Screamin deamon coil pack

[Big Jim M]

Nope! Nope! Nope!!

The increased plug gap is the key here; that's what gives
better performance. And a higher voltage/joules rated coil
will fire a wider gap, so it's true that a performance coil
combined with wider gaped plugs will give more performance.

In thumbing thru some 3.0 specs, I see the plug gap spec for pre-06's
is .044", and the gap for post 06's is .055". That tells me Ford
has a better coil for the later models (possibly COP?)......

What some here need is a little SPARK 101! What the hell difference does the plug gap make?

Well I'll tell ya.. Back in the carb days the plug gap was .030 or thereabouts.. Then we started using injection.. Now we have improved injection.. What difference does this make to the plug gap? (you should ask yourself).. But you didn't so I will tell you.

The carbed engines had an overly RICH mixture, got bad milage. The plugs were gapped at the .030 because there was always enough rich fuel in that small gap to start the fire when the spark occured.

Then the early fuelies came around and it was found that the engine sometimes missed...because there wasn't enough lean fuel in the .030 gap to start the fire. So the gap was increased to .044 to make sure there was ALWAYS enough fuel to start the fire.

Nowadays with the even smarter computers the mixture is even LEANER and many vehicles require the .055 gap to have enough fuel..consistantly.. in the gap to start the fire.

Each of these improvements in fuel economy required a slightly stronger coil..
So Now, if you can read, you see WHY the gap has been changed. It is all about starting the fire, with the newer leaner fuel, in the chamber and economy.

Now if your present coil and gap is consistantly lighting the mixture, there is no reason to swap to something else. Once lit the fire is the same fire, nothing can change that! NOTHING can improve the fire!

There can be NO GAIN form ANY coil or plug or plug gap, if what you have now is running smoothly.

The worlds greatest, most highly advertised coil, will NOT improve on a good running engine.. IT IS IMPOSSIBLE!

No matter what the driveway cowboys tell ya.. It simply cannot happen.
Also a wider gap will not do one damn thing.. If your factory gap is running smoothly.. wider ain't better!

And NO! Thinking the different coil did something for your ride ain't true! It is a "pride of possession" thing. Guys are slow to admit they have been TAKEN by the advertisements.. They seldom admit that nothing has happened since they spent the dollars to get a so-called "improvement" to their rides.

Big Jim

 

[Bob Ayers]

And NO! Thinking the different coil did something for your ride ain't true! It is a "pride of possession" thing. Guys are slow to admit they have been TAKEN by the advertisements.. They seldom admit that nothing has happened since they spent the dollars to get a so-called "improvement" to their rides.

Big Jim

+1



It's also called the "placebo effect"!!


A good analogy to combustion is pregnancy! There is NO WAY to get MORE combustion, or be MORE pregnant!

 

[betomonroy]

So... If you are not running a Hig Rev. High Horsepower High Dollar engine... It is not recomendable that You use the Screamin' Demon coil or any other intended for these types of engines in a stock motor. It is simply NOT WORTHY OF.

 

[betomonroy]

Oh... and BTW. We also use to have some other chemicals in our fuels of the past wich made it more easy to burn than todays. That is also a contributing factor. Is not only the octane rating. Try using 110 octane fuel in your car and see if you like how it runs. (It will run like shit).

 

[Blueb2]

Sparks

BIG SPARK GOOD

little spark bad

 

[Big Jim M]

Nope!

BIG SPARK GOOD

little spark bad

Big spark, little spark...same same.. Both lite fire...fire make go.. Fire same, same.. go all time same same..
Problem be listen to salespeople..not listen to real facts..
Big JIm

 

[Bob Ayers]

So... If you are not running a Hig Rev. High Horsepower High Dollar engine... It is not recomendable that You use the Screamin' Demon coil or any other intended for these types of engines in a stock motor. It is simply NOT WORTHY OF.

If you want reliability, NO!

 

[Big Jim M]

I would say

So... If you are not running a Hig Rev. High Horsepower High Dollar engine... It is not recomendable that You use the Screamin' Demon coil or any other intended for these types of engines in a stock motor. It is simply NOT WORTHY OF.

Anyone can use any coil they'd like to use.. I would like for them to KNOW what and why they are using that particular coil. If they take out a perfectly good coil to install a supposedly "high performance" one thinking they would GAIN some power or fuel economy...I want them to know they are WRONG in their reason for changing coils.
If one KNOWS there will be no difference when they install the new coil then I think they should spend the time and money if they'd like.
Having some nice YELLOW plug wires and a RED coil screwed down under the hood might account for something.. BUT outside of beauty there will be no other gains.
Big Jim

 

[triumphrider-1]

What some here need is a little SPARK 101! What the hell difference does the plug gap make?

