iridum plugs
- Thread starter Doc90
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bryce93lx
Member
From what i have gathered they will cause nothing but problems, the platinum plugs do and i think the irdidum will as well, the computer does not know how to deal with the way they burn, autolight 25's(or equivalent) are really the only way to, just good old fasioned plugs you can search to verify this
i think that the iridium (or platinum)plugs actually take more energy to fire and this isnt a problem in newer cars (and the plugs last an assload longer) with higher energy ign systems but in our old hei systems the plugs do not perform as well as a plug that was made for lower energy ignition like autolite 25's etc
DouglasOhio said:
+1
The 5.0's ignition was designed to use copper plugs, so putting in plats sometimes can have negative effects.
The new Mustangs (and other cars) run plats from the factory, but they also usually plop a COP on top of the plug. It's easy to run plats when you have a nice powerful coil sitting on top of each one.
Keep in mind that firing characteristics between iridium and platinum vary just as much as do cipper and platinum. They're all designed to fill a niche or application. Now there are even newer designs that have iridium cores with copper overlay. Spark intensity, surface area, and dispersion, are what should help decide what plug you need. There is usually some pretty good writeups from the various manufacturers on what their latest and greatest spark plug is supposed to be good at. If not, there are a few nice tech articles I've come across that are pretty good. Next, I may try the iridium/coppers that I mentioned. They seem (so far) to have the best of both worlds.
big blue
Founding Member
Just put them in my car. Barely noticeable power, though the car does gett better fuel mpg than before. All stock except exhaust and 3g upgrade(down to air silencer).
bluevenom867
I will have images of molesting stuffed animals in
DMAN302
My mom says thanks for the pearl necklace.
Question for Rick...have you had any success with cutting back the strap on plugs? I forget the correct term or this (indexing) but I know autolites can be purchased with the strap cut back. Curious how this might benefit a mildly moded 302 running stock ignition and .054 gap.
We've run the AR series plug from Autolite that has the strap cut back, saw a few HP on the dyno on back to back pulls just by changing the plugs. I've never cut them back by hand but it can be done...
The car we ran them on was a NA 308 that made in the 430RWHP range.
I run standard Autolites or the Autolite AR's in near everything. I started messing with the Iridium first with my wifes 99 Montero Sport which had them stock. I tried other plugs in there and they didn't run as good, last any were near as long (obviously, the Iriduim is very hard). I have a customers car here that I may try a set in on the dyno to see what is does, intercooler S-Trim set-up, 331, all the goodies.
The car we ran them on was a NA 308 that made in the 430RWHP range.
I run standard Autolites or the Autolite AR's in near everything. I started messing with the Iridium first with my wifes 99 Montero Sport which had them stock. I tried other plugs in there and they didn't run as good, last any were near as long (obviously, the Iriduim is very hard). I have a customers car here that I may try a set in on the dyno to see what is does, intercooler S-Trim set-up, 331, all the goodies.
DMAN302
My mom says thanks for the pearl necklace.
Just something I'm considering for next plug change..though I would not consider modifying the plug myself, I would much rateher pay the $$ to ensure it was done properly.
DMAN... occationally I come across tools being advertised specifically for cutting back the straps. I never paid much attention because it wasn't ever something I wanted to take the time to do but my impression of the thing was it supposed to make the job easy. If I see one again, I'll send you the info.
Indexing by the way, is when you clock the spark plugs to point the unshrouded portion of the plug gap towards the intake valve.
Indexing by the way, is when you clock the spark plugs to point the unshrouded portion of the plug gap towards the intake valve.
DMAN302
My mom says thanks for the pearl necklace.
Thanks bro..I would appreciate that. The idea of indexing is interesting, but likely not something I'd spend time doing. Once I've completed the 500 miles on the motor I will probably look at the idea of modified plugs...maybe even swap them out during some dyno time and see whats what.
dvs bullet
New Member
Mustang5L5 said:
A piece of info, my wife has a 99 cougar 2.5l. I put on the irridium plugs on her car just to see how they were but( I also putnew motorcraft wires on it ), after 8,000 km's on the car I noticed a miss, I pulled the plugs and found that the gaps were out some were out buy ten thou. So I think that it depends on the vehicle.
