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Gas Mileage Increase from Spark Plugs?


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jtz54
Novice

Jul 15, 2005, 10:54 AM

Post #1 of 9 (50734 views)
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post icon Gas Mileage Increase from Spark Plugs? Sign In

I normally won't post stuff like this but seeing how gas prices are these days...

http://www.supersonicspark.com/

My friend told me about these plugs. He told me his gas mileage went up by 8%-10%. Having bought quite a few of these
including Tornado and fuel line magnets and finding none of them made a damn bit of difference, I was very skeptical!!!

I put these in my 2000 Suzuki Grand Vitara 4WD Auto which was averaging 19-21 MPG. I went through several tanks before I concluded that these things do make a difference now averaging 22-23 MPG. A couple of weeks ago I put in a new set of Bosch Platinum 4 plugs and my gas mileage went back down to the 19-21MPG as before. I originally changed out the Supersonic sparks because my gas mileage had dropped and my friend had told me when the plugs wear out I would notice the difference (but it wasn't the plugs but the fuel filter, hey I hadn't changed ever with 100K+ on the car).

Anyone want to try these out and let me know your results. They're only $5.95 for most cars so the guy isn't trying to screw anybody.

PS
When I took the two Tornado back to the dealer they just gave me my money back with no questions or even try to explain why it didn't work.


Guest
Anonymous Poster
smokeajaday420@yahoo.com

Apr 16, 2006, 8:56 PM

Post #2 of 9 (49404 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

i own a 1988 Ford Mustang coupe lowrider..and i wouldnt dare to put those in my car.....i use only motorcraft...and my "stang" gets 28/36 mpg


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 18, 2006, 10:39 AM

Post #3 of 9 (49399 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

Spark plugs should stay as factory recommended. They won't get you more power or better gas mileage. Trust me -- an auto maker would have used them to brag about the HP or mileage! T
_________________________________________
Long retired now


Guest
Anonymous Poster

Feb 21, 2007, 10:22 AM

Post #4 of 9 (48921 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

Can you say *bogus* ? "Let me sell stuff by posting them on a blog so people will be misled into buyinh them..." Sorry, not for me.


carjunky
Enthusiast

Feb 22, 2007, 12:38 PM

Post #5 of 9 (48917 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

LOL... I agree if they really did work we would have gotten an email to try them out and write a review for them. when it comes to engine internals its difficult to stray outside of a name brand company... i would hate to see what would happen if that little attachment with the whole in it was to break inside your car....


(This post was edited by carjunky on Feb 22, 2007, 12:38 PM)


Daggar
Anonymous Poster

Jun 19, 2008, 1:54 PM

Post #6 of 9 (45233 views)
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Actually, this isn't as hard to believe as some have made it out to be. The only caveat is that this same seemingly, remarkable feat can be accomplished with your regular ole run-of-the-mill spark plug.

1. Take your favorite brand X spark plug
2. Cut the grounding strap down so that it covers just half of the electrode when looking straight down on it.
3. File the corners of the grounding strap to make the ground strap round.
4. With a set of gapping pliers (do not beat, bag, or bend the grounding strap), properly gap the plug.
5. INDEX the spark plugs so that the open portion of the electrode gap faces the intake valve (google "spark plug indexing" if you're unfamiliar with this).

Whola! There's no magic potion. There's no "Supersonic" atomization of fuel particles, no Holy Grail spark plug. All this spark plug has done is unshroud the electrode so that more spark surface meets more of the air/fuel mixture.

Does it do what they say it can do whn compared to an out of the box spark plug? Probably.

Does it do it because of the reasons stated on the listed website? Not.

Can a cheapo set of OEM spark plugs accomplish the same thing? Yes.... and done correctly will net a better result.


Daggar
Anonymous Poster

Jun 19, 2008, 2:05 PM

Post #7 of 9 (45232 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

By the way....

I've personally participated in a 7 rear wheel horse gain on back to back dyno pulls that resulted from properly indexing a set of spark plugs. No work had yet been done to the grounding straps at that point.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jun 19, 2008, 9:06 PM

Post #8 of 9 (45226 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

Race cars techs have been indexing plugs since the beginning of time. It can help especially with higher RPM use. It's not all the easy with "taper" seated plugs though..... too loose, too tight?

T
_________________________________________
Long retired now


Daggar
Anonymous Poster

Jun 23, 2008, 8:27 AM

Post #9 of 9 (45150 views)
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Re: Gas Mileage Increase from Spark Plugs? [In reply to] Sign In

It's not as easy as it is with "ringed" plugs but you can by shims that fit over the plug. They work similar to crush washers but CAN be overtorqued and torn.




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