Denso Iridium = HP? - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 16 (permalink) Old 08-01-2006, 12:32 AM Thread Starter
 
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Denso Iridium = HP?

I was reading a research article written by NipponDenso which showed that its .4mm Iridium sparkplug equipped bike out accelerated the same 2.5mm Nickel plug bike. I used the time/distance provided and the horsepower formula (33,000lb/ft/min) and they showed about a 1% (.7694%)gain in HP. Wow... This means a 120hp bike could gain a solid 1hp with no tuning or loss of low-end power for $48.00 and about 35 minutes of work. That's cheap horsepower. I was checking around on their site and found these sweet racing plugs for $35.00 each with an Iridium Center and solid .8mm platinum ground. Talk about anti-quenching. Someone should test this on a dyno.

Last edited by animosity242; 08-01-2006 at 01:52 PM.
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post #2 of 16 (permalink) Old 08-01-2006, 02:27 AM
 
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all i got from that was $48 for 1hp!
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post #3 of 16 (permalink) Old 08-01-2006, 03:48 AM
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I switched from a NGK dbl plat to a NGK iridium plug on my 9R a few years back. I swear I could feel the difference. The throttle seem to respond better.

I was told by a tuning shop that the iridium plugs actually fire more acurately and that's actually where you get the more power from.




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post #4 of 16 (permalink) Old 08-01-2006, 11:52 AM Thread Starter
 
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You need a new tuning shop then. Iridium do not fire more accurately, in fact that makes little sense. Platinum are better because the have a high melting point for longer life, it resists oxidation better (platinum's equivalent to rust), and it's a harder metal than than Nickel (standard plug) so they can get away with smaller center electrodes. Smaller electrodes, both center and ground, prevent what is called "quenching". When the flame kernel begins to develop between the electrodes, after the spark, it's growth is slowed because it has to go around the electrodes in order to expand. Larger electrodes = More Quenching = Less efficient combustion = less power. Iridium alloy is better in all 3 areas. The alloy is so much harder in fact that they can make a .4mm center which 1/2 the size of platinum and 1/6 the size of nickel electrodes. Denso, by the way, is the only company that figured out how to manufacture a center electrode so small, everyone else is doing .7mm. Thats a center electrode smaller that a mechanical pencil's tip. I should have called this thread "Sparkplugs 101" Simply put, this is how it is: Harder Metal = Smaller Electrode = Less quenching = more efficient combustion = more horsepower. And, Iridium is quite hard.

Last edited by animosity242; 08-01-2006 at 01:51 PM.
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post #5 of 16 (permalink) Old 08-01-2006, 12:25 PM
 
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Wow that's a lot of info! I don't know what it all means but if I read if over a few times maybe I'll get it. Thx. rep pts added (at least for effort)
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post #6 of 16 (permalink) Old 08-01-2006, 02:23 PM
 
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My bike came with Iridium plugs...that's the only kind of plug spec'd...they cost me 78 bucks last time I changed them...
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post #7 of 16 (permalink) Old 08-01-2006, 03:16 PM Thread Starter
 
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Not bad, but a good percentage of the time you can get better plugs than the factory materials, like the $35.00 a piece ones. My reference is for guys with bikes over 10 years old, like me, when platinum wasn't even popular. I your case I would research the different brands for newest technology(like electrode width) next time you change them. Right now Denso leads the pack. (read above)
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post #8 of 16 (permalink) Old 08-01-2006, 03:28 PM
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Interesting




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post #9 of 16 (permalink) Old 08-01-2006, 05:18 PM
 
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I thought I posted in this last night. Did someone delete it??
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post #10 of 16 (permalink) Old 08-01-2006, 11:40 PM
 
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Well I read that the thinner the center electrode, the easier they foul.

Speaking of spark plugs and fouling, does anyone remember the spark intensifiers that mounted between the plug cap and spark plug. It was supposed to increase the spark. It came as a kit and included new plugs and intensifiers. Motorcycle Consumer News tested them in the 1990's.

They installed them on a bike and it ran the 1/4 mile slightly faster than the normal plugs. But the spark plugs used in the kit were non-resistor plugs. MCN then took off the intensifiers and ran the bike with the non-resistor plugs. It ran the same as with the intensifiers, but faster than the resistor plugs.

Honda recommends NGK DPR9EA-9 plugs for my CBR. I use NGK DP9EA-9 non-resistor plugs. Around $2 each. I also took out the resistor in the plug cap, and substituted a metal rod. This gives a hotter, but shorter-lasting spark. It always starts on the first jab of the starter, and seems to be less prone to fouling.
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post #11 of 16 (permalink) Old 08-02-2006, 11:35 AM
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Quote:
Originally Posted by DLITALIEN
I thought I posted in this last night. Did someone delete it??
Nope... nobody did anything.




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post #12 of 16 (permalink) Old 08-02-2006, 09:11 PM
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Quote:
Originally Posted by No Worries
Honda recommends NGK DPR9EA-9 plugs for my CBR. I use NGK DP9EA-9 non-resistor plugs. Around $2 each. I also took out the resistor in the plug cap, and substituted a metal rod. This gives a hotter, but shorter-lasting spark. It always starts on the first jab of the starter, and seems to be less prone to fouling.
Interesting!

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post #13 of 16 (permalink) Old 08-02-2006, 09:17 PM
 
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Quote:
Originally Posted by animosity242
I was reading a research article written by NipponDenso which showed that its .4mm Iridium sparkplug equipped bike out accelerated the same 2.5mm Nickel plug bike. I used the time/distance provided and the horsepower formula (33,000lb/ft/min) and they showed about a 1% (.7694%)gain in HP. Wow... This means a 120hp bike could gain a solid 1hp with no tuning or loss of low-end power for $48.00 and about 35 minutes of work. That's cheap horsepower. I was checking around on their site and found these sweet racing plugs for $35.00 each with an Iridium Center and solid .8mm platinum ground. Talk about anti-quenching. Someone should test this on a dyno.
since your good at this formual stuff maybe you can explain to me how to get my VCR from blinking 12:00
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post #14 of 16 (permalink) Old 08-03-2006, 10:28 PM Thread Starter
 
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Hey tater, (wait maybe I'll use redneck lingo) hey hit du dern thing wit yur nose as hard as you can. Ah, hell he probably cant read anyway. If you can, say this out loud in the mirror: WE-TODD-DID
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post #15 of 16 (permalink) Old 08-04-2006, 10:55 AM Thread Starter
 
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You're referring to fouling from the electrodes being worn away, and yes smaller center and ground electrodes will wear faster unless you use a better material. Platinum were designed mainly to be a maintainence free plug (your 100,000 mile plugs) They probably couldve gotten 150,000 miles from iridium if they wanted, but instead they chose a performance increase by reducing the center electrode width and still can claim 100,000 miles replacement intervals.
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post #16 of 16 (permalink) Old 08-04-2006, 11:14 AM
 
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Quote:
Originally Posted by animosity242
Hey tater, (wait maybe I'll use redneck lingo) hey hit du dern thing wit yur nose as hard as you can. Ah, hell he probably cant read anyway. If you can, say this out loud in the mirror: WE-TODD-DID
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