Definitely not going to go 2 steps colder. No need for that.

 

do you have a stock motor if not what is the compression ratio of your engine

 

Stock block

 

i would run 1 step colder plugs (ngk iridium ) and gap them down to .025 and maybe spend a little tune time just to make sure it dosent detionate in the high revs

 

bringing back an old thread if i can.... anyone know WHICH copper plugs to use?

 

The only issue I had with iridium is they break easily when re-gaping.

 

i have iridium

 

Im going to be getting new plugs myself this coming week or so...

 

IIRC, the platinum puck on the platinum plugs can come off from the increased pressure and cause damage.

 

To gap bigger, they are fragile and you can NOT gap them larger in my experiences.

Closing the gap just takes some pressure on the arm to close the gap up. This does not require pressure on the iridium part.

 

And why is that???
The 1 step and 2 step are the same how ever you can have more advanced timing on the 2 step. any other wise reason why u wouldn't go for something that is colder and might protect your engine more???????

 

As for the Plat. they r fine iridium r better its as simple as this :-)

 

???

 

+1 i want to know why please ? BTW we live in the Oven Side of the World don`t ever compare our temperature in the summer to any other part of the world

 

What are you guys closing the gap to??

 

+1 I have been using the same iridium plugs for the past 2 years without any problems and they where never gapped. I was told they are too sensitive and where already pre gapped to the correct specs. Also when should the plugs be replaced?

 

Id replace my plugs about every 30k miles.. But if im correct my iridiums came with a .045 gap or something close to that..

 

I had to close the gap when I ran Nitrous and I broke a couple of the arms. I thought the arms were Iridium or at least a weaker material becuase the plat and copper plugs never broke on me.

 

NGK LFR6A-11

 

What gap is good on the coppers? are those 1 step colder? is .025 safe?