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post #1 of 10 (permalink) Old 11-16-04, 10:09 PM Thread Starter
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Spark Plugs - reading them (too lean?)

I took the plugs out of my clevo today, theres some links to the pics below...
To me they seem a little bit light in colour, just wondering what others opinions are.
(one plug is slightly wet, so i've put a new set in and will get some leads in the next few days)

http://www.pentagon-its.com/pics/plugs1.jpg
http://www.pentagon-its.com/pics/plugs2.jpg
http://www.pentagon-its.com/pics/plugs3.jpg


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post #2 of 10 (permalink) Old 11-16-04, 11:51 PM
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Re: Spark Plugs - reading them (too lean?)

From what I can tell. Pitty the pics are blurry. It looks a tad to lean but not much. The blacken plug (pic1) is either faulty, fouled or the cylinder has issues with the rings, valve stem seals or guides.

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XB Fairmont (street car) 11.07@123.02mph.
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post #3 of 10 (permalink) Old 11-17-04, 12:30 AM Thread Starter
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Re: Spark Plugs - reading them (too lean?)

yeah, had a feeling its a bit lean, but anyway the manifold is coming off over the next few days, it has sucked the gasket in on the no. 5 port. (that plug was white) This might also be a good excuse to put a kit through the carby, and increase the secondary jets a size or two.
The back two plugs were wet, but it is fuel not oil, i've put a new set of plugs in and will get a set of leads shortly then see how it goes from there. New plugs alone, today, made a bit of difference in responsiveness - using a 38 thou gap.

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post #4 of 10 (permalink) Old 11-17-04, 01:06 AM
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Re: Spark Plugs - reading them (too lean?)

Looks like the plugs are to hot and if anything its rich, forget the porcelain it has nothing to do with the mixture
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post #5 of 10 (permalink) Old 11-17-04, 02:12 AM
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Re: Spark Plugs - reading them (too lean?)

Quote:
Originally Posted by 4vxc
Looks like the plugs are to hot and if anything its rich, forget the porcelain it has nothing to do with the mixture
How do you work out white plug electrodes are rich?? Common sense tells you a white electrode is lean.

With LRP the electrodes generally red/orange due to the additives.

With unleaded it's either white (lean), creamy colored correct mixture or black (rich).

Same goes for leaded fuel but since it's not available anymore it's not an issue.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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post #6 of 10 (permalink) Old 11-17-04, 03:18 AM
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Re: Spark Plugs - reading them (too lean?)

4VXC is correct. You read mixture off the metal ring at the base of threads, not the porcelin. You view the porcelin for signs of detonation.
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post #7 of 10 (permalink) Old 11-17-04, 03:21 AM
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Re: Spark Plugs - reading them (too lean?)

ps
You can only read brand new plugs after a "clean cut". You want to be reading main jetting, not idle mixtures.....
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post #8 of 10 (permalink) Old 11-17-04, 04:32 AM
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Re: Spark Plugs - reading them (too lean?)

Your plugs look a bit on the yellow side.My plugs are pretty white by comparison. The whiter it is the leaner the mixture.It is supposed to be a light tan colour.
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post #9 of 10 (permalink) Old 11-18-04, 01:41 AM
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Re: Spark Plugs - reading them (too lean?)

Thanks Racer, that white porcelain makes it easier to see if it has been detonating (pinging) other than that it dosent tell you much. Brenden, you should be checking your plugs when you run your car at the drags next time, the metal ring IS the only way to read mixtures as Racer said dont risk youe motor by doing it any other way
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post #10 of 10 (permalink) Old 11-18-04, 03:33 AM
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Re: Spark Plugs - reading them (too lean?)

I check mine via an O2 sensor on a dyno. That way I don't need to change anything @ the track. As I run exhaust on etc etc. Street legal apart from my slicks.

Brenden

XB Fairmont (street car) 11.07@123.02mph.
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