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  #25  
Old 10-06-2011, 09:49 PM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

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Originally Posted by Walt View Post
.... I checked the resistance of 2 sets of used MOPAR OEM plugs today. Varied between 1.389 and 1.480 ohms. Readings taken from top connection to center electrode. Somebody else can check some other brands for you, if lying around. [Will not be in Physics lab until Thursday.]
The Physics lab has LCR meters that check inductance (L), capacitance (C), and resistance (R). Unfortunately, I forgot to take the plugs. Next trip now on Tuesday. Will report values then.
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  #26  
Old 10-07-2011, 04:06 AM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

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Originally Posted by brunality View Post
... when I went to order them from RockAuto it's now recommending a double-platinum or iridium for the waste spark. So has anyone done this or heard of it? It sort of makes sense to see that, but how would the coils hold up to different plugs? 8 copper 570's for main spark and 8 others for the secondary fire?
I'd love some input even though I'm probably going to stick with 16 570's.
I've actually installed 8 Iridium plugs to main spark and 8 copper to waste spark on my '05 HEMI. I'm also thinking of getting rid of the waste spark and the wires crossing over the block and having both plugs as main per cylinder.

I'm happy with the Iridium ones too.
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  #27  
Old 10-10-2011, 09:37 AM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

You mean just disconnecting the waste spark plug wires? Or rerouting the wires to have 2 plugs fire simultaneously per cylinder? Would that even work?
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  #28  
Old 10-10-2011, 02:36 PM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

Yep, shorten each coil pack wire to the plug on the same cylinder. That's how they have it from '07 model onwards (if I remember it correctly).

They say waste spark was a bit useless as the main spark did a pretty good job. So, I'd say it should perform better having twin spark as main, shouldn't "miss a beat" and looks much more tidier.
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  #29  
Old 10-10-2011, 06:00 PM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

Its not a new idea.Yes it looks a lot better and is way neater, depending on what you read it may/may not lose 3 hp. You'd never notice it........unless you have bad wires now.


http://www.summitracing.com/parts/TAY-82641/?rtype=10
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  #30  
Old 10-14-2011, 06:42 PM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

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Originally Posted by Walt View Post
The Physics lab has LCR meters that check inductance (L), capacitance (C), and resistance (R). Unfortunately, I forgot to take the plugs. Next trip now on Tuesday. Will report values then.
oldgeezer:

Tested 2 plugs with LCR meter: Capacitaznce = 36pF; Inductance = 0.026H. As reported previously, the resistance of 2 sets of used MOPAR OEM plugs was 1.389 and 1.480 ohms.

Anybody with other plug models for the HEMI want to test theirs and report out?
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  #31  
Old 10-14-2011, 08:53 PM
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Re: Champion Spark Plugs choices-CC,Iridium,Platinum, or Double Platinum?

This is the response to a question on SE-R.net regarding the difference between the types of plugs. It may shed some light on this issue. Looks like if the gap is widened you'd be alright. Also, maybe this is why some folks, especially with the 05's, have misfire problems when running platinums.

"I have heard that platinum plugs aren't very good for performance...how is this so?
All things being equal, a more powerful spark will create higher cylinder pressure which will create more power. The power of a spark is determined by its voltage (more voltage = more powerful spark).


Aside from variables such as cylinder pressure and A/F ratio, the amount of voltage required to jump across the gap of a given type of spark plug is determined by the plug gap. A smaller plug gap requires less voltage to jump across the gap and a larger plug gap requires more voltage to jump across the gap.


There is a way to reduce the amount of voltage required to jump across the gap of a plug. By increasing the number of sharp edges that the spark can jump from and to (as in SplitFire and Torquemaster plugs) or by using an electrode material that is a more efficient conductor than the standard steel material (like platinum) you can decrease the amount of voltage required to "jump the gap". The only problem is that these "specialty" plugs will produce a less powerful spark than a standard plug will at the same gap. This means that, as long as your ignition system can provide enough voltage to jump the gap on the spark plug all of the time, with these "specialty" plugs installed in your car your engine will produce less power than it will with standard spark plugs. The only way you can regain the power lost with these "specialty" plugs is to open their gap out farther (a wider gap requires more voltage to jump the gap).

I've seen a number of cases where people have installed SplitFire, Torquemaster or platinum plugs in their car in the place of standard spark plugs and have complained of reduced power. In all of these cases the specialty plugs were installed using the plug gap specified for the car's original standard plugs (with the exception of the Torquemaster, whose gap is not adjustable). The reduced spark power due to the reduced voltage requirement of these plugs was the culprit.


Nissan DID address this problem by specifying a larger plug gap when using platinum plugs (0.039" to 0.044") instead of standard plugs
(0.032" to 0.035"). In this case, the platinums will produce roughly the same spark energy as the standard plugs while providing an extended service interval (50K to 60K miles for platinums versus 20K to 30K miles for standards). "
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