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Post by Deleted on Jun 4, 2013 19:45:25 GMT -5
I also notice better performance installing a performance coil all by itself since the irridium plug was installed a few months ago.
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Post by lykos23 on Jun 4, 2013 19:48:11 GMT -5
Oh, man! I can't wait to get mine in the mail!
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Post by indymoped on Jun 4, 2013 20:37:58 GMT -5
Its actually a Pulse Star Plug on the Right VS an NGK Iridium Plug on the left. Iridium plugs have a weaker spark and are actually not as good performance-wise as a copper plug. Iridium plugs are only popular because they are longer lasting than a copper plug.
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Post by prodigit on Jun 4, 2013 20:42:56 GMT -5
Doesn't make much of difference in real life.
If anything, from the vid I'd say the NKG is better than the iridium.
A bigger spark will ignite fuel better I'd say.
Iridium just lasts longer, but in most cases, changing a spark plug on a scooter is a 5-10 minute job, and costs like $5 to do. In fact, you can adjust the arm to a tighter gap (don't even need a spark plug gapper), and all it costs you is the time to take out the plug, regap, and put it in again. I think the stock chinese plugs are good enough; at least for the first 3000 miles, with readjustments they probably last for +10k miles.
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Post by lykos23 on Jun 4, 2013 20:43:02 GMT -5
Now I'm just confused...
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Post by Deleted on Jun 4, 2013 20:56:23 GMT -5
What should the gap be on a regular NGK plug should one decide to not use the irridiums?
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Post by indymoped on Jun 4, 2013 21:00:25 GMT -5
I have seen specs anywhere from .027" to .035"
I run mine at .028" gap
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Post by bvance554 on Jun 5, 2013 0:48:49 GMT -5
There are no spark plugs that increase engine performance, if thats what you're after.
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Post by indymoped on Jun 5, 2013 8:16:13 GMT -5
We need a like button for peoples comments. I like this^^^^
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Post by bwader on Jun 5, 2013 10:00:34 GMT -5
I contacted Pulstar last fall requesting a spark plug that matches a NGK Irridium for 150cc china scooter. They said they don't currently make them.
But I got them for my 2005 Nissan sentra, they were $12 each and it wasn't worth it.
I got better gas mileage, went from hitting 39mpg-40mpg (hypermiling ) to 42mpg max (normal driving 32-35mpg to 36mpg Pulstar) when I reset the mileage counter. When I measured economy mpg starting with a full tank, noting the miles and filling up 3/4 of a tank later I had really maybe 2-4mpg better.
Then one day I had a check engine light went off, it was a cylinder misfire or something like that,(my engine started up rough) and I took the 20 min and put my NGK irridiums back in my car ( wire wheeled and checked gap) .
I haven't had any problems.
Watching the video is amazing but in actual life its not much better. It started up easier though. My car I have to turn the key let it turn once sometimes then turn the key again to start. With pulstars it started up the first time
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Post by lykos23 on Jun 5, 2013 11:14:41 GMT -5
There are no spark plugs that increase engine performance, if thats what you're after.
per·for·mance
noun \pə(r)-ˈfȯr-mən(t)s\4: a : the ability to perform : efficiencyb : the manner in which a mechanism performs. ef·fi·cien·cynoun \i-ˈfi-shən-sē\ 1 : the quality or degree of being efficient 2 a : efficient operation b (1) : effective operation as measured by a comparison of production with cost (as in energy, time, and money) (2) : Sparkplug gap alone can raise or lower your engine's MPG. I don't see how that doesn't correlate to engine efficiency/performance. With this example shows that iridium plugs cause some change in mpg. Here we see that the physical properties of iridium are indeed different from the standard applications of copper and other metals in a spark plug. This is the spark pattern: www.globaldenso.com/en/products/aftermarket/plug/power/images/p1-6.jpgAnd finally, here's some propaganda from an iridium sparkplug manufacturer that shows the difference in fuel consumption: www.globaldenso.com/en/products/aftermarket/plug/qa/iridium/images/p14-2.gifConclusion: Spark plug gap plays a significant role in the spark pattern. Spark plug spark pattern has an effect on MPG, even if it is minute. The characteristics of spark plugs range; copper, platinum, iridium, silver, etc. The characteristic of a sparkplug's spark thus changes. Thus, the economical efficiency of a vehicle is not wholly dependant on, but is indeed effected by your spark plug and spark plug gap. Therefore; sparkplugs effect performance. |
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Post by prodigit on Jun 5, 2013 12:42:27 GMT -5
The gap for a spark plug should be at least 0.010". I've noted if it's smaller, that my scoot will start to stall. 0.012" or bigger recommended. Stock they come at 0.024" or 0.025".
Quite often you can widen the gap to 0.035" after which the scoot will start to stall also.
So the tolerance is quite wide. Once you see a stock plug, you can almost half the gap size, and be sure it'll ride you a good 10k miles before you need to regap.
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Post by Moat on Jun 6, 2013 14:20:12 GMT -5
It is easier to initiate a spark from a smaller tip surface - therefore the smaller electrode of an Iridium plug will provide an advantage of more consistent ignition (resistance to misfire) under worst-case conditions... all else being equal.
Also note that, as long as the ignition circuit can supply it - and all else being equal - a larger plug gap is always better than smaller. It's as simple as a matter of the spark having a greater chance of exposure to something ignitable - thus preventing mis-fire. Cold starts, lean mixtures... a wider gap is very benificial. This is why auto manufacturers developed High Energy Ignition systems (pushing the spark across wide plug gaps) in the 70's - to help cure the poor running/misfire that resulted from lean, emission-tweaked mixtures.
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Post by prodigit on Jun 6, 2013 16:37:20 GMT -5
I wouldn't say that's true.
It's easier to initiate a spark when the arm and tip are closer together, but with a wide center pin, the spark can form anywhere on the surface of the center pin. With a tiny center pin, there's a lot more heat that the pin has to endure (which is why they chose irridium), and the spark is more focused.
Besides, if you look at it in slow-mo, there's not one, but several sparks that appear every time the plug ignites. It goes so fast, we barely can see it, but it are several sparks, that cause ignition.
When you lengthen the gap, the bike needs more power to overcome to create a spark, and there will be fewer energy releases (or sparks) seen in slow mo.
When you shorten the space between arm and center pin, the spark will be smaller, but more sparks will be fired in that millisecond.
It's actually healthier for the bike to have a small spark plug gap, than a big one.
But like with anything, there's a middle road you'll have to figure out what works best for your bike.
On my taotao ATM50, no question, a 0.012" gap is optimal!
I set that same gap for my 150cc, and it works fine.
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Post by spandi on Jun 6, 2013 19:48:16 GMT -5
Shouldn't the heading for this be: "NKG vs Plasma"?
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