Thread: spark plug opinions

Personally I would not suggest running that cold of the Tstat. I'd bring that up to a 180F
Which ZZP wires, the bad ones or the bad ones? Supposedly only the originals and latest batch are good.
MSD coils, known to have spark issues at high rpm in as short as 3-6 months.
TR55's, iridium or copper, you can get both.

I'm thinking you are having some issues and that's why you are asking. The coils and wires are suspect. Running too cold is also an issue, as is running nearly a stock gap on a 3.4" pulley.

Gap should be smaller
Thermo should be 180F
Coils should be stock
Wires should be good (ZZP or whatever, but a good set)

Most people recommend a gap of .050-.055.

I have never had those coil packs so I can't speak from experience, but everything I have read says stay away from them...

That cool of a thermostat, in my opinion, is bad. If you are opening the thermostat to soon/to often, the coolant is not sitting in your engine long enough to absorb the majority of the heat. The sensor reads coolant temp, not engine temp. Coolant could be 160* but your motor could be a lot hotter. If this makes sense? Something to think about...

I'm running standard copper Autolite's in my car, have for 4-5 years now on stock wires. I have to change them more often, but not had issues. Gapped at .050ish... I'll upgrade wires eventually, just like the lifetime warranty on the stock replacements..

Ok.. since you say there's an issue and the programming to overcome. I'd suggest taking this one step at a time.

Change only the MSD's. See if the issue still exists.
Change your gap, so there's no worry about blow out. See how that goes.
Then wires

Originally Posted by BillBoost37

an issue is running nearly a stock gap on a 3.4" pulley.
Gap should be smaller

I have yet to get an answer from anyone as to how this helps anything at all. I've yet to see anyone have an issue (and how would that issue manifest?) with stock gap on a 3.4" setup. But I see daily recommendations for smaller gap from people who have never experimented with gap. Any chance you can lay down some knowledge?

Originally Posted by SlowNA06

I have yet to get an answer from anyone as to how this helps anything at all. I've yet to see anyone have an issue (and how would that issue manifest?) with stock gap on a 3.4" setup. But I see daily recommendations for smaller gap from people who have never experimented with gap. Any chance you can lay down some knowledge?

More boost from a smaller pulley will be more likely to blow out the spark and create a misfire. Tightening the gap will prevent this. I run AL104's at .050 and change them every other oil change.

Originally Posted by Anthony Smith

More boost from a smaller pulley will be more likely to blow out the spark and create a misfire.

How much boost required to cause a misfire when gapped at 0.060?

Originally Posted by Reverant GTP

generally doesn't everyone say 3.4 is too small with headers on 04+?

I've seen a 3.4 run without knock with plog+3"dp on 04+. I'm sure it was tuned pig-rich, but it ran. The tune can make up for some naughty modding. That kind of stuff is probably the vast majority of canned tune business.