I was told, by a GM dealer (I wasnt impressed) when I went to get a Z-Bar for my car... that:

ANY Precious medal plug (I.e. NGK Iridiums, BOSCH Platinums, etc...)

Will MELT under the high-voltages of an MSD setup..

He also mentioned that the STOCK LS-1's come with a platinum plug, and a REAL hot ignition to begin with... and THATS a mistake on GM's part too! Its not just the MSD ignition.. its ANY high power ignition he said. it can melt the precious medal. or destroy the plug.

 

I've heard that before too. I just stuck with AC's and they have been good for th elast 3 years.

 

I ran platinum plugs for over a year with the MSD 6al and MSD coil on the car. They were still good when I pulled them out.

 

I ran a MSD 6AL/ Blaster coil and MSD distributor and in 3.5 months I ended up melting the electrodes on platnium plugs so that they were not lining up straight. I personally think platniums are over rated. But then again I do major tune ups on a yearly basis.

 

so they DO melt. somtimes.

heh, imma throw some into my digital 7 ignition setup and see what happens. i bet they melt in 2 hours

 

I don't suggest trying to melt them..I would replace them first...Think of it this way..you know they can and probably will melt..Small piece falls off plug , get wedged between the face and the seat of the valves. make little indent...Uh OH why isn't my car running right????? Change them first..Try the plain old AC Delcos should work great for you. Better safe then sorry. HTH

Keiran

 

i was kidding. heh. the 7-digital is for sale on ebay, not in my car. and i dont own any platinum plugs.

I DO however own iridium plugs, and wanted to use them. but now im scard..

heh thanks for the warning kaz, but i would rather not let a $20 set of plugs ruin my $5000 engine.

now THAT would be a total

 

LOL! I didn't think you would do something like that...but who knows?? Not trying to say you don't know what you are doing either, just wanted to make sure, that's all. Good thing you just kiddin.

 

I know that with my Jacob inginition they don't want you running any precious metal plugs. I can't exactly remember why though.

 

I agree...

 

platinum is supposed to have a very high melting point so im not convinced... yet...

 

<b>platinum is supposed to have a very high melting point so im not convinced... yet...</b>

I was told its not the HEAT its just the High POWER of the ignition, the massive resistance that builds up or somthing. i mean, its like forced induction.. sort of.. your forcing a hotter bigger badder multiple spark through the same size plug and thus i guess bad things can happen...

I will ask more people. I wonder what a ford dealer will say.

 

From all I've heard, hot ignitions WILL screw up platinum plugs..the electrodes just cant handle it... Iridium SHOULD be fine though, I would think, unless the electrode is tiny. Iridium has an extremely high melting point...stuff's crazy. There are reasons it's so expensive..

 

Not sure whats in ac rapidfires but I tried them with my msd6a and jacobs ultracoil and they sucked.. Took em right back out without leaving the garage it ran so poor.. Put them in my chevelle with stock points and it ran fine. I think most aftermarket ignitions are "tuned" to a certain resistance. When you change that it throws out the tuning.

 

I've been running NGK V-power plugs and an MSD 6a with a blaster coil for over a year now. No problems yet.

Actually, I don't think V-powers are platinum.

 

Copper has a molecular weight of 63.546g/mol and a melting point of 1083 °C, platinum has a molecular weight of 195.08g/mol and a melting point of 1768.3 °C. Thermal conductivities are 72 and 400W/m*k, respectively. Platinum has a density of 21090 kg/m^3, copper 8920kg/m^3. From the data I got from my properties of chemical elements book, it seems that platinum would be much stronger, but not conduct as well. Now these are only pure elements, while spark plus are probably alloys (platinum is normally mixed with iridium, I believe). Perhaps the lower conductivity has something to do with platinum not working well with high voltage, or maybe it could possibly react with some component of combustion and break down. I don't really know, maybe Vader can inform us.

 

Tell yah guys what I will do. I have 8 plugs that are hooped and if you send me $10 Ill mail you each one! LOL. I just have experienced this and if you want to beleive me great if not go throw your money away or like I said mail me your money.

 

what are you saying that the platinums melted with the MSD ignition? just take a few pics

 

With a multi strike cd ignition like the MSD, platinum plugs are
absolutly unnessessary. They run hotter too. ( heat range)
that is what makes them last so long. The hot tip burns off fuel deposits.

That is what destroys them (with a MSD). Too hot a heat range.
Works well for a every day grocery getter but not a performance/race car that will see lots of WOT time.
Just use low buck every day normal spark plugs. Select a slightly cooler heat range for hard performance driving and/or a power adder.

The 7 series MSD ignitions are just too hot for a every day street car. Just plain overkill. You can expect some loss of usefull life of the whole secondary ignition system parts because of this. You'll be replaceing theses parts more often.