iridum plugs

Doc90 · Apr 21, 2006

do the denso iridium plugs make that big of a difference has anyone tried them just wanted to know

90 notch cobra intake, e-303cam,shorties,h-pipe no cats, u/d, electric fan, accel 8.8 wires, accel coil, 70mmt/b,

Rick 91GT · Apr 21, 2006

I put them in some of my daily drivers and noticed a little more seat power, and increased mileage. They do burn nice and have a great fire...

bryce93lx · Apr 21, 2006

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

Rick 91GT · Apr 21, 2006

The Iridium tip plugs work very well, in many production vehicles they are stock they do not cause half the issue the platnium plugs do with a power adder.

plainwrecknate · Apr 21, 2006

the iridium plug is too hot of a spark for a stock 302. i use nothing but the OE motorcraft plugs.

Daggar · Apr 21, 2006

plainwrecknate said:
the iridium plug is too hot of a spark for a stock 302. i use nothing but the OE motorcraft plugs.

Does that indicate that you've not tried them? I tossed a set into my KB combo and was able to open the plug gap from .030 to .045. More spark surface, better combustion, same ignition system.

Yes... they help.

Mustang5L5 · Apr 21, 2006

Daggar said:
Does that indicate that you've not tried them? I tossed a set into my KB combo and was able to open the plug gap from .030 to .045. More spark surface, better combustion, same ignition system.

Yes... they help.

Good results in supercharged applications, but not so in N/A

DouglasOhio · Apr 21, 2006

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

Mustang5L5 · Apr 21, 2006

DouglasOhio said:
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

+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.

Daggar · Apr 21, 2006

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 · Apr 21, 2006

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 · Apr 22, 2006

Think they would work for our nitrous motor?

We usually use the NGK "8's"

Rick 91GT · Apr 22, 2006

I'd stick with the NGK's.....have you ever tried the plugs from NX?

DMAN302 · Apr 22, 2006

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.

Rick 91GT · Apr 22, 2006

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.

DMAN302 · Apr 22, 2006

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.

Daggar · Apr 22, 2006

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.

DMAN302 · Apr 22, 2006

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 · Apr 22, 2006

Mustang5L5 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.

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.

Daggar · Apr 22, 2006

New plugs should ALWAYS be regapped. You never know what's happened to them during manufacturing, packaging, and shipping.

iridum plugs

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