NGK Iridium spark plugs
Cruiser
Joined: Jul 2015
Posts: 128
Likes: 3
From: Sevierville, TN
I've been running them for the last few months. Seems to start good and run good. I always ran the non iridium NGK's in all my Jap dirt bikes, road bikes, and still use them in all my lawn equipment with good results.
Here is a link for the poster that wanted to know the p/n http://www.dragspecialties.com/produ...umber=DCPR7EIX
Not really a big issue, just a personal preference. My bike is a carbie so I most likely wouldn't encounter any of the ecm problems that FI bikes might. Not too expensive of a bling anyway.
Here is a link for the poster that wanted to know the p/n http://www.dragspecialties.com/produ...umber=DCPR7EIX
Not really a big issue, just a personal preference. My bike is a carbie so I most likely wouldn't encounter any of the ecm problems that FI bikes might. Not too expensive of a bling anyway.
Last edited by smokyheritage; Nov 8, 2015 at 07:37 AM.
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
Absence of audible detonation doesn't necessarily mean that the system is working correctly with a different plug. It may never have seen conditions where detonation control was needed, or exhaust may be too loud to hear it, or it could also be pulling timing when it doesn't need to.
Last edited by Warp Factor; Nov 8, 2015 at 04:19 AM.
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
I use them in an 883 up to the 120R and all the versions of TC's in between. But for one reason only. I use E10 gas and the iridium is the best concentrated spark to ignite E10. If you have a built motor, run pure gas then copper core is the best choice. I run E10 87 octane thru the motors up to the 110's. They run strong and no pinging. The 120R and the 120ST are on 93 right now until I get three thousand miles on them then I will wean them down.
Note: Iridium NKG's are available with the correct resistance value to maintain the knock sensing system in the HD's.
There is only one reason that most cars makers use the more expensive iridium plugs. Gas mileage. It is because most cars are feed E10 and the iridium fires it better which yields better burns thus increase mpg's. Car makers are forced to use every strategy to achieve the ever increasing fleet average mpg goals. Some even resort cheating ie VW.
Note: Iridium NKG's are available with the correct resistance value to maintain the knock sensing system in the HD's.
There is only one reason that most cars makers use the more expensive iridium plugs. Gas mileage. It is because most cars are feed E10 and the iridium fires it better which yields better burns thus increase mpg's. Car makers are forced to use every strategy to achieve the ever increasing fleet average mpg goals. Some even resort cheating ie VW.
Last edited by lh4x4; Nov 8, 2015 at 05:35 PM.
Road Warrior
Joined: Jun 2013
Posts: 1,781
Likes: 50
From: Louisville, KY
I'll stick with the stock plugs (and wires and coils) on any vehicle with the ion-sensing anti-knock function, whichever original plugs the ion-sensing system was originally calibrated with at the factory (unless I have a darned good reason to do otherwise).
Absence of audible detonation doesn't necessarily mean that the system is working correctly with a different plug. It may never have seen conditions where detonation control was needed, or exhaust may be too loud to hear it, or it could also be pulling timing when it doesn't need to.
Absence of audible detonation doesn't necessarily mean that the system is working correctly with a different plug. It may never have seen conditions where detonation control was needed, or exhaust may be too loud to hear it, or it could also be pulling timing when it doesn't need to.
How do we confirm this?
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
Some must not be able to use a spark plug cross reference chart!
I believe that 6 ohms is the HD plug and any manufacturer has them. Most plugs today are resistor.
I use those in 19 HD's currently and five more that I have traded. No pinging even on the 110 with flowed heads and Stage I.
If you are too lazy to check the charts just buy them from J&P. They have already done the work for you.
Fear and ignorance makes some folks prisoners of their own minds.
I believe that 6 ohms is the HD plug and any manufacturer has them. Most plugs today are resistor.
I use those in 19 HD's currently and five more that I have traded. No pinging even on the 110 with flowed heads and Stage I.
If you are too lazy to check the charts just buy them from J&P. They have already done the work for you.
Fear and ignorance makes some folks prisoners of their own minds.
Last edited by lh4x4; Nov 8, 2015 at 10:20 PM.
Road Warrior
Joined: Jun 2013
Posts: 1,781
Likes: 50
From: Louisville, KY
Some must not be able to use a spark plug cross reference chart!
I believe that 6 ohms is the HD plug and any manufacturer has them. Most plugs today are resistor.
I use those in 19 HD's currently and five more that I have traded. No pinging even on the 110 with flowed heads and Stage I.
If you are too lazy to check the charts just buy them from J&P. They have already done the work for you.
Fear and ignorance makes some folks prisoners of their own minds.
I believe that 6 ohms is the HD plug and any manufacturer has them. Most plugs today are resistor.
I use those in 19 HD's currently and five more that I have traded. No pinging even on the 110 with flowed heads and Stage I.
If you are too lazy to check the charts just buy them from J&P. They have already done the work for you.
