Paul you might catch a bit of flack here?
I have 2 opinions based on Science and Realworld testing

1: Iridium and Platinum are not even close in comparison? So how can the same theory exist for Iridium and Platinum?
Science
First Platinum:
Kpsi:20 HV(hardness):40 Electrcal Resistance:4-11/64 degF 3120
sec Iridium:
Kpsi:159 HV(hardness):240 Electrcal Resistance:2-3/32 degF 4400
As a conductor Copper is not even in the same league. Here is the resistance of Gold 29/32. please agree aleast Gold is a better conductor then copper?

There is also plug design which is probably the most important part when you consider blown applications alone.

Quote
Advantages of the Iridium spark plug;
Because of the properties of Iridium, the spark plugs centre electrode can be made with a much smaller diameter than with platinum types (usually 0.8mm for NGK and 0.7mm for Denso), Gold or gold palladium and copper/nickel types. This means that spark plugs potential difference is more concentrated and hence less 'spark jump' voltage is required - this can be as much as 5,000 volts less than with standard plug types. Ignition is improved and less strain is placed on the ignition system. Benefits of improved ignition/combustion include better fuel economy, increased power/acceleration and especially better throttle response.

2 Realworld:

Numerous, numerous times customers have swaped copper to iriduim for high boost applications due to spark blow out with copper types. Yes with the right range and gap there was still misses/drivability issues problems.
Do a real world test 42cc/20psi at 35tho. use both plugs Iridium vs anythnig you want copper/anything see which one blows out first? see which makes it 2K.....

The best tuners in the World swear by the results of these plugs..Chev/Dodge Ford/Import it does not matter. We use what works and I would not be spending $12 to 15 bucks a plug if these did not work! and work GOOD! would you?

To all just feedback and nothing more.....................we are all here to learn from each other share our knowledge..I learn everyday! :cheers:



2.

I guess I was wrong about the iridium...no fault in admitting that. You might have me beat on the scientifics, wont argue with you there :banghead: and to be honest I have never personally seen the results of Iridium plugs. I use what i KNOW works time and time again.

But I do know that you can't find a better plug for a blower car....it has been proven time and time again they are the best plugs for the job..and this is based on real world testing..no numbers. That comes from me and probally the 5 best tuners in the world who happen to work/operate SCT.

I have seen too many issues on power adder cars with non copper plugs...

my father have vortech 95' 5.0l , autolite plug is the right plug for is 7lbs vortech ?

I only use Motocraft Plugs for all power adder applications....there are some MINOR exceptions but they are always copper and 1-2 heat ranges colder.

I would use a AWSFA-22c or 12c for that application.

Thanks for the advice :tup :tup

Hands down, best plug for boost application is Irridium. On dyno with Motocraft Coppers, gapped at .030" at 5800rpm @ 18psi the copper plugs fail to light. Switch to NGK Irridium plugs gapped at .030" 637rwhp stay lit right to redline. Easy descission in my book. On a N/A applictation, unless you are running high comp with pump gas, I would stick with platinum. Will last WAY longer.

I guess everyone has their own opinion on what works. This is good, because without opinion and options what would this world be? We both provide great results with different combinations...that is what this indsutry needs...choice :cheers:

We have built cars from 300-800rwhp and used coppers with no problems. Same goes for Jerry W, Chris J and the Entire JMS team, Don Lasota (all the big boys). The car's that came to me with Iridium plugs, I did not like how the ran and reacted.

Maybe one day I will give a set of iridiums a try in my cobra. :tup

As far as Plat's lasting longer, they will. But I say get over the extra cost, which is minimal and use a copper plug.

Copper is a better conductor of electricity than platinum, but at a cost....it wears out faster. Going fast takes money...if you want the motor to run well all the time these things need to be done.

2003 Mach 1 The engine makes use of a 10.1:1 compression ratio and has specially calibrated camshafts.....

stay with what I got or switch to Iridium? Thanks

Venom is our Club has the dyno sheet to show the difference between copper and Iridium in his 03 Cobra...there was a gain of 8RWHP from the Iridium plug...now keep in mind they were cresting the 500rwhp mark...but he's convinced...they spent hrs on the dyno trying different applications.

I am running the AWSFA12C plugs...just ordered a new set today, and I have had no troubles at all in my Vortech blown GT.

These are the 2 steps colder than stock.
~Darren