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Reading Spark Plugs - A Discussion

 
Old 10-20-2015, 07:20 AM
  #51  
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Bye

Last edited by turbohatch96y7; 03-02-2016 at 08:18 PM.
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Old 10-21-2015, 01:33 PM
  #52  
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Default 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
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Old 10-29-2015, 07:45 AM
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You need to sand the tip down more. Needs to be bare metal. You still have the coating on the tip in both pics
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Old 10-31-2015, 04:05 AM
  #54  
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Default 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.
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Old 04-16-2016, 03:42 PM
  #55  
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Default Re: Reading Spark Plugs - A Discussion

Originally Posted by blackeg View Post


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.
Will usdm prelude sh manual ecu be compatible with a usdm base prelude manual model?????
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Old 04-16-2016, 03:52 PM
  #56  
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Default Re: Reading Spark Plugs - A Discussion

Originally Posted by blackeg View Post


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.
Will usdm prelude sh manual ecu be compatible with a usdm base prelude manual model?????
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Old 04-17-2016, 06:20 AM
  #57  
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Default Re: Reading Spark Plugs - A Discussion

Originally Posted by elputipuerco View Post
Will usdm prelude sh manual ecu be compatible with a usdm base prelude manual model?????
Not sure what this has to do with reading spark plugs though????

But to answer your question, No it is not compatible!
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Old 07-20-2016, 11:38 AM
  #58  
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Default Re: Reading Spark Plugs - A Discussion

What you thing about this spark plug?


Last edited by Roy Leyva; 07-03-2017 at 07:32 AM.
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Old 01-17-2019, 07:13 PM
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Default Re: Reading Spark Plugs - A Discussion

Thank you for the info!
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