Guest Australian 1923 Posted May 6, 2007 Share Posted May 6, 2007 Help can anyone help with the best modern spark plugs to use in my 1923 6cyl Link to comment Share on other sites More sharing options...
Mark Shaw Posted May 7, 2007 Share Posted May 7, 2007 Try this cross reference. http://www.sparkplugs.com/default.asp Link to comment Share on other sites More sharing options...
Guest Australian 1923 Posted May 7, 2007 Share Posted May 7, 2007 Hi MarkRegret that website won't accept messages from overseas and does not seem to go back beyond the early sixties.Thanks for your responseDavid Australia 1923 Link to comment Share on other sites More sharing options...
D Binger Posted May 7, 2007 Share Posted May 7, 2007 Most modern spark plugs are a little longer than the old ones and when you put the side cover on your engine the plugs will short out. I found that Autolite #3076 are shorter than the others. The 3076 are tractor plugs. I use them on my 22 Buick and my 14 Buick. The bases are blued when you get them so you don't have to hide the cad plating. Link to comment Share on other sites More sharing options...
Jan Arnett Posted May 7, 2007 Share Posted May 7, 2007 Mark:What are you putting the plugs in? Link to comment Share on other sites More sharing options...
Mark Shaw Posted May 8, 2007 Share Posted May 8, 2007 Give me the make and part number of what is currently in it and I will check it for you. I run Autolite 3077 in both of my older Buicks. 14mm thread, 19mm(3/4") reach, 13/16" hex, extra projected tip, .044" gap They are the right thread, length, and are a hot plug that does not foul. You might try a John Deere tractor store where they stock Champion plugs for old tractors. Link to comment Share on other sites More sharing options...
mlander Posted May 8, 2007 Share Posted May 8, 2007 As Mark states you failed <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" /> to state the description of the car whether it is an American car and it?s exact name and do you have the original type of sparkplug. What you need to find out is just what brand it had in it from the factory and its reach and thread diameter. Whether it was 7/8? x 18 threads per inch pitch or 18 millimeters x 1.5 millimeters pitch.I don?t believe that very many cars made in the U.S.A. had 14mm by 3/8 reach spark plugs in 1923. Also of high importance is the thread reach which is the distance from the end of the spark plug on the threaded end to the <span style="text-decoration: underline">washer face</span> <span style="text-decoration: underline">without</span> the washer attached! M. L. Anderson <img src="http://forums.aaca.org/images/graemlins/smile.gif" alt="" /> Link to comment Share on other sites More sharing options...
D Binger Posted May 8, 2007 Share Posted May 8, 2007 From another post he made on the Buick Forum it is a 1923 Buick six cylinder. Link to comment Share on other sites More sharing options...
mlander Posted May 8, 2007 Share Posted May 8, 2007 PRE-WAR GENERAL AC SPARKPLUG CHART 1929-1942 ONLY.1929-30???????...??..88 (18mm)1931 thru 1937?????.??84 (18mm)This an expanded list of just the 18mm sparkplugs only. <span style="font-weight: bold">18mm by 1/2" reach</span> CHAMPIOND6D9D14D16D18* SEE BELOWD21D23D15Y POWER TIPD18Y POWER TIPDELCO ACC81C82C83C85C86C87C88C85S POWER TIPC86S POWER TIPAUTOLITE373386 RESISTOR388 RESISTOR3116 POWER TIPThis list does not fo back to 1923 but someone at the Pre-World War 2 posting area probably knows if this works!I posted this in the Buick area quite some time ago. Because a sparkplug number is listed on this sheet does not necessarily mean it is easily available from the various AC, Autolite or Champion dealers. At the rate that these plugs are being removed from manufacturer?s charts many sparkplugs will no longer be available, from any dealer shelves in even the near future. This seems to be particularly true of AC. M. L.Anderson Link to comment Share on other sites More sharing options...
D Binger Posted May 8, 2007 Share Posted May 8, 2007 Mark,Is the 3077 the same length as the 3076? DanGood talking to you in Bakersfield. Link to comment Share on other sites More sharing options...
mlander Posted May 8, 2007 Share Posted May 8, 2007 3076=7/8-18 thd, 5/8" reach, 15/16" hex, gasket seat, heavy duty center electrode3077= 7/8-18 thd, 5/8" reach, 15/16" hex, gasket seat, heavy duty center electrodeEdit May 23-2007 I have finally found the AutoLite "Catalog" at http://www.noelsautoparts.com.au/Autolite%20Catalogue%20NCAP.pdfIt seems very pecuuliar that this two plugs above are the only Autolite plugs of 7/8"-18 x 5/8 reach listed. No other of any reach are listed??? I am going to see if I can find any AC or Champion. M. L. ANDERSON Link to comment Share on other sites More sharing options...
mlander Posted May 24, 2007 Share Posted May 24, 2007 I response to the 7/8" - 18 threads per inch interchangeability, here is a list I made up some time ago,CHAMPION 7/8?-18 ALL. PLUG TYPE.. REACH......... HEX.............. PRICE EACH 510............... W10............. .625?............ 15/16?.......... $6.51 569............... W14............. .625?............ 15/?6?............ $6.51 561............... W16Y........... .625?............ 15/16?.......... $6.51 518............... W18............. .750?............ 15/16?.......... $6.51 520............... W20............. .625"............ 15/16?.......... $6.51 228............... RW77PP....... 1.000?.......... 15/16?.......... $46.52 201............... W77N........... .625?............ 15/16?.......... $18.15.......... 4 GROUND ELECTRODES539............... W77N........... .625?............ 15/16?.......... $18.15............................... ?631............... RW78N......... .860?............ 15/16?.......... $32.00............................... ?553............... RW80N......... .625?............ 1.000?.......... $32.00............................... ?200............... RW80N......... .625?............ 1.000?.......... $32.00............................... ?1207............. RW80PP....... .625?............ 15/16?.......... ?......................................... 580............... W80N........... .600?............ 15/16?.......... $18.15.......... 4 GROUND ELECTRODES202............... W80N........... .600?............ 15/16?.......... $18.15................................... 582............... RW82P......... .625?............ 15/16?.......... $52.98................................... 559............... RW83F......... .625?............ 1.000?.......... $39.36.......... 3 GROUND ELECTRODES545.............. W85N........... .600?............ 15/16?.......... $18.15.......... 4 GROUND ELECTRODES203............... W85N........... .600?............ 15/16?.......... $18.15.......... 4 GROUND ELECTRODES589............... W89D........... .625?............ 15/16?.......... $7.99............ PROTRUDING NOSE595............... C95F............ .625?............ 1-1/8?........... $23.29.......... 3 GROUND ELECTRODES562............... W95D........... .625?............ 15/16?.......... $15.55.......... PROTRUDING NOSE513............... C97B............ .1.250?..........1-1/8?........... $33.88.......... 2 GROUND ELECTRODESM.L. Anderson Link to comment Share on other sites More sharing options...
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