rjengelhart Posted October 7, 2014 Share Posted October 7, 2014 Hi everybody. Looking for a little spark plug advice. Will be replacing my spark plugs soon, and wonder if anybody uses anything besides the AC 46 per the owners' manual.Thanks.Bob Engelhart'41 Super Coupe Link to comment Share on other sites More sharing options...
Daves1940Buick56S Posted October 7, 2014 Share Posted October 7, 2014 Bob:I was using AC45 (what Bob's sells) and they were fouling due to my essentially nonexistant compression so I switched to AC47's off EBay. But now that the rings are done am hoping to go back to the 45s.Cheers, Dave Link to comment Share on other sites More sharing options...
Larry Schramm Posted October 7, 2014 Share Posted October 7, 2014 On the old AC spark plugs, the higher the number, the hotter the plug. The S means there is a "skirt" or area below the threads on the shell. Link to comment Share on other sites More sharing options...
Guest Grant Magrath Posted October 10, 2014 Share Posted October 10, 2014 http://www.clubplug.net/cross.htmlCheersGrant Link to comment Share on other sites More sharing options...
Guest buickkuhn Posted October 19, 2014 Share Posted October 19, 2014 Bob:I was using AC45 (what Bob's sells) and they were fouling due to my essentially nonexistant compression so I switched to AC47's off EBay. But now that the rings are done am hoping to go back to the 45s.Cheers, DaveI too was running the AC45 gapped around .025 for past years then i too ran out of usable compression . Now I am in deep into a rebuild . Link to comment Share on other sites More sharing options...
Larry Schramm Posted October 20, 2014 Share Posted October 20, 2014 The hotter plug AC-46 vs/ AC-45 will help with fouling of the sparkplug caused by oil consumption for a while, but the engine will still need a rebuild at some time. Link to comment Share on other sites More sharing options...
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