Fuelly Forums - Spark plug mod

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Quote:

Originally Posted by onegammyleg

Why not use plugs with open electrodes.

I have used Magneti Marelli 4 electrode splugs extensively in performance applications.

Or you can use these..

https://www.sianghin.com/products/ign..._plugs_big.jpg

But I have not seen an ounce of FE improvement.

Mainly because the NGK are 1.98 for each plug.:D

I think Ill try this trick. The engine has been missing once in a great while, so it looks like Im going to replace all that fun stuff, and I might as well try modding the plugs. :)

c8089923: the new spark plugs should take the same size wrench as the old ones.

I've tried the open electrode spark plugs, and noticed little to no positive affects in any of my japanise designed engines, altho I hear they work great in amarican made engines.

Quote:

Originally Posted by zpiloto

Mainly because the NGK are 1.98 for each plug.:D

The race plugs I used were about 7$ each but this was quite sum time ago.
The cost didnt bother me , I didnt pay the bills out of my pocket.
We used normal plugs after that.

Diamondlarry did a spark plug comparison test a while back (but i can't click to zoom in on the results):

https://www.gassavers.org/showthread....park+plug+test

Quote:

Originally Posted by kickflipjr

Diamondlarry did a spark plug comparison test

Yeah , same opinion as mine.

For the same money you could buy some corplast sheet and do some aero-mods and see a real benefit.

Quote:

Originally Posted by kickflipjr

Diamondlarry did a spark plug comparison test a while back (but i can't click to zoom in on the results):

https://www.gassavers.org/showthread....park+plug+test

It's in kind of an odd format but here it is.

Quote:

Splitfire Triple Platinum

46.7 mpg
11.9 seconds

47.2 mpg
11.51 seconds

47.0 mpg
11.4 seconds

50.1 mpg
10.7 seconds

46.9 mpg
11.44 seconds

47.7 mpg
11.7 seconds

NGK regular

46.7 mpg
13.19 seconds

46.54 mpg
12.46 seconds

45.5 mpg
12.24 seconds

47.5 mpg
12.82 seconds

47.7 mpg
12.34 seconds

44.7 mpg
10.16 seconds

E3

46.5 mpg
13.64 seconds

46.3 mpg
11.52 seconds

45.7 mpg
10.74 seconds

44.8 mpg
10.74 seconds

46.6 mpg
11.72 seconds

47.7 mpg
12.10seconds

Torque Master

46.4 mpg
13.76 seconds

46.43 mpg
11.7 seconds

45.9 mpg
11.46 seconds

46.6 mpg
12.37 seconds

47.4 mpg
11.29 seconds

46.3 mpg
10.73 seconds

Bosch Platinum +4

46.1 mpg
14.25 seconds

46.3 mpg
12.65 seconds

46.6 mpg
12.79 seconds

45.7 mpg
11.54 seconds

46.5 mpg
12.54 seconds

46.3 mpg
12.63 seconds

I took the highest and the lowest mpg and times and discarded them to come up with an average for each plug in each category. My tests indicate that the only significant increase was with the Splitfire Triple Platinum plugs. It also shows that mpg actually decreased with the E3, Torque Master, and Bosch Platinum +4 plugs. According to the Splitfire website, their plugs sell for $5.99/plug. My conclusion: While Splitfire Triple Platinum plugs do give slightly increased mileage, it may not be worth the added cost.

Quote:

Originally Posted by zpiloto (Post 13132)

No you drill a 1/16" hole in the bonding strap above the electrode and then dish the electrode a little so that when it fires the spark will go through the hole in the bonding strap for more spark front. There's pictures in the link. It an interesting idea, granted that there is only 2-3% to be gained in this area but every bit helps.

The link no longer works. I have heard of people doing this before, but never knew exactly how it was done. Does the hole go directly above the electrode? What do you use to dish out the electrode?

The web archive caught a copy of the article, but not the pix...
https://web.archive.org/web/200603150...id=31&Itemid=2

Lowering your gap from stock is like advancing your timing because of the lower voltage requirement.

Drilling a hole in the ground strap only serves to give a better 90 degree angle for the spark to jump to, lowering required voltage to fire the plug, and, again, advancing your timing. The spark won't fire through the hole either, it'll fire to the point of least resistance (closest point), the bottom near the electrode.

Increasing the voltage(or gap) will give you better ignitabillity when you go into lean burn. What you really want though is more current to the plug. Automotive ignition systems are grossly inefficient.