Spark Plug Modification has anybody done this?

http://performanceunlimited.com/documents/plugsidegapping.html

 

I have not done this, but i think i will try it

 

There was an article in one of the GSXTRA's magazines some time back where there were some AC Delco spark plugs that were "clip-gapped" as you describe in that article,and it even had instructions on how to do it...It appears that that idea was already explored for the BBB.Not to re-invent the wheel,but GREAT IDEAS seem to be done with the BUICKS.:TU: Jay B.Britt,Jr.

 

are there back to back dyno pulls that show a power increase?

 

I like the price. :dollar:

 

Thats the way the race plugs I buy come from the factory. I run ngk #9 race plugs and when I was running Champion c63yc before they were done that way also.

 

I have been dooing this for years. i just bought regular AC plugs and modify them this way

 

I too have been doing this with standard AC plugs and running them at the track, lots cheaper than buying racing plugs!

Anyone use the AC-LTS plugs? The threaded portion is quite a bit longer and takes up a little more room in the combustion chamber. I haven't had any problems with them hitting the pistons, but I haven't decked the block or shaved the heads.

 

Rubbish!!

 

Dave, tell us how you really feel

 

Did mine like that a few years ago and there still in there working,whether it helps, who knows but it seemed to make sense and there lasting.It would prob make more of a diff in an iron sb chevy due to its inferior combustion chamber design wich is more sensitive to plug indexing

 

That modification is actually called "J-gapping", originally done by drag racers, and has been around since the late 1950's. The name came from the look of the negative electrode after modification, looks like the letter "J". It's sole purpose was to unshroud the spark between the electrodes. This modification doesn't last too long on street engines before more maintenance of both electrodes has to be redone, though. On some engines that weren't tuned very well, results were positive, on engines well tuned, not so much as far as performance gains. We never used this modification in street driven engines.

Regards,

Milton

 

AC made a plug called "Daytona Special" that had the same configuration. I don'y know whether it made a big difference or not, but they must have had some reason for doing it

o No: o No: o No:

 

Tried it 10 years ago or so on Mandys Stock Appearing GS, back to back to back test, 0 gain.....

 

So I should put the dremel tool away!!

 

from what i understand about the whole modification, is it works best for power adder cars, it keeps the ground strap from turning into a glow plug, pre-detonating the mixture and wiping out the plug, or worse. my brother does this on his car with 26 psi of boost, and the plugs last a whole lot longer. Car Craft used autolite race plugs with the mod already done to run e85 and a blower.

 

Autolite race plugs I have used for years have this. It is nothing new. Been around for 40 years or more. With the ignitions we have today, I doubt it is a big deal.
Jim N.

 

My plugs are done like this. I never did do a before and after comparison though.