Re: The dreaded distributor dimple
Mark, Dave, Duke;
Upon further review, my comment about 1 tooth off and points opening is indeed false. You are correct. I apologize. I thought I had this thing figured out, apparently I did not. This whole discussion is most interesting, but it is a brain teaser for people with limited IQ, like me. So let me try again, please.
The important thing here is that the relationship between point opening and rotor tip position has to be maintained over several valuables. The rotor tip has to be aligned with a cap contact when the points open and a spark is generated. This is what we are calling 'phasing'. The design is such that regardless of distributor clocking, gear dimple orientation, position of the distributor in the engine, initial advance, or centrifugal advance, this relationship is maintained. Some of these variables can be compensated for by simply changing the clocking position of the distributor, but there are limitations in doing this, mostly by the limited room of the vacuum can.
There is only one thing that changes this phasing, that being the vacuum advance. The vacuum can tugs on the points plate so the points open sooner, but that is all it does. Rotor and cap position do not change. So the rotor contact and the cap contact have to be wide enough to accommodate 8* of advance. Apparently they do, as the system works very well.
p.s. This discussion should have been a new thread, and not commandeered on Ed's dimple thread. But it is too late now, and I think Ed has had his questions answered.
Tell me what you think. All comments are welcome.
Dannnn
Mark, Dave, Duke;
Upon further review, my comment about 1 tooth off and points opening is indeed false. You are correct. I apologize. I thought I had this thing figured out, apparently I did not. This whole discussion is most interesting, but it is a brain teaser for people with limited IQ, like me. So let me try again, please.
The important thing here is that the relationship between point opening and rotor tip position has to be maintained over several valuables. The rotor tip has to be aligned with a cap contact when the points open and a spark is generated. This is what we are calling 'phasing'. The design is such that regardless of distributor clocking, gear dimple orientation, position of the distributor in the engine, initial advance, or centrifugal advance, this relationship is maintained. Some of these variables can be compensated for by simply changing the clocking position of the distributor, but there are limitations in doing this, mostly by the limited room of the vacuum can.
There is only one thing that changes this phasing, that being the vacuum advance. The vacuum can tugs on the points plate so the points open sooner, but that is all it does. Rotor and cap position do not change. So the rotor contact and the cap contact have to be wide enough to accommodate 8* of advance. Apparently they do, as the system works very well.
p.s. This discussion should have been a new thread, and not commandeered on Ed's dimple thread. But it is too late now, and I think Ed has had his questions answered.
Tell me what you think. All comments are welcome.
Dannnn
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