Spark Plug heat range
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Spark Plug heat range
Posted: March 16 2004 12:30 AM
 
Lyle D Reitmeier (aka lyled) [ View ] [ lyledavid@mei.net ] [ Car Ads ] [ Blogs ]
Battle Creek, Michigan
(269) 721-8082
 
I have a small block Chev Dart Little M block bored .030, 607319 Edelbrock Performer aluminum heads 70 c.c. Comp. roller cam, lifters and rockers. A BDS 671 blower with 2 Edelbrock 1405 600 cfm carbs and a Vertex Mag. The question is the Sparkplugs. I am running Champion RV15YC4 plugs and the color is black on the tip. Am I running the correct plug or should I go hotter or colder. The engine has about 1000 miles on it so it is new. What is the concensus of the experts out there? Where should I start? What are other Rodders using? Any help will be appreciated.. No racing street only.Lyled.
 
 
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Posted by rodsnhawgs  -  03/16/2004 12:01 AM

Ohhhh no, the question is not soley the spark plugs. Lots of variables in this equation and not enough information to make an accurate call (based on what you've supplied). First, you need to define the "black" on the tip and where exactly is it black? Is it black soot or shiney black (which could mean an oiling situation)? Is it black uniformly or on one side of the plug? Are all the plugs blackening the same? Second, what is your cam profile like? Is that critical component matched well with the rest of the engine and more importantly, matched to what BDS recommends? Third, what is the final compression ratio? Is the blower neutral, under or over driven? Are you running both 4s or running progressive linkage? Is the fuel curve correct for your street application? What RPM does the engine live at most of the time? Do you find the engine "loading up"; overheating; detonating; etc?



It looks like those Champions are a pretty generic plug for 350 Chevys - probably a good place to start. Assuming your mag is working correctly, the problem is more likely to be component (mis)matching or fuel and/or oiling related. After all other variables are "dialed in", then the discussion can turn to plug heat range changes. Give us some more to go on and we may be able to lend you more help.
rodsnhawgs [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint albans, West Virginia Charter Member since August 2001
 
Posted by gm34  -  03/15/2004 09:34 PM
Either too cold or too much fuel, or a little of both. They should be a very light gray.That assumes good spark and no ignition problems.
gm34 [ View ] [ Email ] [ Blogs ] [ Car Ads ] (location not given)
 
Posted by rodsnhawgs  -  03/16/2004 12:30 AM
A side note: you probably already know this but be sure to use anti-seize on your plugs in those aluminum heads or you'll eventually be spending a bunch of $ on head repair work.
rodsnhawgs [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint albans, West Virginia Charter Member since August 2001
 
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