| dicker | -- 04-25-2013 @ 8:57 AM |
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I believe Ford specs are for D-16 spark plugs. What is the difference between the UD-16 and the D-16 spark plugs? Are they interchangeable and do they use the same gap clearance? Can I use them interchangeably-that is,mixed in the car? Dicker Dick Kurtz
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| dicker | -- 04-25-2013 @ 4:05 PM |
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I don't usually answer my own discussions, but here goes. Having full access to the library at the San Diego Auto Museum as a volunteer,I did some research on this subject and found two different replies. One book shows Champion 18 spark plugs (18MM)for 35-37 85HP engines. Another book shows Champion 7 plugs for the same years and engines. Now, I am really confused. What do you say?? dicker Dick Kurtz
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| JM | -- 04-26-2013 @ 7:13 AM |
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The original plugs were three piece Champion 7. Most folks would use these on the show field. For driving I use modern versions of Champion, Autolight, or NGK plugs. Don't have the numbers handy. Edit: Corrected information. Removed Bosch and replaced with NGK JM This message was edited by JM on 4-27-13 @ 7:54 PM
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| dicker | -- 04-26-2013 @ 7:25 AM |
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Thanks, JM. Does your car run as well with the C-7's as it does with the other modern versions? dicker Dick Kurtz
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| JM | -- 04-26-2013 @ 12:11 PM |
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Dick, I've never run C7's in my '35 passenger cars. From what I have been told C7's were used in commercial vehicles. I use three piece plugs that are marked with just number 7 when I show my original fordor sedan in Rouge Class at the EFV8C/A national meets. The engine seems to run as good on those #7 plugs as it does on the modern plugs I mentioned previously. JM
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| JM | -- 04-26-2013 @ 12:12 PM |
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Deleted This message was edited by JM on 4-26-13 @ 12:16 PM
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| dicker | -- 04-26-2013 @ 12:56 PM |
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Thanks, JM. I put the old plugs back in after cleaning them and it runs OK. They are D-16 and they have done fine for many years and show no burning or wear so why not use them!! Dicker Dick Kurtz
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| JM | -- 04-26-2013 @ 8:28 PM |
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Delete This message was edited by JM on 4-26-13 @ 8:57 PM
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| fenbach | -- 05-25-2013 @ 8:50 PM |
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NAPA lists champion CHA 541. and autolite ASP 386. get resistor plugs if you have a radio to cut down on static. you'll get a bigger spark w/o the resistor. you can test any plug with an ohmmeter. put one lead on the tip and the other on the center electrode, the round tip at the bottom of the plug. 0 ohms for a non-resistor. 1000s of ohms for a resistor plug.
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| chas34 | -- 05-26-2013 @ 10:13 AM |
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The Champion and/or Autolite plugs that you reference; how do they compare with the Champion 7 heat range? ... any suggestions on how to find out the various heat ranges and their comparisons? ... chas34
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| fenbach | -- 05-26-2013 @ 9:13 PM |
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cha 541 plugs must be standard going by the pictures on page 374 of the apr 15, 1938 service bulletin. on the the std. plug, the ground electrode is parallel to the base of the plug. on a hot plug [no. 6] the electrode is longer and noticeably angled toward the round tip, on a cold plug [C-7] it's shorter and angled away. i don't see any mention of the heat ranges, just that the ground electrode is closer to or farther from the water jacket.
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