928 ignition... maximum possible advance/retard
11-25-2004, 03:08 PM
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Three Wheelin'
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928 ignition... maximum possible advance/retard
So I was doing some thinking and an interesting question dawned on me...
Lets say you had the ability to retard/advance ignition @ the EZF unit....
Since the distributer only connects the coil to the spark plugs at specific/defined times, that would limit the amount of advance/retard that you can introduce. I'm assuming that the contacts in the distributer are long enough for a few degrees of change, but does anyone know the maximum degrees that it can change? If you advanced or retarded too much, you would be telling the coil to fire before or after the contacts had already made contact.
Lets say you had the ability to retard/advance ignition @ the EZF unit....
Since the distributer only connects the coil to the spark plugs at specific/defined times, that would limit the amount of advance/retard that you can introduce. I'm assuming that the contacts in the distributer are long enough for a few degrees of change, but does anyone know the maximum degrees that it can change? If you advanced or retarded too much, you would be telling the coil to fire before or after the contacts had already made contact.
11-26-2004, 01:29 AM
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Originally Posted by mspiegle
So I was doing some thinking and an interesting question dawned on me...
Lets say you had the ability to retard/advance ignition @ the EZF unit....
Since the distributer only connects the coil to the spark plugs at specific/defined times, that would limit the amount of advance/retard that you can introduce. I'm assuming that the contacts in the distributer are long enough for a few degrees of change, but does anyone know the maximum degrees that it can change? If you advanced or retarded too much, you would be telling the coil to fire before or after the contacts had already made contact.
Lets say you had the ability to retard/advance ignition @ the EZF unit....
Since the distributer only connects the coil to the spark plugs at specific/defined times, that would limit the amount of advance/retard that you can introduce. I'm assuming that the contacts in the distributer are long enough for a few degrees of change, but does anyone know the maximum degrees that it can change? If you advanced or retarded too much, you would be telling the coil to fire before or after the contacts had already made contact.
11-26-2004, 02:19 AM
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Rich,
Thanks for confirming my thoughts. Since you know the ignition much better than I do - would you think that retarding ignition by 12 degrees at any point is possible?
Thanks for confirming my thoughts. Since you know the ignition much better than I do - would you think that retarding ignition by 12 degrees at any point is possible?
11-27-2004, 12:55 AM
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The manuals state that if the Hall sensor is not functioning correctly the spark is retarded by 6 degrees. So we know that the system can handle that. How much more I don't know.
