8 plug head firing sequence........
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8 plug head firing sequence........
Originally Posted by Bob Ayers
If anybody is interested, e-mail me at:
and I'll send you the coilpack schematic I made up. You can
see how a plug in each bank gets the opposite polarity spark.
That's why it is important to run double platinums, because the
outer electrode will erode in one bank, while the center electrode
wil erode in the other bank.....They also fire on every rev. of the crank,
twice as often as will a conventional ignition....
and I'll send you the coilpack schematic I made up. You can
see how a plug in each bank gets the opposite polarity spark.
That's why it is important to run double platinums, because the
outer electrode will erode in one bank, while the center electrode
wil erode in the other bank.....They also fire on every rev. of the crank,
twice as often as will a conventional ignition....
Originally Posted by Bob Ayers
They also fire on every rev. of the crank,
twice as often as will a conventional ignition....
twice as often as will a conventional ignition....
jd
Last edited by jimdandy; Aug 21, 2006 at 09:42 PM.
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Originally Posted by RangerPilot
Ok...and the point? Other than making the corrections...where'd you find this anyways?
jd I read the sticky due to the following post.
jd
Originally Posted by john112deere
2- Autolight double platinums. For some reason, these trucks don't like Bosch plugs, and due to the way the ignition system works, it will eat up single plat plugs real quick on one bank. There's a thread about it in the tech stickies at the top of the Ranger Forum page.
Last edited by jimdandy; Aug 21, 2006 at 11:09 PM.
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From: Greenvile, SC
When the coil is fired by the PCM, spark is delivered through the matched pair towers to their respective spark plugs. The spark plugs are fired simultaneously and are paired so that as one fires on the compression stroke, the other spark plug fires on the exhaust stroke. The next time the coil is fired the situation is reversed. The next pair of spark plugs fire according to the engine firing order.
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Originally Posted by 99Trigger3_0
Was that what were referring to Mr. Jim?
Well, it's kind of confusing. It says one fires on compression and one on exhaust. Both plugs in each cylinder fire at the same time whether compression or exhaust.
jd
Last edited by jimdandy; Aug 22, 2006 at 12:11 AM. Reason: spelling
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From: Greenvile, SC
During engine crank the PCM will fire two spark plugs simultaneously. Of the two plugs simultaneously fired one will be under compression the other will be on the exhaust stroke. Both plugs will fire until camshaft position is identified by a successful camshaft position sensor signal. Once camshaft position is identified, only the cylinder under compression will be fired.FMC
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Originally Posted by 99Trigger3_0
I thought this one was interesting too...
"During engine crank the PCM will fire two spark plugs simultaneously. Of the two plugs simultaneously fired one will be under compression the other will be on the exhaust stroke. Both plugs will fire until camshaft position is identified by a successful camshaft position sensor signal. Once camshaft position is identified, only the cylinder under compression will be fired.FMC"
Oops! After re-reading I see that they aren't talking about the inhibit circuit. Both your posts explain the single plug theory of operation.
jd
Originally Posted by RangerPilot
Either way, PM this to monsterbaby, either a link or your corrections,
that's what you should have done in the first place.
jd
Last edited by jimdandy; Aug 22, 2006 at 08:54 AM. Reason: additional info
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From: Connecticut
Originally Posted by jimdandy
Actually, both spark plugs in each cylinder fire at the same time. So plug errosion would be the same on each bank. Voltage on the waste spark plug is very low, 3/4k, and errosion would be minimal.
Two sets of plugs fire every other revolution of the crankshaft. jd
Two sets of plugs fire every other revolution of the crankshaft.
jd
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Monsterbaby will read this, and I am sure he will take the appropriate action he deems necessary.
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Looks like Jim doesn't want to respond. Probably because by now he realizes just how wrong and misleading the information is that he gave out.
By starting this thread, jimdandy has demonstrated two things very clearly to the entire forum:
1. That for some reason, he cannot let a day go by without taking a poke at Bob Ayers. It's almost as if he scanned the entire FTE site and all of Bob's previous posts in order to try and come up with something that he could prove Bob wrong on. "Petty" is the first word that comes to my mind regarding this kind of behavior.
