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Old 22nd February 2010, 20:20   #11
blackxs
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I personally know people with the 540 M62 engine that have erratic idle and bad performance and economy with non-copper or 4-prong spark plugs. Electricity takes the path of least resistance, you could have 2 prongs or 60, it will only jump from one prong, there is no point to 4 prong plugs other than when one prong fouls they can still function. Many older cars used single prongs in fact. Copper is also the best conductor of electricity and I dont understand why you would change the plugs that the engine were designed to work with, to some "iridium 4 prong" or "super duper platinum XXX++++ awesome plugs" ...its all marketing gimmick if they did not come with the car. Frankly, the car was designed to work with certain plugs and that is what you should replace them with. I am not sure if our cars came with the NGK BKR6EK which are copper or platinum NGK BKR6EQUP plugs but when I get mine replaced I use OEM

I will always use what plugs came on my car because that is what the car was designed to run. Maybe thats just me but I have heard too many horror stories with iridium plugs or any non-OEM plugs in general to even consider wasting money. Spark plugs do a simple job. They spark.
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Old 22nd February 2010, 20:24   #12
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I've had good experiences with Denso Irdiums on my E36 M52 engine before, right currently running OEM NGKs IIRC
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Old 22nd February 2010, 20:37   #13
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They came with the BKR6EQUP,so your copper thesis does not hold
And btw,the electrodes on the sparks are about the the best path to chose for the spark as you stated in your post....
So there might be a reason for two or 4 electrodes...

And my idle is perfect smooth

The OEM platinium long life sparks.The older they get,the weaker the spark gets.

I rather change my spark plugs frequently with every second oil service I do than trusting the NGK are still good after after 40k because they are long life(like the tranny fluid)...

And I know enough guys who use them also under race conditions,without power loss or failure.

The S62 was designed to use the spark plugs of a certain heat range and not of a certain brand!

Last edited by vantaam5; 22nd February 2010 at 20:38.
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Old 22nd February 2010, 20:37   #14
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Vanta: Spark Plug Indexing - Holdenpaedia

Can find no evidence with regards to shrouding, but I mean the 4 tips cover up the spark a little - indexing of plugs backs up this theory.

Sorry Jamie, am interested in best plugs too, have always sworn by NGK iridiums, or Denso Iridiums if you're rich...
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Old 22nd February 2010, 20:37   #15
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Quote:
Originally Posted by JustinM5 View Post
You don't mind the shrouding of the spark?
Evidence for this is in people indexing their plugs.
I don't know how much difference it makes though, but never liked the super 4's - yet you use them and are super knowledgable

Blackxs - Why use copper?
Not heard this before mine has iridiums which I don't think come in copper?!
Copper is the best conductor of electricity second to Silver. Iridium is highly corrosion and heat resistant, but is not very conductive of electricity. Iridium is an element and so is Copper, Iridium plugs may be copper coated but are a different element and type of plug.

Like I said I will only ever use OEM plugs. Use whatever you want in your car...
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Old 22nd February 2010, 20:39   #16
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Quote:
Originally Posted by vantaam5 View Post
They came with the BKR6EQUP,so your copper thesis does not hold
And btw,the electrodes on the sparks are about the the best path to chose for the spark as you stated in your post....
So there might be a reason for two or 4 electrodes...

And my idle is perfect smooth

The OEM platinium long life sparks.The older they get,the weaker the spark gets.

I rather change my spark plugs frequently with every second oil service I do than trusting the NGK are still good after after 40k because they are long life(like the tranny fluid)...

And I know enough guys who use them also under race conditions,without power loss or failure.
What? My theory does not hold? Copper is the second best conductor to silver. This is a well known fact :dunno My theory was that you should use OEM plugs, which you do, so that is my "theory"

...like I said, do what you want. I will do what I want.
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Old 22nd February 2010, 20:47   #17
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Quote:
Originally Posted by JustinM5 View Post
Vanta: Spark Plug Indexing - Holdenpaedia

Can find no evidence with regards to shrouding, but I mean the 4 tips cover up the spark a little - indexing of plugs backs up this theory.

