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#1
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Is this plug too lean?
I pulled this out of my 340 after about 3,000 miles. I'm running a 6bbl setup with 10:1 compression, 340hp manifolds and the center carb is jetted with #64s. The car runs great, but I think this looks too lean. Am I right?
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#2
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looks good to me, you want to look at the ring at the base of the plug.
as you can see it looks gray,which should indicate a pretty good setting. are you encountering any surging while driving ? |
#3
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just a bit lean I'd say.
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#4
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After 3000 miles and your plugs look like that and you say there isn't any kind of detonation and it's running great I say that's not bad. ( Maybe a bit lean). Here's a link to reading plugs.
http://www.4secondsflat.com/Spark_plug_reading.html http://www.strappe.com/plugs.html http://www.4secondsflat.com/plug_chart.html |
#5
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When I first got the car running the center carb had #61 jets and yes the engine surged at cruising speed. I read that the SB 6bbl setup should be jetted with 63s or 64s. My last tank of gas I did have some detonation but that went away with some Sunoco 94. That's the only time It has knocked. If I were to jet it up a bit, should I go up 1 or 2 sizes?
Thanks for your input. |
#6
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I'd try just one more size up. Your real close now. 2 sizes up might just be a waste of fuel.
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#7
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I think its lean, and not just a bit too. Should be tan looks more like off white to me, and should get tan after a few minutes of running too, it dont take 300 miles. Its always best to be a on the rich side than lean, your engine wiull like it too!
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