Well I'll tell ya.. Back in the carb days the plug gap was .030 or thereabouts.. Then we started using injection.. Now we have improved injection.. What difference does this make to the plug gap? (you should ask yourself).. But you didn't so I will tell you.

The carbed engines had an overly RICH mixture, got bad milage. The plugs were gapped at the .030 because there was always enough rich fuel in that small gap to start the fire when the spark occured.

Then the early fuelies came around and it was found that the engine sometimes missed...because there wasn't enough lean fuel in the .030 gap to start the fire. So the gap was increased to .044 to make sure there was ALWAYS enough fuel to start the fire.

Nowadays with the even smarter computers the mixture is even LEANER and many vehicles require the .055 gap to have enough fuel..consistantly.. in the gap to start the fire.

Each of these improvements in fuel economy required a slightly stronger coil..
So Now, if you can read, you see WHY the gap has been changed. It is all about starting the fire, with the newer leaner fuel, in the chamber and economy.

Now if your present coil and gap is consistantly lighting the mixture, there is no reason to swap to something else. Once lit the fire is the same fire, nothing can change that! NOTHING can improve the fire!

There can be NO GAIN form ANY coil or plug or plug gap, if what you have now is running smoothly.

The worlds greatest, most highly advertised coil, will NOT improve on a good running engine.. IT IS IMPOSSIBLE!

No matter what the driveway cowboys tell ya.. It simply cannot happen.
Also a wider gap will not do one damn thing.. If your factory gap is running smoothly.. wider ain't better!

And NO! Thinking the different coil did something for your ride ain't true! It is a "pride of possession" thing. Guys are slow to admit they have been TAKEN by the advertisements.. They seldom admit that nothing has happened since they spent the dollars to get a so-called "improvement" to their rides.

Big Jim

Its like you stole my engine design book/notes and are reciting them back to the class.

I would like to add one thing though. Running a wider gap has the potential to ignite the mixture sooner. Igniting it sooner will give the chamber more time to burn completely before the exhuast valve starts to open. But at the same time it will only be fractions of a second sooner.

 

[colinrmitchell]

Big spark, little spark...same same.. Both lite fire...fire make go.. Fire same, same.. go all time same same..
Problem be listen to salespeople..not listen to real facts..
Big JIm

Haha, you sound like Master Blaster!

 

[Big Jim M]

Howdy Bike rider

You wrote:

I would like to add one thing though. Running a wider gap has the potential to ignite the mixture sooner. Igniting it sooner will give the chamber more time to burn completely before the exhuast valve starts to open. But at the same time it will only be fractions of a second sooner.


Those fractions of seconds are so small as to never be seen by an engine any of our readers may have in their rides.

I must agree that you do have a point that could be seen in mathamatics.. however, in application, the wider gap would be unnoticed by the engine or driver. The flame travels at such speed that the small possible gain is insignificant to the process.

And you were correct...I did read your book....

Big Jim

 

[Bob Ayers]

Its like you stole my engine design book/notes and are reciting them back to the class.

I would like to add one thing though. Running a wider gap has the potential to ignite the mixture sooner. Igniting it sooner will give the chamber more time to burn completely before the exhuast valve starts to open. But at the same time it will only be fractions of a second sooner.

It's the other way around....A wider gap requires a higher voltage to jump the gap, which takes the coil 10's of uS (microseconds) longer to generate,
so it will be a wash.

 

[triumphrider-1]

Those fractions of seconds are so small as to never be seen by an engine any of our readers may have in their rides.

I must agree that you do have a point that could be seen in mathamatics.. however, in application, the wider gap would be unnoticed by the engine or driver. The flame travels at such speed that the small possible gain is insignificant to the process.

And you were correct...I did read your book....

Big Jim

Yeah, thats why I put that at the end.

It's the other way around....A wider gap requires a higher voltage to jump the gap, which takes the coil 10's of uS (microseconds) longer to generate,
so it will be a wash.

Yeah, I thought about that as I typed, but it would need to be compared against a 'standard" gap to increased gap. I have a feeling that the increased gap would make up more time with the air charge compared to the build up in more voltage, but it is just a feeling.

 

[Blueb2]

Spark

Spark Spark

 

[cul8ri1]

I would not recommend it.
My demon coil pack for my 2005 3.0L was in for not even a year, it died yesterday on my way home. Only 5 cylinders were firing. I got home and put the factory one back on(good thing I kept it). Worked like a charm and I didn't even put the spark plug gap back to factory spec.