Twitch Posted February 8, 2007 Share Posted February 8, 2007 Without starting a controversy of which plug is better again I just want to know if anyone has used so-called modern cross reference plugs. Was at an Auto Zone and they told me Champion RJ-12YC would substitute for J-12s in the 288. I compared one to an AC 45 and from the gasket to the electrode its about a 1/4 inch longer. I wouldn't know if that is kosher but don't want to experiment either since I can get J-12s from NAPA. Anyone ever use these? <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> Link to comment Share on other sites More sharing options...
mrpushbutton Posted February 8, 2007 Share Posted February 8, 2007 I would always go with an AC plug over a Champion, any day. Link to comment Share on other sites More sharing options...
Twitch Posted February 8, 2007 Author Share Posted February 8, 2007 Yeah but NAPA has no ACs any more in their listings for this heat range. Link to comment Share on other sites More sharing options...
Guest BigKev Posted February 9, 2007 Share Posted February 9, 2007 Check Ebay as that is where I got my AC-45's from. My Napa has the Resistor style 45's, but not the non-resistor type. I was also told the AC-45's are used in tractors and some riding lawn mowers, so a store that sells that type of equiptment may have them.The AC-45 were also used in late 60's Camaros I belive, so that may provide a x-ref also. Link to comment Share on other sites More sharing options...
Guest Albert Posted February 9, 2007 Share Posted February 9, 2007 KEV do not use the longer plugs,, the valves will hit the electrode,,, Been there and done that.. you have to watch the protrusion, the RJ12C works the "Y" is a projected core Nose will hit one of the walves.. Link to comment Share on other sites More sharing options...
Guest BigKev Posted February 9, 2007 Share Posted February 9, 2007 Albert, I'm using the AC-45's. Are you saying those are too long also???? <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest imported_48DLX Posted February 9, 2007 Share Posted February 9, 2007 I'm using M-8's in my 48 DLX, are there better plugs to use? Link to comment Share on other sites More sharing options...
Guest Albert Posted February 11, 2007 Share Posted February 11, 2007 AC45 are the correct lenght, i bought two boxes of 45's at a swap meet for my cars and are good.. Link to comment Share on other sites More sharing options...
scott12180 Posted February 14, 2007 Share Posted February 14, 2007 Here's a story on Champion plugs.Recently I put a new set of Champion W-18 (or similar) into my 1926 Packard Eight. The car ran terribly. I could barely get it home from once around the block. I removed the plugs and found them to be wet with gasoline. But more importantly, oneplug had it's electrode mashed together. What happened was that the Champion plugsare longer than AC or Blue Crown or similar plugs. The long plug was interfering withthe VALVE. In other words, the exhaust valve had hit the bottom of the spark plug and closedthe gap on one plug. I got lucky on the other seven. Did not bend the valve, thankfully. I also think that possibly the long Champion plugs extended too far down to properly ignite thefuel mixture. When I put in a set of old-time Blue Crown Husky plugs, the car ran perfectly. Your theories as to why the Champion plugs didn't work are welcome. NAPA accepted the eight plugsback as defective returns, by the way. Very good of them. --Scott Link to comment Share on other sites More sharing options...
Twitch Posted February 14, 2007 Author Share Posted February 14, 2007 I figured the extra 1/4 inch would be devestating on the RJ-12YCs. I want something a bit warmer and the J-12 look about right. I'm looking for AC 46s or 47s which I have a line on too. Since most all my driving is short distances I'm running rich a lot till warm up is complete and temps get up and I'm getting deposits telling me I should use a hotter plug. I'm taking an old AC 45 along for length comparison on anything I look at. Link to comment Share on other sites More sharing options...
rybikowsk Posted February 19, 2007 Share Posted February 19, 2007 champion some years back was one of the best, I no longer find that the case. a couple of years ago I needed a plug for my honda mower, the only one I could get close by was a champion, I hand started it in the hole and then took a turn or so with the wrench, It did not feel right. I pulled the plug put on my glasses and took a look,the threads on the plug were not right the honda has a very long threaded plug hole this saves people from pulling the threads. I cleaned up the outer threads and put the old ngk back in. carpe diem.michael <img src="http://forums.aaca.org/images/graemlins/tongue.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest JT Posted February 19, 2007 Share Posted February 19, 2007 <div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I'm using M-8's in my 48 DLX, are there better plugs to use? </div></div>That's the only new 10 mm plug available from AC that I know of. The old AC number was a 104 or 106. Link to comment Share on other sites More sharing options...
Twitch Posted February 27, 2007 Author Share Posted February 27, 2007 After watching Ac plugs end up at $45 for a set on Ebay I bought the Chapmions as NAPA. The new designation cross reference from Champion for the old J-12 is RJ-12Y. NOT the YC which is way longer at the electrode. They are in an seem to be doing really fine! Link to comment Share on other sites More sharing options...
Guest 51Patty400 Posted March 5, 2007 Share Posted March 5, 2007 That's what I am using in my 288 right now.- Mark Link to comment Share on other sites More sharing options...
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