ignitor operation explanation please
#1
ignitor operation explanation please
greetings,
returned from t.o with a couple of coils and a leading ignitor. i am wondering if a leading ignitor can be used to replace a trailing. why or why not? could someone explain to my exactly what is happening with regards to ignitor operation?
thanks,
norman ng
returned from t.o with a couple of coils and a leading ignitor. i am wondering if a leading ignitor can be used to replace a trailing. why or why not? could someone explain to my exactly what is happening with regards to ignitor operation?
thanks,
norman ng
#2
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Do you want the long or the short version?
Firstly, yes the leading and trailing can be interchanged since they're exactly the same.
All the ignitor basically does is switch the electrical field inside the ignition coil on and off.
When you apply 12v to a coil a magnetic field is built up around the primary windings. Current flows through the positive terminal into the winding, out through the negative terminal and completes it's circuit to ground through the ignitor. Now, when the reluctor on the dizzy shaft passes the pickup it switches off the ignitor. This causes the magnetic field to break down and induce a much higher voltage into the secodary winding which then flows through the plug wires and dizzy cap to your spark plugs.
Firstly, yes the leading and trailing can be interchanged since they're exactly the same.
All the ignitor basically does is switch the electrical field inside the ignition coil on and off.
When you apply 12v to a coil a magnetic field is built up around the primary windings. Current flows through the positive terminal into the winding, out through the negative terminal and completes it's circuit to ground through the ignitor. Now, when the reluctor on the dizzy shaft passes the pickup it switches off the ignitor. This causes the magnetic field to break down and induce a much higher voltage into the secodary winding which then flows through the plug wires and dizzy cap to your spark plugs.
#4
Lapping = Fapping
iTrader: (13)
The ignitor employs a transistor which, by its nature, is able to turn the voltage to the coil off very quickly. It also allows full 12V (or 13-14V hehe) to go to the coil instead of the measely 6 or 9V from a ballast resistor (used on points ignitions). Switching the coil off as quickly as possible is very important. It's a square wave, man!
#5
Driven a turbo FB lately?
iTrader: (1)
Originally posted by jeremy
ENGLISH MAN, ENGLISH
ENGLISH MAN, ENGLISH
Jeremy needs donations to me so he can get rid of that points crap on his car
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Revhed
The Haines manual states the resistance across two of the poles (I do not have access to which poles at the moment) on an ignitor should be less than 1k Ohm. All the ignitors I have meas. 3 & 4k Ohms. The engine runs except for a miss fire at cruise rpm which we believe is a carburator problem.
Do you have any comments on the subject of ignitor resistance?
THC
The Haines manual states the resistance across two of the poles (I do not have access to which poles at the moment) on an ignitor should be less than 1k Ohm. All the ignitors I have meas. 3 & 4k Ohms. The engine runs except for a miss fire at cruise rpm which we believe is a carburator problem.
Do you have any comments on the subject of ignitor resistance?
THC
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#8
so the ignitor's basic function is to help in the generation of a stong enough current which allows the spark plugs to operate at their greatest point of efficiency? is that why there is no obvious sign of a bad trailing ignitor other than a bad tach -the engine continues to operate albeit inefficiently?
sorry, this is a nagging itch with me as i have a bad tachometer. after searching the forum for possible causes, i find it difficult to accept that something which seems important to the car (the ignitor), would have no noticeable effect on the car other than a non-working tachometer.
thanks,
norman ng
sorry, this is a nagging itch with me as i have a bad tachometer. after searching the forum for possible causes, i find it difficult to accept that something which seems important to the car (the ignitor), would have no noticeable effect on the car other than a non-working tachometer.
thanks,
norman ng
#9
The igniter fires the coil, without the coil firing there is no trailing spark. The leading spark alone can run the engine, but not as well as both. A symptom is the non-working tach, but the true sign is no trailing spark. your tach could be dead for other reasons.
#10
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Originally posted by THC
Revhed
The Haines manual states the resistance across two of the poles (I do not have access to which poles at the moment) on an ignitor should be less than 1k Ohm. All the ignitors I have meas. 3 & 4k Ohms. The engine runs except for a miss fire at cruise rpm which we believe is a carburator problem.
Do you have any comments on the subject of ignitor resistance?
THC
Revhed
The Haines manual states the resistance across two of the poles (I do not have access to which poles at the moment) on an ignitor should be less than 1k Ohm. All the ignitors I have meas. 3 & 4k Ohms. The engine runs except for a miss fire at cruise rpm which we believe is a carburator problem.
Do you have any comments on the subject of ignitor resistance?
THC
As long as you have leading and trailing spark I wouldn't worry about the ignitors.
#11
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Originally posted by ncmn
so the ignitor's basic function is to help in the generation of a stong enough current which allows the spark plugs to operate at their greatest point of efficiency? is that why there is no obvious sign of a bad trailing ignitor other than a bad tach -the engine continues to operate albeit inefficiently?
sorry, this is a nagging itch with me as i have a bad tachometer. after searching the forum for possible causes, i find it difficult to accept that something which seems important to the car (the ignitor), would have no noticeable effect on the car other than a non-working tachometer.
thanks,
norman ng
so the ignitor's basic function is to help in the generation of a stong enough current which allows the spark plugs to operate at their greatest point of efficiency? is that why there is no obvious sign of a bad trailing ignitor other than a bad tach -the engine continues to operate albeit inefficiently?
sorry, this is a nagging itch with me as i have a bad tachometer. after searching the forum for possible causes, i find it difficult to accept that something which seems important to the car (the ignitor), would have no noticeable effect on the car other than a non-working tachometer.
thanks,
norman ng
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