Thread: Reading Plugs

I have been researching on reading plugs to make sure my motor was running ok. I changed the plugs last night and it seems i may have too much timing even though this is where it made peak power on the dyno. I will post pictures tonight, but everything looks good except for the ground strap, it is white/gray all the way to the threads which from what i have been reading indicates too much timing.

Here are a few links that i have been going off of.

http://www.boschautoparts.com/BAP_Technical_Resources%2FSpark%20Plugs%2FSparkPlugFaces.pdf

Spark plug reading

Anyone with input on our motors?

Post up what your plugs look like.

Here is NGK plug-reading "guide".

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp?mode=nml

Wanna see some of my plugs? I can PM them to you or whatever. plugs are plugs, section being VVL is meh.

This would be good info to see

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Please share the pics. More information is always better.

BKR6E plugs. Same engine. Differences are clearly evident. Let's see who wants to play the guessing game.



Here are nice macro shots of cyl. 2. I have each cylinder on macro from the orange set. I think I threw out the older set a while ago during a large clean-up.

The ones on the right appear to have been overheated. Even the porcelain on the top of the plug is discolored.

No overheating, just old.

Don't bother trying to read the plugs for timing if you drove it for more than one WOT pull. Timing is too dynamic. How would you know you have too much or not enough at 2k, 4k, 8k rpm by looking at the ground strap.? You don't. The dyno would the best tool to determine the timing. Don't know why you are second guessing the dyno.

The timing light at the crank pulley, laptop, dyno graph, and your hearing are better tools for determining the right timing.

You can also disregard all the pics you see from the sparkplug "guide". Never seen a sparkplug coming out of a VE or DE look like that. A well maintained VE, DE will leave little if any deposit on the sparkplugs.

I do however pull the plugs to check the afr and eveness of the cylinders. If one sparkplug looks different than the others, then you know to check that particular cylinder.





I"ll play. You got a neglected running DE. Need to change your plugs more often. It definately been misfiring and fouling. Look at all the raw fuel deposit and oil deposit, they look like sand specs. The white insulator should be white with no color. Your plugs are a good example of what you don't want.

Yepper at 13,000 miles on copper plugs and the misfiring was the seal at the distributor cap.

They look nice and purdy, like the old ones did now.