hey, i've been looking everywhere but i can't seem to find iridium plugs for the zetec. do they exist? if so, where are they sold? thanks.
eric
eric
ZX3Speed
Tom, this is the first time I've ever heard or read this. Everything I've read on every web site, and both performance shops I use (the guys who do my physical installs are old school, having done hot rods for 35 years) have highly recommended Denso/NGK iridium spark plugs for boosted Focuses (I've heard that there's no point on normally aspirated Focuses). These particular ones, anyway, are not designed for long life at all. Denso says to replace them every 30,000 miles because the very sharp tip wears out quickly.
What reasons do you have for believing them to not be a good performance choice? I'm genuinely curious--not trying to be a smart ass, or anything. I know that Autolite or Motorcraft plugs will last (much) longer, so I would not exactly be upset to learn that iridium plugs aren't worth it.
1. Focus comes stocked with Motorcraft Double-platnium plugs.
2. I've installed Denso Iridium plugs and have had no issues. Can;t tell the difference between stock on Denso plugs.
3. You can get a set of Denso plugs for about $40 on ebay.
2. I've installed Denso Iridium plugs and have had no issues. Can;t tell the difference between stock on Denso plugs.
3. You can get a set of Denso plugs for about $40 on ebay.
You want to stay away from the Iridium plugs.
Last year i asked my friends at ford Racing about them, they said they dynoed them and found no HP gain. so you are better off using stock plugs.
As Tom said about going with the Ford Motorcraft 22c plugs, these are 10 times better than anything else. They are one step colder and i run them in my car (I am not Boosted) and saw a 5whp gain from just the plugs. So I recomend them for anyone.
chris
Last year i asked my friends at ford Racing about them, they said they dynoed them and found no HP gain. so you are better off using stock plugs.
As Tom said about going with the Ford Motorcraft 22c plugs, these are 10 times better than anything else. They are one step colder and i run them in my car (I am not Boosted) and saw a 5whp gain from just the plugs. So I recomend them for anyone.
chris
I personally found that the iridium plugs made a huge difference in the turbo 180sx I had when I was stationed in Japan. It's application dependent. If your getting good, complete burn with Motorcraft, Autolite, etc... you are not going to see a benefit by switching and you are wasting your money. It's like using 92 octane when you don't need it.
I agree; however, to say that they SUCK implies more than just, "don't bother to use them for NA cars." I want to know how they suck. Should they simply not be used at all.
QUOTE,," because the very sharp tip wears out quickly."
Tip wear , wire wear(wire being the wire on the plug it self that coveres the electrode) cost , no gain in HP or TQ and dont like that in most cases you cannot get a cold enough plug and a to hot of a plug can cause deto
If these plugs are so good for boosted applications why in most cases do they not make a COLD plug
Tom
Tip wear , wire wear(wire being the wire on the plug it self that coveres the electrode) cost , no gain in HP or TQ and dont like that in most cases you cannot get a cold enough plug and a to hot of a plug can cause deto
If these plugs are so good for boosted applications why in most cases do they not make a COLD plug
Tom
i second the interest in the one step colder plugs- where can we get these? internet sites? local ford dealer? what's the part #? are these one step colder plus only good for boosted applications or will they benefit modded NA applications? thanks guys.
[quote
I thought colder plugs were only suggested for FI applications, not true??
[/QUOTE]
well that what people say that dont know any thing
just like poeple wince at a 3" exhaust on a n/a car
![Image]()
Tom adds them to N/A SVT's for 10whp. So keep on believeing
what people tell you with no actual experience.
I know Tom dynoed a custom colder plug he sells in a stock SVT and got 8whp
The ford motor craft is just one step colder. BUT REMEBER
in the 80', 70's there was no platinum crap
the ninteys is where the double platinums came in only to
burn hotter for better emissions and so you dont have to get a tune up for 100k
the colder plug guves a better spark and burns more fuel making more HP, instead of sending excess fuel to the cat.
CHRIS
I thought colder plugs were only suggested for FI applications, not true??
[/QUOTE]
well that what people say that dont know any thing
just like poeple wince at a 3" exhaust on a n/a car
Tom adds them to N/A SVT's for 10whp. So keep on believeing
what people tell you with no actual experience.
I know Tom dynoed a custom colder plug he sells in a stock SVT and got 8whp
The ford motor craft is just one step colder. BUT REMEBER
in the 80', 70's there was no platinum crap
the ninteys is where the double platinums came in only to
burn hotter for better emissions and so you dont have to get a tune up for 100k
the colder plug guves a better spark and burns more fuel making more HP, instead of sending excess fuel to the cat.
CHRIS
Fair enough, I was just asking geez...well that what people say that dont know any thing
just like poeple wince at a 3" exhaust on a n/a car![Image]()
Tom adds them to N/A SVT's for 10whp. So keep on believeing
what people tell you with no actual experience.
I know Tom dynoed a custom colder plug he sells in a stock SVT and got 8whp
The ford motor craft is just one step colder. BUT REMEBER
in the 80', 70's there was no platinum crap
the ninteys is where the double platinums came in only to
burn hotter for better emissions and so you dont have to get a tune up for 100k
the colder plug guves a better spark and burns more fuel making more HP, instead of sending excess fuel to the cat.
CHRIS
So where can one purchase such things?
Hmmmm never mind, I do see where I could purchase these...
This site has some good info on spark plugs for those who want to be informed.
http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp?nav=31000&country=
http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp?nav=31000&country=
sounds about right.
Conversely, a cold spark plug has a shorter insulator nose and absorbs more combustion chamber heat. This heat travels a shorter distance, and allows the plug to operate at a lower internal temperature. A colder heat range is necessary when the engine is modified for performance, subjected to heavy loads, or is run at high rpms for a significant period of time. The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and melting or damage to the firing end. (Engine temperature can affect the spark plug's operating temperature, but not the spark plugs heat range).
Conversely, a cold spark plug has a shorter insulator nose and absorbs more combustion chamber heat. This heat travels a shorter distance, and allows the plug to operate at a lower internal temperature. A colder heat range is necessary when the engine is modified for performance, subjected to heavy loads, or is run at high rpms for a significant period of time. The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and melting or damage to the firing end. (Engine temperature can affect the spark plug's operating temperature, but not the spark plugs heat range).
Motorcraft Copper plugs - AZFS-22C
these are available at some Ford Dealers, most wont have them, they are about $3-4 ea
chris
these are available at some Ford Dealers, most wont have them, they are about $3-4 ea
chris
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