EFIDynoTuning Forum

So i was reading some of the write-ups on the homepage and came across the plug gaps. I'm running TW heads with the Autolite 3924 gapped at .045". The write-up said to gap at .050". My question is im planning on switching to a iridium plug, do you recommend the same gap?

I don't recommend iridium plugs.

decipha wrote: ↑2021 Jun 28, 13:56 I don't recommend iridium plugs.

Is this because copper has better electrical and thermal conductivity than platinum and iridium, or is there more reasons beyond this?

Apex wrote: ↑2021 Aug 04, 13:35

decipha wrote: ↑2021 Jun 28, 13:56 I don't recommend iridium plugs.

Is this because copper has better electrical and thermal conductivity than platinum and iridium, or is there more reasons beyond this?

I'm curious about this as well. A good friend of mine whos been in engine building and drag racing game a long time recommended the platinum or iridium plugs over copper core. he swears by them. even has dyno tests that shown a 7-10 hp difference at the wheels. But im always open to learn more and hear different points of views on subjects like this.

Tight gap iridium can work, but this all goes back to coppers being "gap-able" over the P/PP/Ir plugs I'm sure. With a good ignition you should be ok if that is what you wanna run.

My 03 cobra blew out spark on the iridium's, didn't on 764's or TR-6's gapped in.

Personally I stick with 764, 103 or TR-6 on pushrods, 2v and older 4v setups.