Does anyone know of a good site to learn about spark plugs, or can elaborate on a few items?

I'm wondering how a spark plug's temperature range affects an engine's tuning, and how the placement of the electrode affects as well.

I switched from an AC Delco R44TS to a R45T (on accident) recently, and my engine has been knocking ever since. The R45T has a recessed electrode compared to the R44TS, and it's leading me to believe that I'm getting a double-detonation.

I'd really like to learn more about how the design of a spark plug affects performance and such.

Looking forward to your replies!

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70 Impala Sport Coupe (350)
67 Chevelle (I wish, still looking and saving)
http://www.geocities.com/ledsled_26m

NGK has a great Tech Info section on their site. http://www.ngksparkplugs.com/techinfo/spark_plugs/ All 3 links have great info...

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...Dennis
The '69 (http://chevelles.com/showroom/ww.jpg), the '96 (http://www.camaroslimited.com/graphics/memcars/96ss.jpg) and The El Camino (http://chevelles.com/showroom/DjD/dsc00016.jpg)
Team Camaro (http://www.camaros.net)
Camaros Limited (http://www.camaroslimited.com)

Excellent info, thanks!

Looks like a change to a colder plug with the correct nose length is in order.

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70 Impala Sport Coupe (350)
67 Chevelle (I wish, still looking and saving)
http://www.geocities.com/ledsled_26m

You might check this site out...
http://www.edelbrock.com/automotive/sparkplugs.html

It not only gives you a quick education on spark plugs (from Champion Spark Plug), but also has a link to information on which Champion plugs work best in high performance applications. Also, if you happen to know anyone at a parts store, maybe they could get you a Champion catalog. No matter what you think about their plugs, I think the information is the best in the industry.

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~moderation is great... as long as there is plenty of it!~

I've been thinking about this for a few days...and have some questions.

It seems to me like the NGK site has the cold and hot plugs switched in the diagram.

http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp2.asp

Seems to me that a plug with a more surface area exposed to combustion gases and the cooling passages would cool off faster, whereas the one on the right, having a smaller surface area, would stay hotter.

Also, why do their numbers go up as the plug gets colder, whereas an AC Delco, the higher the number the hotter the plug?

Hope someone knows!

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70 Impala Sport Coupe (350)
67 Chevelle (I wish, still looking and saving)
http://www.geocities.com/ledsled_26m

Ledsled,

The NGK #'s are right - the 10's are the coldest (I think they make one or two colder) and the lower #'s are hotter.

I know this because I was told to run R5671A-7's on motor, and R5671A-9's or 10's on nitrous. These are a non-projected type plug - what you are supposed to run with nitrous.

Their standard types are like B9ES, B7E3 etc.

edited out what i said before.. I'm going to have to re-think how i said that
Brandon

[This message has been edited by 70mousejob (edited 12-30-2002).]

Led - your answer is on the 3rd page ( http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp3.asp ). The last 2 paragraphs...

Yeah, checked out that Edelbrock/Champion page and it explained the hot/cold a lot better.

Thanks for the great links!