Forgive any dumb questions here, but I've got a lot to learn and am not sure where to start, so let me begin rambling.
What does anybody know about the early Hartig ignition systems? I'm going to attempt to get mine reinstalled and running. Previous owners removed it due to undiagnosed intermittent problems. I suspect the problems were all wiring or sensor related.
The system has a sensor mounted in the bellhousing to read the flywheel ring gear. It looks kind of like early Motronic stuff, except that on the motronic car there are two sensors, one reading on the teeth and one reading back further on the flywheel (the first is getting rotation speed and the second is getting a reference position).
The ring gear and sensor (see press photo) appear to be specific Alpina parts. Any ideas on how the system works? Presumably counting teeth for rpm, but how's it getting a reference mark? Magnets imbedded in the ring to give it "missing teeth"? If not magnets, how else could it be getting a reference position? Or is it not reading teeth at all, and is strictly a "flying magnet" type setup?
If there are indeed magnets in this ring gear for it to read, do such magnets lose strength over time such that they would be the cause of erratic problems (as suggested by the mechanic that removed the system)?
What kind of sensors are these (pics below of the two I have with the car). Standard inductive rotation sensor or Hall effect? Think it would it be the same in function as a bosch/motronic or other readily available toothed wheel sensor? Some mounting work work would be required, but would they likely function the same? Or would it work, but I'd have issues with wrong output signal voltage or something like that? Could I adjust that by adjusting the air gap?
What should the air gap be on something like this? I believe my Alpina manual says 0.5mm. That's pretty tight, but maybe necessary if it's trying to read magnets deeper in that ring gear.
Pic of the two sensors I have is below. One is a later replacement offered by Alpina (I believe, still waiting for a reply from them). Note that both appear to have come in contact with gear teeth at some point, hence my question about air gap. And would you suppose these might still be functional? Can they be tested and how?
Looking forward to learning something about a new field for me here.
Thanks,
Mike
What does anybody know about the early Hartig ignition systems? I'm going to attempt to get mine reinstalled and running. Previous owners removed it due to undiagnosed intermittent problems. I suspect the problems were all wiring or sensor related.
The system has a sensor mounted in the bellhousing to read the flywheel ring gear. It looks kind of like early Motronic stuff, except that on the motronic car there are two sensors, one reading on the teeth and one reading back further on the flywheel (the first is getting rotation speed and the second is getting a reference position).
The ring gear and sensor (see press photo) appear to be specific Alpina parts. Any ideas on how the system works? Presumably counting teeth for rpm, but how's it getting a reference mark? Magnets imbedded in the ring to give it "missing teeth"? If not magnets, how else could it be getting a reference position? Or is it not reading teeth at all, and is strictly a "flying magnet" type setup?
If there are indeed magnets in this ring gear for it to read, do such magnets lose strength over time such that they would be the cause of erratic problems (as suggested by the mechanic that removed the system)?
What kind of sensors are these (pics below of the two I have with the car). Standard inductive rotation sensor or Hall effect? Think it would it be the same in function as a bosch/motronic or other readily available toothed wheel sensor? Some mounting work work would be required, but would they likely function the same? Or would it work, but I'd have issues with wrong output signal voltage or something like that? Could I adjust that by adjusting the air gap?
What should the air gap be on something like this? I believe my Alpina manual says 0.5mm. That's pretty tight, but maybe necessary if it's trying to read magnets deeper in that ring gear.
Pic of the two sensors I have is below. One is a later replacement offered by Alpina (I believe, still waiting for a reply from them). Note that both appear to have come in contact with gear teeth at some point, hence my question about air gap. And would you suppose these might still be functional? Can they be tested and how?
Looking forward to learning something about a new field for me here.
Thanks,
Mike
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