Fear and ignorance makes some folks prisoners of their own minds.
Ad hominems are uncalled for - play the ball.
Last edited by 1004ron; Nov 9, 2015 at 04:51 AM.
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
Some must not be able to use a spark plug cross reference chart!
I believe that 6 ohms is the HD plug and any manufacturer has them. Most plugs today are resistor.
I use those in 19 HD's currently and five more that I have traded. No pinging even on the 110 with flowed heads and Stage I.
If you are too lazy to check the charts just buy them from J&P. They have already done the work for you.
Fear and ignorance makes some folks prisoners of their own minds.
I believe that 6 ohms is the HD plug and any manufacturer has them. Most plugs today are resistor.
I use those in 19 HD's currently and five more that I have traded. No pinging even on the 110 with flowed heads and Stage I.
If you are too lazy to check the charts just buy them from J&P. They have already done the work for you.
Fear and ignorance makes some folks prisoners of their own minds.
Do you have data for this other type of resistance?
The main advantage of iridium plugs is that the tougher metal doesn't erode as fast, giving much longer service life and lower maintenance (up to 120 thousand miles in some cases). This is especially important on vehicles where space constraints make the plugs very difficult to replace. Harley plugs are a piece of cake to replace.
Last edited by Warp Factor; Nov 9, 2015 at 06:41 AM.
Extreme HDF Member
Joined: Dec 2007
Posts: 13,402
Likes: 941
From: Illinois
Not exactly different heat ranges have different part numbers. When a manufacturer makes a plug for a given vehicle they get the specs for that plug. So when it is listed for a 2010 TC103. The plugs will have the same specs. Plugs will have different heat ranges for individual applications. But any plug that says it is a replacement for a 6R12 it will match the 6R12 heat range and resistance.
The resistance level of the plug is essential to HD's ion sensing system. A non resister plug will corrupt the system as will a plug with to high resistance.
Want a cheaper plug than the HD branded one? Just get the Champion plug listed for an HD.
The main reason for iridium plugs is the concentrated spark from the tiny wire which ignites an E10 or higher content alcohol gasoline faster than copper core plugs. The secondary reasons are self cleaning and long life.
I ride 30,000 to 40,000(@37,400 this year) miles per year. Running E10 87 octane and achieving 50 mpg on the TC's from 88's to 110's saves me $700 to $800/yr. that is more than enough to buy a few sets of iridium plugs. I can not hear what anyone else is saying because I have researched the issue and have demonstrated for several years the merit of using the iridium plugs.
Warpfactor: The ion sensing system measures the TOTAL resistance. and responds by retarding the timing when it goes beyond the set standard.
The resistance level of the plug is essential to HD's ion sensing system. A non resister plug will corrupt the system as will a plug with to high resistance.
Want a cheaper plug than the HD branded one? Just get the Champion plug listed for an HD.
The main reason for iridium plugs is the concentrated spark from the tiny wire which ignites an E10 or higher content alcohol gasoline faster than copper core plugs. The secondary reasons are self cleaning and long life.
I ride 30,000 to 40,000(@37,400 this year) miles per year. Running E10 87 octane and achieving 50 mpg on the TC's from 88's to 110's saves me $700 to $800/yr. that is more than enough to buy a few sets of iridium plugs. I can not hear what anyone else is saying because I have researched the issue and have demonstrated for several years the merit of using the iridium plugs.
Warpfactor: The ion sensing system measures the TOTAL resistance. and responds by retarding the timing when it goes beyond the set standard.
Last edited by lh4x4; Nov 10, 2015 at 12:27 AM.
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Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
Not exactly different heat ranges have different part numbers. When a manufacturer makes a plug for a given vehicle they get the specs for that plug. So when it is listed for a 2010 TC103. The plugs will have the same specs. Plugs will have different heat ranges for individual applications. But any plug that says it is a replacement for a 6R12 it will match the 6R12 heat range and resistance.
I ride 30,000 to 40,000(@37,400 this year) miles per year. Running E10 87 octane and achieving 50 mpg on the TC's from 88's to 110's saves me $700 to $800/yr. that is more than enough to buy a few sets of iridium plugs. I can not hear what anyone else is saying because I have researched the issue and have demonstrated for several years the merit of using the iridium plugs.
Since you're not well briefed on the tech end of things, think of it this way:
If there was a challenge igniting and burning 87 octane E-10 properly, tailpipe emissions would increase. And this is not what outfits that do extensive testing, (vastly more testing than your 40K miles per year), like the EPA and engine manufacturers have found.
Personally, I don't run 87 octane in my Harleys, but premium. Why? It's what the manufacturer recommends, based on much more extensive testing than an individual owner can do, and it provides an extra margin of safety against engine-killing detonation. But if you're averaging 50 mpg, you aren't running very hard, so maybe 87 octane will be fine for you.
Last edited by Warp Factor; Nov 10, 2015 at 05:47 AM.
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