what was used originally in your car. They can be bought/ordered at most auto supply stores Part # 429. They are a take apart plug like the early originals. Edited October 16, 2020 by JFranklin Added info (see edit history) Link to comment Share on other sites More sharing options...
Flivverking Posted October 16, 2020 Share Posted October 16, 2020 Very funny! I avoided the 3x as it is sooo closely associated with the model "A " anyone who knows old cars upon seeing them in a 09 Buick will say " Oh! He has Model A plugs in there" 😝 They would give the best overall appearance in such an early machine. Note:I believe if running just a mag in that old Buick the plug gap would be far smaller then the Model A ford specs.of .032 -.035 range.. ..025 (possibly less) has been mentioned or written about in old manuals.. Link to comment Share on other sites More sharing options...
Stude Light Posted October 18, 2020 Share Posted October 18, 2020 Champion 1-Com might be a good choice. You can find NOS ones on eBay occasionally. They came with both style wire clips. The early ones are take apart, the later ones are single piece. I use them in my ‘23 Studebaker https://www.ebay.com/itm/NOS-Vintage-CHAMPION-1-COM-Spark-Plug-7-8-Thrd-IHC-Hit-Miss-Engine-Tractor/154145644005?hash=item23e3cbdde5:g:nRMAAOSwPD1fibjt Scott 1 Link to comment Share on other sites More sharing options...
cudaman Posted October 27, 2020 Share Posted October 27, 2020 Here are all the charts I have, don't know if your Buick is listed in one of them or not. 4 Link to comment Share on other sites More sharing options...
Mike Hage Posted January 27 Share Posted January 27 Anyone know what plug is factory correct for 1917 Studebaker EF series 18 4 cyl? Link to comment Share on other sites More sharing options...
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