Sorry Jamie, am interested in best plugs too, have always sworn by NGK iridiums, or Denso Iridiums if you're rich...
Thanks for the link,Justin!
The combustion chamber layout on the S62 is completely different than the example shown.
The slight cover is due to what Bosch calls air cushion principle

Copy of the spec from the Bosch homepage:


Air gap
Surface air-gap

Spark gap:



In the case of spark plugs with four ground electrodes, the spark ignites the air/fuel mixture in much the same way as in plugs with two ground electrodes, that is, either as an air gap or as a surface air-gap. With the four ground electrodes of the Super 4 spark plug, this results in eight possible spark gaps.
Which of these spark gaps is chosen, is usually quite random. The sparks are distributed evenly around the insulator nose. If the insulator nose is contaminated at any point (e.g. with soot), the spark will skim over the contamination and jump from there to the nearest ground electrode. In such a case, the spark also simultaneously burns off the dirt.



Even electrode wear:


Since the probability of spark propagation is equal for all electrodes, wear on the ground electrodes is distributed evenly over all four electrodes. The Ohmic resistance implemented in the conductive glass seal reduces burn off and thus contributes towards reducing electrode wear.


Heat range:



The silver-plated center electrode conducts the heat well. This reduces the danger of auto-ignitions due to overheating and extends the safe working range into higher temperatures. Thanks to surface-gap formation, self-cleaning occurs even at low temperatures. The Super 4 spark plug thus covers at least two of the heat ranges of conventional spark plugs. The result of this is that a large number of vehicles (even those with conventional spark plugs) can be retrofitted with a relatively small number of spark plug types.


Spark plug efficiency:


Thanks to the thin shape of the ground electrodes in the Super 4 spark plug, less power is extracted from the spark than is the case with conventional spark plugs. Spark plug efficiency increases because the air/fuel mixture has up to 40% more power available for every ignition.


Probability of ignition:



The probability of the mixture being reliably ignited decreases as the air ratio increases (lean mixture, l > 1). In laboratory tests, reliable ignition of the mixture was guaranteed with the Super 4 spark plug to l = 1.55, while with standard spark plugs in this range, more than half of all mixture ignitions were unsuccessful.
Benefits:

The Super 4 spark plug displays the following improved features over conventional spark plugs:




Greater ignition reliability thanks to eight possible spark gaps.




Self-cleaning thanks to surface-gap technology.




Extended heat range.

The Super 4 spark plug can also be used in older vehicles, allowing them access to the benefits of modern spark plug technology:

Behavior in cold starts:


Thanks to the improved low-temparature behavior and self-cleaning feature, up to three times more cold starts (starting the engine without previously running it) are possible than with conventional spark plugs.

Environmental protection and protection for the catalytic converter:


The improved cold start behavior and increased ignition reliability even in the warm-up phase reduce the proportion of uncombusted fuel and thus bring down HC-emissions. This also has the effect of extending the service life of the catalytic converter.

Enhanced acceleration:


Air-fuel mixture deposits occur in driving primarily during strong acceleration. The Super 4 spark plug from Bosch with increased ignition probability prevents possible ignition misses and therefore guarantees continuous acceleration.

In a trial, acceleration from 30 to 120 km/h in third or fourth gear resulted in a value improved by 0.4 s in each case. The acceleration distance decreases by five meters, providing driver and passengers with improved safety during overtaking.

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Old 22nd February 2010, 20:51   #18
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blackxs,meant that your theory does so far not hold because there are the platinium plugs in our cars and not normal copper ones(as you refered to are used,or did I get that wrong?)...

Copper is the best conductor of electricity,no doubt about that!

If I got you wrong,apologies for that!
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Old 22nd February 2010, 20:51   #19
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Self-cleaning... lots of marketing talk...

I would love to see a real dyno comparing new OEM NGK plugs vs. new Bosch 4-prongs directly before and after install of each plugs, with a few runs with each plug.
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Old 22nd February 2010, 21:00   #20
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Forget the self cleaning bs
But what makes perfect sense to me is the probability of ignition with that layout.
And as I said,I made good experiences with them,change spark plugs very often,so the NGK make no sense to me.

But everyone uses what he likes best,so throw in whatever you want to use,gentlemen!As long as it is the same heat range
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