What plugs for an SBC with TFS heads with the Edelbrock Eforce Supercharger?
07-23-2009, 09:00 PM
#1
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What plugs for an SBC with TFS heads with the Edelbrock Eforce Supercharger? These heads are for an 87 to 95 application. Angled plugs http://www.summitracing.com/parts/TFS-30400006-CNC/ , The 355 is at 9.3 to 1 compression and i am at 5200 ft in elevation ( if this makes a difference??). I am planning on running 8 to 10lbs of boost. The only thing i know is that i need to go with a non-projected tip. Thanks guys!!
07-23-2009, 09:43 PM
#2
trick flow doesn't tell you?
you can get the master excel spark plug cross reference here
http://home.att.net/~ngkaz/wsb/html/...ome.html-.html
in excel do a Data - Sort on columns for reach, thread size, no for projected tip, and so on to narrow down what's available.
when i click on your summit link, it shows some spark plugs but i'm not sure if they're correct for that head. If they are, then you need 0.750" (19mm) reach plugs, having a 14mm thread size, gasket seat. And it shows it as a 5/8" (0.625") hex size for the spark plug socket, but if you can fit a plug having the larger 13/16" (0.8125") hex size then that will give you a lot more plugs to choose from.
For a non-projected tip, I'm seeing
NGK GR5 (#3430)
AC R42XLS, R41XLS
Denso W20EXR-U (#3066)
but since it's not my money, I think you should get these at $35 a piece
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=9351
with boost i would agree you should try to get a non-projected tip,
projected tip spark plugs tend to run hotter than non-projected tip all things being equal, however that doesn't mean you can't find a projected tip plug that will work. And since it's boosted, that generally requires reducing the gap because more voltage is required to jump the gap when cylinder pressures are higher, but fine-wire center electrode (iridium) plugs require less voltage so if you can find and afford them i would get those as opposed to traditional copper 2mm center electrode plugs.
you can get the master excel spark plug cross reference here
http://home.att.net/~ngkaz/wsb/html/...ome.html-.html
in excel do a Data - Sort on columns for reach, thread size, no for projected tip, and so on to narrow down what's available.
when i click on your summit link, it shows some spark plugs but i'm not sure if they're correct for that head. If they are, then you need 0.750" (19mm) reach plugs, having a 14mm thread size, gasket seat. And it shows it as a 5/8" (0.625") hex size for the spark plug socket, but if you can fit a plug having the larger 13/16" (0.8125") hex size then that will give you a lot more plugs to choose from.
For a non-projected tip, I'm seeing
NGK GR5 (#3430)
AC R42XLS, R41XLS
Denso W20EXR-U (#3066)
but since it's not my money, I think you should get these at $35 a piece
http://www.sparkplugs.com/more_info.asp?AAIA=&pid=9351
with boost i would agree you should try to get a non-projected tip,
projected tip spark plugs tend to run hotter than non-projected tip all things being equal, however that doesn't mean you can't find a projected tip plug that will work. And since it's boosted, that generally requires reducing the gap because more voltage is required to jump the gap when cylinder pressures are higher, but fine-wire center electrode (iridium) plugs require less voltage so if you can find and afford them i would get those as opposed to traditional copper 2mm center electrode plugs.
