| sarahcecelia | -- 05-05-2021 @ 2:53 PM |
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I bought mt 1940 Cvt. about 3 or 4 years ago, and it always ran good and started on the first crank! Today it started and faltered and died several times. I took the plugs out to check them, and they were all fouled with black soot. I proceeded to wire wheel them and then check the gaps on them. They are H10c's; what does that C designate? (cold?) I checked all of the gaps and they were all set to 20 thousands!! I reset them to a "loose" 31 thousands and re-installed them; and again it starts easily and runs well. Whomever set those plugs didn't know diddly about the car. I can't believe it ran so well the past few years with that small plug gap! . I'm going to order a set of H10 Champions, unless someone that knows, on the forum, tells me that it takes a dfferent one. I'm not that familiar with the 40 V8, but my thinking tells me that they , like the 50'series V8's, take champion H10's. Regards, Steve Lee This message was edited by sarahcecelia on 5-5-21 @ 2:54 PM
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| 51504bat | -- 05-05-2021 @ 3:26 PM |
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Autolite 216's will work as well. I'm running Autolites but previously used Champion H10's. Not sure I noticed a difference. ______________ No signature
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| kubes40 | -- 05-05-2021 @ 3:37 PM |
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Steve, .025" is correct. The "C" indicates copper core. Heck, I use authentic H10's, two rib plugs in my cars and they run wonderfully. Mike "Kube" Kubarth
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| 40 Coupe | -- 05-06-2021 @ 4:31 AM |
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The C is for a copper coating on some of the internal parts which cuts down on corrosion, not a bad idea for our style of driving. H-10 or H-10C are OK. Ford recommended 0.030" as plug gap.
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| kubes40 | -- 05-06-2021 @ 6:19 AM |
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Mike "Kube" Kubarth This message was edited by kubes40 on 5-6-21 @ 2:30 PM
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| JayChicago | -- 05-06-2021 @ 8:51 AM |
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I didn’t know Ford recommend .030. I recall reading many posts here and elsewhere recommending .025 or .026.
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| 1931 Flamingo | -- 05-06-2021 @ 12:56 PM |
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My mechanic installed NGK plugs, not sure which ones. Paul in CT
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| sarahcecelia | -- 05-06-2021 @ 5:24 PM |
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Thanks Kubes; OOPs; I thought they would gap the same as my '50 v8 at 32 thousandths. Regards, Steve Lee
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| sarahcecelia | -- 05-06-2021 @ 5:32 PM |
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Autolites can give you problems; even though they are a Ford product! Champions are the brand recommended by FORD! Regards, Steve Lee
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| JayChicago | -- 05-06-2021 @ 6:35 PM |
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“My mechanic installed NGK plugs, not sure which ones. Paul in CT” NGK-4 Or NGK-6 , which is a little hotter, may help if needed to burn off deposits.
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| TomO | -- 05-07-2021 @ 7:45 AM |
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I have driven many thousands of miles with Autolite plugs. They are just as good as any other plug that is made today. Tom
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| trjford8 | -- 05-07-2021 @ 7:52 AM |
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X2 TomO on the Autolites. I have used them in every flathead I have owned and never a problem..
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| 40 Coupe | -- 05-07-2021 @ 8:17 AM |
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Ford Service Bulletins for 38 and 39 list the plug gap to be 0.025" In a special letter from the branch to dealers and all service personal, in 1941 the gap was supposed to be 0.030" and back to the Service Bulletins for 1948 the gap was 0.025 to 0.028" Ford often changed specifications. I would use the latest Spec. of 25 to 28 All of these above Spec. are for the 85HP engine of 1938-1940. This message was edited by 40 Coupe on 5-8-21 @ 4:30 AM
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| JayChicago | -- 05-08-2021 @ 7:06 AM |
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40 Coupe: Thanks for doing that research. That all makes sense. Like most engineering things, there has to be a compromise. A larger gap may provide better ignition of the fuel charge. (may! Not needed in our low-compression engines) But a larger gap runs the risk the high voltage will find a path of lesser resistance elsewhere.
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| DanD32 | -- 05-08-2021 @ 1:53 PM |
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Jay from what I have read on NGK plugs the lower the # the hotter the plug I run 4's and are burning great with A very mild cam and 2 strombergs with 41 jets I love my 53 flathead
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| JayChicago | -- 05-09-2021 @ 6:38 PM |
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DanD I checked my file and you are correct. I was wrong. I was going by memory, and I should know better than to do that, cuz I have CRS. NGK B6L standard heat range NGK B4L hotter
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| DanD32 | -- 05-10-2021 @ 12:13 PM |
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There is A lot of good reading on the NGK web site about choosing the right plugs they make for alot of cars both preformence and stock styles also. Just another option if champtions or autolites are giving anyone problems or want to try something different.
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