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Old 05-06-2020, 08:37 AM   #1
HS
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Default Good Spark Plug for a Brumfield 7 to 1 Head

I have a Brumfield 7 to 1 Head , I love it! My head has a recessed Plug hole (my fault ). Its really been a GOOD one. However, I have been running a Champion W14 has been on the colder side, any suggestions for a Hoter plug. Champion W16Y, Motorcraft TT10 etc, etc Larry if you are out please jump in.

Thanks in advance
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Old 05-06-2020, 09:17 AM   #2
Jim/GA
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

In the past, Larry has recommended the Autolite 3076 for this head. That's what I use.

Are the W14's fouling? They are roughly the same nominal heat range as the 3076's are.
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Old 05-06-2020, 09:28 AM   #3
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

JIm,
Thanks for your Note, Yes The W14's are foulding Big Time!!

Hugh
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Old 05-06-2020, 10:04 AM   #4
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

I've had good success with W18's (Current #518) in a BF 5.9 head
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Old 05-06-2020, 10:11 AM   #5
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

Same here Champion W-18
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Old 05-06-2020, 10:11 AM   #6
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

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I also have a Brumfield Super head. My compression ratio is higher than yours, though. About 8:1, my cranking compression is 155-160 psi. The W14's run well in mine. If your head is fouling W14's, even at just 7:1, you may have other issues:

1) Running with a too rich carb. Do you have a lambda meter?
2) Your current cam is a bad match for the head/CR.
3) Dizzy body or ignition system causing a lot of misfire while cruising.
4) Late timing. (With 7:1 or higher you cannot just leave the advance lever alone- you kind of need to think like a vacuum advance as conditions change.)
5) Tired rings. Do a compression check. With 7:1 you should see at least 115 psi.

Note: For those casually reading this string, a Brumfield Super head is a completely different head than the Brum 5.9 head. Plugs that run well in the standard Brumfield will perform differently in the the Super head. It has considerably shallower chambers creating a somewhat different flow pattern, a lowered and re-positioned spark plug, and spark plug gasket seats that are recessed into bored holes well below the top of the head. This last issue makes some plugs nearly impossible to use if the hex is at the gasket face, as there is no room for a socket to get that far down the recessed plug wells. An option is to use 18mm to 14mm reducers and run extended length 14mm plugs. Platinum tipped plugs, anyone?
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Last edited by MikeK; 05-06-2020 at 11:14 AM. Reason: I'm getting dyslexic!
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Old 05-06-2020, 10:53 AM   #7
HS
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

Mike,

Thanks Good stuff! I have a Recessed Spark Plug hole in my 7 to 1. I will do the Compression test and see If every thing is OK? what plug Might to recommend. W 14 not working so gooD It like I a Need a Hoter plug-- I think?

Hugh
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Old 05-06-2020, 11:01 AM   #8
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

Quote:
Originally Posted by HS View Post
Mike,

Thanks Good stuff! I have a Recessed Spark Plug hole in my 7 to 1. I will do the Compression test and see If every thing is OK? what plug Might to recommend. W 14 not working so gooD It like I a Need a Hoter plug-- I think?

Hugh
Mr. Smith, wouldn't a recessed plug run hotter than one that is located higher in the chamber??
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Old 05-06-2020, 11:04 AM   #9
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

Howdy Brent,
Yes sir, One would think?

Hugh
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Old 05-06-2020, 01:10 PM   #10
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

Quote:
Originally Posted by MikeK View Post
I also have a Brumfield Super head. My compression ratio is higher than yours, though. About 8:1, my cranking compression is 155-160 psi. The W14's run well in mine. If your head is fouling W14's, even at just 7:1, you may have other issues:

1) Running with a too rich carb. Do you have a lambda meter?
2) Your current cam is a bad match for the head/CR.
3) Dizzy body or ignition system causing a lot of misfire while cruising.
4) Late timing. (With 7:1 or higher you cannot just leave the advance lever alone- you kind of need to think like a vacuum advance as conditions change.)
5) Tired rings. Do a compression check. With 7:1 you should see at least 115 psi.

Note: For those casually reading this string, a Brumfield Super head is a completely different head than the Brum 5.9 head. Plugs that run well in the standard Brumfield will perform differently in the the Super head. It has considerably shallower chambers creating a somewhat different flow pattern, a lowered and re-positioned spark plug, and spark plug gasket seats that are recessed into bored holes well below the top of the head. This last issue makes some plugs nearly impossible to use if the hex is at the gasket face, as there is no room for a socket to get that far down the recessed plug wells. An option is to use 18mm to 14mm reducers and run extended length 14mm plugs. Platinum tipped plugs, anyone?
I agree, I think I'd look at the carb running too rich. Air filter on it? Flow tested jets?
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Old 05-06-2020, 01:32 PM   #11
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Default Re: Good Spark Plug for a Brumfield 7 to 1 Head

10-4 I don't have a air filter on my Carb, but I do have an old Steel mesh spark arrest

HS
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