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02-06-2020, 11:01 PM | #1 |
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Spark Plug reach into head - Is this normal?
I have a C59A with C7RA-A heads. I had purchased NGK B-6L plugs which is the recommended one for my year flathead. These are equivalent to the Autolite 216. The reach is listed as 7/16" (11 mm). Looking at it loosely installed (finger tight), it seems to me to be sitting too low, as it doesn't even protrude into the head. There are two exposed threads left, and if torqued properly, I'm guessing it will go deeper into the head by one thread. Is the plug supposed to sit this low?
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02-07-2020, 12:17 AM | #2 |
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Re: Spark Plug reach into head - Is this normal?
I wouldn't be doing any "guessng". Torque it and see.
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02-07-2020, 01:10 AM | #3 |
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Re: Spark Plug reach into head - Is this normal?
Looks ok to me.
You don’t want it deep enough for the valve to slap it. |
02-07-2020, 01:51 AM | #4 | |
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Re: Spark Plug reach into head - Is this normal?
Quote:
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02-07-2020, 01:52 AM | #5 |
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Re: Spark Plug reach into head - Is this normal?
This is what an H-10 plug with 7/16" reach looks like installed in an EAB head.
Yours should be OK.
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02-07-2020, 05:48 AM | #6 |
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Re: Spark Plug reach into head - Is this normal?
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02-09-2020, 01:07 PM | #7 |
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Re: Spark Plug reach into head - Is this normal?
I found the original Champion H11 plugs. I torqued both the Champion and NGK to about 21 ft-lbs. and they about the same to me which is good.
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02-09-2020, 01:22 PM | #8 |
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Re: Spark Plug reach into head - Is this normal?
They both look good. A good practice is to check valve 2 plug clearance in a situation ur unsure of.
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02-09-2020, 01:25 PM | #9 |
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Re: Spark Plug reach into head - Is this normal?
In my mind, as long as the ground strap on the spark plug doesn't go lower than the ledge in the head that surrounds it, there should not be an issue.
Sal |
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