#6 spark plug looks ugly

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Jul 25, 2005 | 10:33 PM

djxib

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Joined: Oct 2004

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#6 spark plug looks ugly

At the risk of not wanting to hear what you guys might advise (i.e. $$$$$ worth of fixes) - here is what I found Saturday. I changed the plugs on my '92 supercharged LT-1. They all looked to be overheated (ash gray coloration). However, #6 plug was in worse state - the ceramic had split and the electrode was burnt down.

My theory is that the car ran too hot for a few months because the alky injection nozzle was clogged (now fixed). So I am going to inspect #6 in a few weeks and see what it looks like.

Question - is #6 susceptible to overheating in the LT-1?

Thanks!
Andy.

Jul 25, 2005 | 10:52 PM

tjwong

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Joined: Jan 2003

Posts: 8,596

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From: Portland Oregon

Quote:

Originally Posted by djxib

Under normal conditions there are no lean cylinders in a LT exngine. The problem comes when tuners would add external enrichment to the engine to compensate for boost. GM designed the intake to be a dry intake meaning that there is just air flowing through the intake. Introduce fuel or alcohol into the plenum and now you are trying to convert the intake to a wet intake. Seeing how it's designed for just air, now you will get some cylinders that are lean and other rich, especially since that most alky systems I have seen uses a oil burner jet to introduce the alky solution into the front of the intake. I can say that it does work to suppress detnonation, just make sure that there is adequate flow to cover all the cylinders, so that even the lean ones are rich enough and that the ones before that are rich are just richer.

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