Has anyone here ever crossed the crossfire spark plugs over to a standard copper NGK plug or anything? I need to drop my plugs a couple of heat ranges and was wondering if anyone has the info before I do all the work myself. Thanks.

Joe

 

Hmm, ok I'll let you guys know what they are if you are interested. Apparently I'm the only one who has needed to change them.

Joe

 

what are you doing dropping the heat range for? its a question.
i got 2 changed at the dealer in cylinder 6 cause it was missing at 20,000 mile and that's all the dealer said he could do as the computer said so! apparently it was the first time they had one gone faulty.
however, i had been using acetone (did not tell them though) gave me 2 miles gallon extra. don't use it now though, did not want the valves burnt.

 

Nitrous. It is a good rule of thumb to drop 1-2 heat ranges. Also, I have not looked into it for sure, but I'd be willing to bet they are platinum- platinum and nitrous/forced induction don't mix! They tend to burn very hot at the tip and glow leading to detonation problems- not good on the spray or under boost.

Joe

 

I totally agree that when running boost or N2O, it is a good idea to run with at least one heat range colder to prevent pre-ignition from being a problem. Here are some NGK options for those interested:

- BKR5E-11 (standard Ni-alloy spark plug, 0.80mm center electrode, heat range equivalent to stock)
- BKR5EGP (single platinum spark plug, heat range equivalent to stock)
- BKR5EIX-11 (single iridium spark plug with 0.60mm center electrode, heat range equivalent to stock)
- PFR5R-11 (Double platinum type, 0.80mm center electrode)

The options above are replacements for stock plugs. Essentially, finer the electrodes = less voltage required to create a spark. This is important, as lean, dense mixtures have a way of increasing the voltage required to make a spark. If the voltage requirement becomes too great, misfires are more likely.

Fine electrodes also improve "ignitability". This means the flame kernal is better able to propagate, and thus combustion is improved. Ignitability improvements translate into improved idle quality and a feeling of improved responsiveness (though any improvement in hp is debatable).

Now, for anyone looking to run boost, try one heat range colder: BKR6E, BKR6EGP, BKR6EIX, etc. You will note these don't have an "11" on the end. The "11" of the #5 heat rating plugs translates to a 1.10mm gap size. The heat range 6 plugs noted all have 0.90mm gap sizes. I suggest using a smaller gap size in a car running with NOS or boost because again, it is a denser, leaner condition and thus limiting the amount of voltage to make a spark is probably even more important than it is in a stock engine.

Hope this helps.