Update on my copper 3923's. Very noticeable gas mileage increase as well as MORE low end torque. I'm very very pleased. And she even sounds better on start-up...more beastly.

 

Sorry, even though I like you, I need to call B*ll**** on this statement. Noticeable gas mileage increase? Maybe you drove to different places, differently? More low end tq? Let's be serious. More beastly at start-up?? I think your just excited about changing your plugs. lol.

I am one of the few people on here running autolite double platinums and they run perfectly fine in my 06. Copper plugs are in these trucks to save money, and make more money with more frequent service intervals.

 

You seem to have something against copper plugs. Platinums are for extending your change interval. Copper actually has lower electrical resistivity and some high performance ignition systems require copper plugs (I had a MSD SCI+ ignition in my 1994 Ingetra GSR, platinum or iridium plugs were a huge no no for that system).

Electrical resistivity of copper: 0.0000000168 ohm.m
Electrical resistivity of platinum: 0.000000106 ohm.m

Now I doubt either one makes a big difference in performance on a stock truck but I will say mine idles noticeably smoother with the 3923's.

 

Call bull**** all you want. You aren't here, you wouldn't know.

 

I understand that. I have nothing againts copper plugs, that would be funny if I did though. lol. In a N/A motor like the 3.7/4.7 we have, these things should have come out of the factory with a long life plug. Plats were junk for our SRT-4 also, plus they needed to be changed so often, it wasnt worth investing anyway.

There is just tons of hype that these 3923s change this engine so drastically, and on the other side the platinum plugs decrease gas mileage, cause issues, truck wont idle right.

http://www.se-r.net/engine/platinum_copper_ngk.html

Is the linked (above link) concept false, because this is what I was taught with using a plat or iridium plug.

I just don't see why anyone would want to, or need to keep changing out coppers in the 3.7/4.7.

 

No, the concept is sound, I dunno for some reason I read your earlier post and got the impression you were on a mission against copper plugs . But if you think about it, platinums gapped the same as the coppers would probably make it run like crap.

 

I finally bought a set of the 3923's but they were not listed for either the ho or non ho. 3922 was listed for my truck, but I got the others anyway. What do I gap them at? The guy said he wasn't sure since it wasn't listed for truck.

 

I gapped mine at stock gap and it's been running great.

 

Gapped mine at .40

 

Is .40 stock gap?