No denso. NGK only. NGK Platinum or Double Platinum are the best option.



Post Title:
Posted by: maxhopper97 at 10:19 AM 9/27/2006

- James



Post Title: Re: (jmaxima)
Posted by: Chris92SE at 9:33 PM 9/30/2006

If you do maintenance yourself, there is nothing wrong with using copper. The cars come from the factory with platinums, but that is for durability and so they can advertise longer periods between "tune ups."

I use coppers and I just change them more frequently. At about $15 a set for coppers or $75 for a set of platinums, it's easier for me to shell out $15 every year or so, instead of that big hit. I never really worry about them getting weak or having problems, since they get replaced before they wear out at all.

Also, Platinum is not recommended for use with nitrous, in case any of you are thinking of spraying.



Post Title: Re: (jmaxima)
Posted by: C-Kwik at 5:10 PM 10/2/2006

I recommend reading the following link and the iridium technical pdf and the the pdf of the mustangs and fast fords article at the bottom.

http://www.sparkplugs.com/spar...fid=0

To sum up though, iridium is harder than platinum. The problem with iridium lies in it's oxidation properties. The technical pdf will explain this in great detail. But denso uses iridium with a 10% platinum content to virtually eliminate the problems with oxidation. As a result wear is reduced. The iridium plugs do use a thinner center electrode though than platinum plugs. The advantage of a thinner electrode is that less voltage is needed to allow the spark to occur. With the harder, more wear resistant metals used, the plug will be able to last as long or longer.

There are exceptions however. Cars with coil packs spark once from the center to ground electrodes and then once from the ground to center electrode. For this reason, double platinum electrodes are used by OEM's that require platinum plugs. These will likely outlast most iridium plugs. Though NGK is starting to make double iridium for the OE applications that are starting to arise. I'm not sure if they are going to try and increase life further over Pltinum or simply increase performance by decreasing the voltage needed and/or widening the plug gap exposing more the the spark to the mixture.

Another exception may be the denso plugs. They use a smaller center electrode than NGK, which results in even better performance. Wear does not appear to be great, but better than a standard copper plug. The reduced wear comes from having less metal on the electrode.

I recently switched to iridiums. Admittedly, I was looking for platinums at the local auto store, but they were sold out. Iridium NGK's were the next best option. After a weekend of driving, I found they are smoother than the platinums I pulled out. The platinums didn't appear to be worn much, if at all. I did my iridium research after I bought them. According to a couple sites I found info at, single platinum plugs can be expected to last about 60,000 miles.

The impression I get is that iridium plugs are currently being produced mostly for a cood balance between performance and wear. Though the denso's may be even more towards performance. you can expect wear to be better than a standard plug.



Post Title: Re: spark plugs (Nedflog)
Posted by: NosKid_13 at 7:35 AM 10/3/2006

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