Some of you seem to be confused as what spark plugs to use, this might help.. this is a tech article i wrote for clubsi...
Simple physics and logic dictate these conclusions. What say you?
Electricity, by its nature, flows along the path of least resistance.
What does this mean exactly? It means that, generally speaking, multiple grounds such as the BOSCH +4 and Zex plugs are useless.
Why? Simple.
A. terminal
B. ceramic insulation
C. center electrode
D. gap
E. ground electrode
Say this spark plug has multiple grounded electrodes, like a +4.
Now say, it is in an engine and is about to fire.
The spark energy flows down the center electrode, out into the gap and onto the closest (remember "path of least resistance"? ground.
This pattern will then repeat over and over for the entire life of the spark plug. That means the spark will hit the same ground EVERY time unless the grounding becomes damaged or so corroded its proximity to the center electrode is no longer enough to make it the least restrictive path for the electricity. In that case it will move onto one of the other grounds.
And that brings us to the only plus of having multiple grounded electrodes. Fact of the matter is though, unless you dont plan replacing your plugs between 100K mile intervals you will never need the extra grounds.
This is one of the reasons why cars advertise "no tune ups before the first 100K miles".
Personally, because I run nitrous, I change my plugs with every oil change.
The same goes for platinum and iridium plugs. These dont offer better performance. They just last longer. Another "100K mile tune up" deal. Under normal driving conditions the center electrode made out of these harder materials will, of course last longer. Because as we all know its so costly to change spark plugs at 60K miles, this is a must have, right? Pfff.
The ONLY reason why dealers recommend these plugs and why manufacturers put them in their cars is for that reasons and that reason alone.
Now, for high compression, turbo, and or N20 applications PLATNUM AND IRIDIUM plugs ARE NOT GOOD. The center electrodes will actually crap out much faster then your standard core electrodes under those conditions, especially N20 applications. Ive seen many a nitrous'd car running Denzos pop a plug. Trust me on this one.
And for the record ZEX SUCKS ASS!!!! Yes, thats right. ESPECIALLY their spark plugs.
How do I know this?
I bought a set. Not only are they 2X as expensive as the NGKs I use now the crapped out on me.
Three sub 15 second runs on brand new Zex plugs (on just a 50 shot mind you) resulted in one SEVERLY melted #3 plug. And I mean SEVERLY. All 3 ground electrodes were carbon coated, the center electrode AND the protective ceramic coating were melted and vaporized completely through. Thankfully there was no engine damage, but thats not the point. For a full year after that I ran the EXACT SAME set up with my NGKs, and had NEVER had a problem. Not once. Whats that mean? Its obviously not a mechanical or installation problem with the nitrous or fuel injection, rather its solely the fault of the plug.
PIECE OF SHIT
Plus Zex plugs are made in France. That should tell you enough.
Oh, and what do I reccomend for Nitrous and turbo applications? NGK-BKR7E (8E's for apps that call for 2 steps colder over stock) thats what. 2 bcuks each (high end) and are t3h b3st.
Re: Spark Plugs and nitrous READ!
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