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Cylinder 4 misfire

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I love the funny math turns ratio has to do with the construction of the coil its self. Input voltage times the amount of turns around the primary side of coil then multiply that number by the turns around the secondary side of coil, this gives you the secondary potential.

Your product should be in volts, second the 8mm wires on most of todays late model vehicles are there due to huge secondary output that kinda shoots your cold spark theory to hell.

Seeing that none of you could not answer either of my 2 questions properly its better to just leave the lawnmower tecs to themselves.
 
Originally posted by: dmh1167
I love the funny math turns ratio has to do with the construction of the coil its self. Input voltage times the amount of turns around the primary side of coil then multiply that number by the turns around the secondary side of coil, this gives you the secondary potential.

Your product should be in volts, second the 8mm wires on most of todays late model vehicles are there due to huge secondary output that kinda shoots your cold spark theory to hell.

Seeing that none of you could not answer either of my 2 questions properly its better to just leave the lawnmower tecs to themselves.
Click to expand...

:roll:

I don't think you're impressing anyone.

If the math I did is funny please point out how. There is no possible way an HEI system is putting out a spark that is anywhere near 3,200,000 watts. A 1.5 millisecond would heat the air in the cylinder over 10,000 degrees F and I'm not just pulling that number out of the air. I did the math for a 350ci V8 and got over 13,000 degrees. I did use the molar specific heat at room temp/pressure (my thermo reference book is at work) so its not exact but the answer should be well over 10,000.
 
Since you asked Im happy to give the answer to an honest question the best I can, ignition coils have a primary side and a secondary side . The primary side consists of fine wire wrapped around an iron core. Lets say we put in 12 volts to a coil with 25 turns and for each turn we step up the voltage, 25 turns x 12 v = 300v not enough to get a hot spark but now we have an emf ( electro mag field) in the coil and 300 volts.

Now we kill the juice to the primary side, open some points, or a leg on a transistor dag there goes that EMF, in the primary side of the coil, it collapses and that 300 volts needs some ground to go to, instead it finds the secondary side of the coil with 100 turns of wire around an iron core still looking for ground but now very po'ed comming out at 30 kv down a secondary wire to a spark plug at the end.

Todays coils have many more turns of wire and input voltage is not restricted by a ballast resistor or ballast wire. They run whatever the alternator is putting out in voltage. Copper under these circustances burns away pretty quick rounding the sides of the spark plug making for a sloppy spark. A good place to see this in action is on if you can find a runner, old rig still using breaker points, Todays breaker points have no tungston in them, ok little if any, they are mostly copper even with a ballast and condenser Ive seen them cook in 5 k miles, copper spark plugs are the same story rounding off the sharp sides of the electrode sloping off performance and gas mileage. Tungston can handle lots of juice and not cook like copper but now its spendy stuff due to us tossing it in the local landfill for the past 110 years in the form of burned up light bulbs. When its gone thats it. Tungston wafers were solidered onto breaker points but no more all gone.

Im not saying copper plugs cant be run, what I am saying is paying a shop top dollar to put in non OE plugs based on what fits the hole and is cheap is very common and the extra work on the coil, plugwires, and ignition module as the plug burns away is false economy. I've pulled plugs gapped at 44 and after 30k miles the gap increased to 50 to 52 thousandths . This works modules and coils into the dirt a bit early. Good Luck Hope I answered your question . Good luck 🙂
 
Originally posted by: dmh1167
Hope I answered your question . Good luck 🙂
Click to expand...

I reread my post multiple times and I have not found me asking a single question. I only pointed out that the numbers you gave are completely ridiculous.

Anyways, copper plugs work fine, just for less time. For some people that's fine. They just need to understand the trade offs when they're picking out their parts.
 
Originally posted by: dmh1167
Im not saying copper plugs cant be run, what I am saying is paying a shop top dollar to put in non OE plugs based on what fits the hole and is cheap is very common and the extra work on the coil, plugwires, and ignition module as the plug burns away is false economy. I've pulled plugs gapped at 44 and after 30k miles the gap increased to 50 to 52 thousandths . This works modules and coils into the dirt a bit early. Good Luck Hope I answered your question . Good luck 🙂
Click to expand...

No, you've been saying that copper plugs get "spanked" by modern ignition systems, which is patently false. While it's true that copper plugs will only last between 15,000 and 30,000 miles while platinums may last 100,000 miles, the simple fact is that coppers have always needed replacement at 15,000 to 30,000 miles; this has nothing whatsoever to do with some mythical increase in coil voltage for modern engines.

You have also claimed that copper plugs are somehow lower quality than platinum and iridium plugs. This too is patently false. Platinum and iridium plugs offer a longer service life, but this is due to the inherent properties of the materials, not any difference in the "quality" of the plugs. In fact, given that many people who run high-performance engines choose to run copper plugs and change them often rather than running platinum or iridium because coppers allow higher performance, there are valid arguments that copper is higher "quality" with regard to performance while platinums are higher "quality" with regard to longevity. There are different ways to asses "quality".

You have also said that copper plugs will "foul" if used in a modern engine. Fouling is caused by contaminants in the combustion chamber, by the engine running excessively rich, or by using a plug that is the incorrect heat range. It is simply not possible for fouling to be caused by using a copper plug in an engine that calls for platinum or iridium plugs unless the copper pugs are of the wrong heat range.

Not one person in this thread has disputed that copper plugs have a shorter lifespan. What has been said, however, is that there are positive aspects to using copper plugs and that the tradeoff in lifespan is inherent to copper plugs and is not due to any additional voltage from modern ignition systems.

ZV
 
My 2008 Hemi has 16 plain Champion 570 plugs from the factory with a 30K change interval.

I have heard that it doesn't do well with any platinum or exotic plugs.

 
Quote" I reread my post multiple times and I have not found me asking a single question"

The embarassing part, quote " If the math I did is funny please point out how"

So I did, you read as well as I type.
 
Originally posted by: Zenmervolt

You have also claimed that copper plugs are somehow lower quality than platinum and iridium plugs. This too is patently false. Platinum and iridium plugs offer a longer service life, but this is due to the inherent properties of the materials, not any difference in the "quality" of the plugs. In fact, given that many people who run high-performance engines choose to run copper plugs and change them often rather than running platinum or iridium because coppers allow higher performance, there are valid arguments that copper is higher "quality" with regard to performance while platinums are higher "quality" with regard to longevity. There are different ways to asses "quality".
Click to expand...

For more on "quality," and to thoroughly confuse yourself, see Zen and the Art of Motorcycle Maintenance by Robert M. Pirsig.
 
Originally posted by: dmh1167
Quote" I reread my post multiple times and I have not found me asking a single question"

The embarassing part, quote " If the math I did is funny please point out how"

So I did, you read as well as I type.
Click to expand...

Not one single thing you have posted has had any relevance whatsoever to his math. If you intended to point out a flaw in his math, you have failed miserably.

ZV
 
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