2. That he doesn't know squat about how the Ford DIS/EDIS system is designed and how it operates. This is obvious from the misinformation he is trying to convey in his posts. The fact of the matter is, Bob's comments - as quoted by Jim above - are 100% accurate and correct. The two spark plugs Bob is refering to have nothing to do with the "dual plug" setup that Jim apparantly has in his mind. Bob's comments are specifically related to the two spark plugs that are in series electrically in the Ford DIS/EDIS "waste spark" design. In fact, in these two plugs DO INDEED FIRE WITH DIFFERENT POLARITY, RESULTING IN THE ELECTRODES ON THE PLUGS ERODING DIFFERENTLY. Now, if Jim (and some others) had taken the time to read the writeup that I made (with Bob's help), he could have cured his ignorance of DIS/EDIS before starting this thread and looking like a fool.
Summary of the Ford DIS/EDIS Ignition Systems
I agree that monsterbaby needs to be notified of this thread. But not because there is anything wrong with the stcky thread info, but instead, because it has become quite obvious that jimdandy is not interested in being a productive member of this forum or the FTE community. He spends his time thinking of ways to knock other members down, and then starts threads full of inaccurate information and confusing comments in order to fulfill that agenda.
We don't need his type around here, IMO.
By starting this thread, jimdandy has demonstrated two things very clearly to the entire forum:
1. That for some reason, he cannot let a day go by without taking a poke at Bob Ayers. It's almost as if he scanned the entire FTE site and all of Bob's previous posts in order to try and come up with something that he could prove Bob wrong on. "Petty" is the first word that comes to my mind regarding this kind of behavior.
2. That he doesn't know squat about how the Ford DIS/EDIS system is designed and how it operates. This is obvious from the misinformation he is trying to convey in his posts. The fact of the matter is, Bob's comments - as quoted by Jim above - are 100% accurate and correct. The two spark plugs Bob is refering to have nothing to do with the "dual plug" setup that Jim apparantly has in his mind. Bob's comments are specifically related to the two spark plugs that are in series electrically in the Ford DIS/EDIS "waste spark" design. In fact, in these two plugs DO INDEED FIRE WITH DIFFERENT POLARITY, RESULTING IN THE ELECTRODES ON THE PLUGS ERODING DIFFERENTLY. Now, if Jim (and some others) had taken the time to read the writeup that I made (with Bob's help), he could have cured his ignorance of DIS/EDIS before starting this thread and looking like a fool.
Summary of the Ford DIS/EDIS Ignition Systems
I agree that monsterbaby needs to be notified of this thread. But not because there is anything wrong with the stcky thread info, but instead, because it has become quite obvious that jimdandy is not interested in being a productive member of this forum or the FTE community. He spends his time thinking of ways to knock other members down, and then starts threads full of inaccurate information and confusing comments in order to fulfill that agenda.
We don't need his type around here, IMO.
Last edited by Rockledge; Aug 22, 2006 at 12:26 PM.
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If the PCM fires the coils at the same moment how would the cylinder be at compression and exhaust at the same time. I think what you are referring to is
this, a four cylinder engine has a 180 degree crankshaft, # 1 is up to fire and #4 is
up on exhaust, since a signal from the crank to fire either 1 or 4 comes from the same point both coils are triggered. The coils which we call waste spark are really
center tapped coils (since we need one side of anything electrical to be at the opposite polarity to get current to flow) The center then is grounded as is the sparkplug shell or threaded part and the other end of the two windings goes to the center electrode.
The firing of cylinders 2 and 3 happens the same way 180 degrees later. I hope this makes this pretty clear as mud maybe!
this, a four cylinder engine has a 180 degree crankshaft, # 1 is up to fire and #4 is
up on exhaust, since a signal from the crank to fire either 1 or 4 comes from the same point both coils are triggered. The coils which we call waste spark are really
center tapped coils (since we need one side of anything electrical to be at the opposite polarity to get current to flow) The center then is grounded as is the sparkplug shell or threaded part and the other end of the two windings goes to the center electrode.
The firing of cylinders 2 and 3 happens the same way 180 degrees later. I hope this makes this pretty clear as mud maybe!