NGK CR8EHIX-9 Iriduim Spark Pug (add power?)

[seyaat420]

Ok now that I know you can easily change the spark plug thanks to a great how to vidio. I would have never guessed that the little plastic cover gets removed to reviel the spark plug, I though you had to take a bunch of crap of, as I dont have a manual yet. Ohh yea one more thing I just learned you dont have to take the plasic off as well for adjusting the idill, darn I wish I would have know that last week then it would have been alot quicker. So My question is this is the NGK Iriduim worth the extra money, cause I was concidering it. here is a link to show you, but im going to try to see if they have them here at the auto store.

here is the link to the site

store.scootertronics.com/horuirsppldp.html

[chanito]

Rare metals, burn at a much higher temp than steel or regular metals do, regular spark plugs have metal from the tip of the center electrode and ground electrode melt on every spark and get spend on the combustion, so over time they wear out, having the gap (distance between center electrode and ground electrode) grow bigger, making the spark having a harder time jumping it, plus the electrode start to have the edges round off, sparks are easy to start on a sharp edge, so this rounding off, compounding the problem
Platinum and iridium can withstand the combustion temperatures with a smile so they can last way longer than regular plug, plus the performance stay almost the same for the life of the plug, also the center electrode can be made very thin, almost needle like without fear of premature wear, and this make the spark jump easily and exposes more mixture to the flame, which helps on wedge style combustion chamber like an American V8 but not so much on a hemihead like the one in the Ruckus.
So the short answer is the iridium plug will not give any more power but will last way longer, however is so easy to change plug on the scooter i think is not worth the money as you can probably just keep changing the stock plug every 2 years or so and save the money

[seyaat420]

Ok thats sound good, the only reason I asked is because, On my car I had installed bosh platinum 4's in my car versas, the one tooth spark plug this one has 4 teeth. And I did notice a big diffrence in performance. But I have also heared that the bosh platnum plugs make a bigger combustion, and can possible hert your car over the long period of time, Is this true? Why do those plugs work better? Or is it just me cause I have installed the bosh platinum 4 on a VW cabrolet , Nissan sentra, and a Saturn sc1. And every car had a performance gain. So I understand how the Iduim plugs work, Do you know how the bosh platnum 4 works? Anyways hit me up,,,,,,,,,chris

[Dandy Dan]

The most likely reason for the performance increase in your car is that your old plugs were old and not working at 100%. Fancy pants plugs shouldn't give you a noticable increase in power, only in the life of the plugs. Another good possible explanation is a placebo effect was occuring. Unless you're having those cars dyno tested then you really can't say there was a performance increase because there's really no way the increase in performance would be enough to notice with your 'butt dyno'. The Bosch Platinum 4's that you tossed in your car do have one minor advantage which is that they take up more space inside the combustion chamber so they effectively increase your compression ratio (slightly!).

Anyways, that rumour about the Bosh plugs overheating your car because of a bigger combustion seems highly improbable. The size of the bang in your cylinder is determined by the amount of oxygen and gas in your cylinder and the ratio that they are combined so I don't see how a different plug would affect this. Essentially, a bad plug can cause you to lose power if it's having a hard time firing but a good plug doesn't add power...it just lasts longer. As the old saying goes, 'it only takes a match to burn down a house'.

[seyaat420]

ok I agree with that, and you can probly get like 3 plugs for the price of one of those expensive one's. I think I will go with just adding good plugs more often then later. I know you should change your plug like every 2 years but does anyone know how many miles?

[chanito]

8-)Factory recommends change at 5k miles intervals, the problem is for most people that takes a long time, and short rides like most of us do take the most toll, so i would recommend to do it at 2.5k miles or 4k kilometers.
OK some theory, the idea behind multiple ground electrodes, is to give multiple options for the spark to jump, the spark will jump easier from a cool metal, and will last longer the less voltage needed to make it jump, so the spark will jump from the coolest electrode, with the less voltage requirement, but as soon as it jumps it will heat up the electrode, making the next spark harder to jump, but since it has more electrodes, it will jump from another, and keep the spark jumping happy, but in real life the spark will jump from the electrode closest to the center electrode, and will only occasionally jump from another, also those extra electrode use up a lot of volume, in some cases increasing compression enough to make the engine run hotter, but on some other engine the extra compression might give you some extra punch
Back in the 80's we were running stock 4 cylinder Nissan engines on some classes on SCCA, that require very stock engines, so we were looking for ways to get as much extra power as we could within the rules, we try different spark plugs and gasolines on the Dyno (back then the platinum were not allow under the rules) and we find the more power from some fancy plugs from Nippon Denso with a ground electrode with an inverted "U" shape and NGK with a"V" groove on its center electrode and regular gasoline from SHELL, fanny thing is those plug were replaced by the platinum ones and SHELL has reformulated its gas so that information is useless The gain was about 2-3 HP on a 115 HP engine, but on stock classes you take what you can get