Spark plug brand

[SkavenDC]

Originally Posted by 07midnight57

Make sure you gap them properly. Stock gap does not work well with the Dyna's.

Oh ya. I have all that info written down as to the proper gap for use with the Dyna's.


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[SkavenDC]

I have read the same. The tip is very fragile. I know you avoid the old "coin" style gappers and do not pry against the iridium. I understand it can be done with care and the proper tool.

Originally Posted by sanny651

Check the gap stuff...I was told by a few people that you do not gap iridium plugs at risk of damaging the fragile tip of it. Not saying it's gospel, but that advice came from people more "in the know" than me.

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[arizonawarrior]

Being RSWarrior-specific, iridium plugs have some other great advantages. The difference in resistance is very very small in spark plug applications and there isn't much spark lost to heat. Plus there's less room for carbon deposits on the small tips which is why they are shown to be better at self-cleaning and why fouling is less common with iridium. I don't miss copper spark plugs at all, the tips get hot and the round-out effectively opening the spark gap wider rtequiring regapping and there's other down-sides to the older technologies. All spark plugs are built better than every before, so its hard to go wrong wit anything these days. I've read all the same stuff, including platinum, and all I can say is I'm very happy with the iridiums and I have zero maintenance issues even with the hotter dyna coils.

Originally Posted by sanny651

LD, from what I've read (even on Nology's site) Iridium doesn't produce as efficient of a spark and that it's designed for longevity, not performance. Iridium is not as good of a conductor as other metals such as copper or silver. Silver and Copper plugs don't last as long as iridium ones, but they have a more efficient and better spark.

I mentioned earlier about my ATV Air/Fuel mixture ratio that was gauged by a Koso brand meter. Simply by changing from an NGK standard plug to an NGK iridium plug, it burned richer, which indicates a more incomplete/inefficient burn. That wasn't a butt dyno or me trying to look for information to back my stance. This was a purely unbiased effort to find out if there was any factual evidence that would indicate a change in performance based on a plug change, and the answer was determined to be that performance decreased. BUT, is it that much of a difference? That will be a point of debate that cannot be won by anyone because performance is defined differently by many people. 1/10 of a second isn't even a thought to some people, and to others it's the difference between moving on or going home at the races. So the next question is whether the loss of performance is worth the gains you get in not having to change out the plug as frequently. There too, I think it's a personal opinion/decision to which there is no right/wrong answer. Some would take a cat's whisker less performance if it means they wouldn't have to change plugs every year or two. Others would take higher performance even if it meant a complete motor rebuild every year. Just depends on the rider I think.

I guess I would liken it to tires. You can get tires that have a 60,000 warranty and they are built for endurance, not performance. They last a long time, but don't corner nearly as well as the performance tires. The tires you buy for a Ferrari don't have a warranty as they aren't built/designed to last long, but they stick to the road like glue and provide superior performance.

[sanny651]

Plus there's less room for carbon deposits on the small tips which is why they are shown to be better at self-cleaning and why fouling is less common with iridium.

Never thought of that AZ. Excellent point.

I'm new to this EFI stuff. Being that the Warrior is not a closed loop EFI system, is it a safe assumption that because the resistance difference is so small and the combustion efficiency difference is not very much, will the EFI adjust accordingly for that difference? Stupid question for most I'm sure, but I'm a carb guy and if there are adjustments needed, you manually need to make the change (as you all know).

Good conversation with excellent points gang. Keep 'em coming! Great stuff to chew on.

[arizonawarrior]

The EFI doesn't have a way to adjust for that but it doesn't really have an effect.

[warriordude]

Sure copper and sliver are better conductors than iridium. It don't mean doosquat at the voltage we are talking about. 35,000 - 50,000 volts it is all about sharp and pointy.Dyna coils need more plug gap B/C they make higer voltage. It is like your garder hose turned on full the water might leave the end 5 inches but put your finger over the end and it will shoot 20 ft. across the yard.U can gap Iridium's,just be careful. put .003 to .005 more gap in them and reinstall and let see what the A/F meter tells us.

[sanny651]

MORE gap on the iridiums? If you had more resistence with iridium, wouldn't you want to close the gap?

[07midnight57]

I run a tighter gap on iridiums than factory because of the dyna coils. Everyone on this site that runs dyna coils runs a tighter gap, I know that because that's where I got my info from.

You can gap any spark plug, just use the right tool.

[freerider8]

I am wondering when is it recommended to change the spark plugs? How many miles can be typically had on a set?

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[sanny651]

Manual says every 8,000 miles for plug changes from what I heard. I haven't looked it up, but someone said that.

I guess I don't understand the gapping stuff. I would think that gapping them closer would require less power, and when you have a coil that puts out more power than stock you'd want to gap them larger. I'm not saying that's right...I'm saying that's what I would think in my head. Can someone explain the reason why I am wrong?