Reading Spark Plugs - A Discussion
10-21-2015, 01:33 PM
#52
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Re: Reading Spark Plugs - A Discussion
Just wanted to contribute to this thread sinced it helped me. I did a 3rd gear pulled with one sparkplug ground tip sanded and one left alone. Here's my finding:
Cylinder #1 (Sanded Ground Strap) Grey Tip with Gap
Cylinder #3 (Un-sanded Ground Strap) Brown tip, No Gap
What i did was changed to new plugs at a secluded area & warmed up the new plugs for abot 5-10 min. Did a wot pulled in 3rd gear and shut off coasting to a safe stop area. Then read plugs. Needs more fuel & maybe 1*-2* advanced ignition timing. AFR was about 13.0
Motor: LS
B16 pistons
Crower 404 cams
Rev 7.8k
afr 13.0 @ wot
Cylinder #1 (Sanded Ground Strap) Grey Tip with Gap
Cylinder #3 (Un-sanded Ground Strap) Brown tip, No Gap
What i did was changed to new plugs at a secluded area & warmed up the new plugs for abot 5-10 min. Did a wot pulled in 3rd gear and shut off coasting to a safe stop area. Then read plugs. Needs more fuel & maybe 1*-2* advanced ignition timing. AFR was about 13.0
Motor: LS
B16 pistons
Crower 404 cams
Rev 7.8k
afr 13.0 @ wot
10-31-2015, 04:05 AM
#54
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Re: Reading Spark Plugs - A Discussion
so what if i cant see a change in color from golden bronze to blueish purple? i have the plugs sanded down pretty good but the whole ground strap really doesnt have a change.
04-16-2016, 03:42 PM
#55
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Re: Reading Spark Plugs - A Discussion
been doing this a while now, just making sure im looking at the right thing. the "color change" that denotes the timing mark, is that the first white to grey line thats right on the bend of the plug, or is it the grey to light grey line thats real close to the base ring of the plug? this plug was from a 3rd gear pull. i shut the engine down @wot at 6500 rpm and coasted off the road to check the plugs. there was evidence of detonation on the porcelain, from just below the electrode to just about where the porcelain goes down into the threaded portion. plug had maybe 15 miles on it and this was the first wot hit.
04-16-2016, 03:52 PM
#56
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Re: Reading Spark Plugs - A Discussion
been doing this a while now, just making sure im looking at the right thing. the "color change" that denotes the timing mark, is that the first white to grey line thats right on the bend of the plug, or is it the grey to light grey line thats real close to the base ring of the plug? this plug was from a 3rd gear pull. i shut the engine down @wot at 6500 rpm and coasted off the road to check the plugs. there was evidence of detonation on the porcelain, from just below the electrode to just about where the porcelain goes down into the threaded portion. plug had maybe 15 miles on it and this was the first wot hit.
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