Oops, I meant the points are connected in parallel.
On Jul 17, 2006, at 3:07 PM, Bill Babcock wrote:
> If you are going to try to use dwell to set the individual points
> then yes, you have to block the other set open. The engine won't
> run for shit when you block open the opening points. The entire
> reason for having dual points is that the dwell (the number of
> degrees that the electricity is flowing into the coil) is much
> longer--this gives the coil longer to saturate and ensures you get
> a good spark even at higher RPM. You don't really want to set the
> points that way though. The combined dwell (the period from when
> the closing point closes until the opening point opens) should be
> from 70 to 75 degrees, and that's not a bad quick check to ensure
> your points are in the ballpark.
>
> Set your points at .020" and make sure your timing is fine, then
> check combined dwell.
>
> One thing to pay attention to with newer Mallory points is the wear
> of the rubbing block. They seem to have gone to a much stiffer
> spring--I don't know why. If you don't keep the cam lubed and/or
> don't check every now and then you'll find the point gap closes up.
> Dwell is a nice quick check for problems.
>
> Remember that the closing points don't do anything to timing--just
> the opening points. The way these things work is that the points
> are connected in series, the "closing" points open first, but
> nothing happens because the opening points are still closed. then
> the cam reaches the opening points and electricity is cut off to
> the coil. The magnetic field collapses and you get a spark. A tiny
> bit of rotation later the closing point closes and electricity
> flows to the coil again, much sooner than the opening point could
> restore power without a very sharp cam ramp and hard springs. then
> the opening point closes and nothing happens.
>
>
> On Jul 17, 2006, at 1:28 PM, William G Rosenbach wrote:
>
>> On a dual point, aren't you supposed to read dwell on each set
>> individually and get an average of the two?
>> Bill
>>
>> On Mon, 17 Jul 2006 14:21:30 -0500 "Jack W. Drews"
>> <vinttr4@geneseo.net>
>> writes:
>>> I'm installing a Mallory Dual Point to replace the ten year old
>>> brain
>>>
>>> box that really didn't have much brains anyway.
>>>
>>> Question regarding points setting -- they don't give a gap but they
>>>
>>> do give a dwell. On my distributor, with the points set at .015 from
>>>
>>> the factory, the dwell reads 50. Is my dwell meter goofy or should I
>>>
>>> really reduce the points gap that much?
>>>
>>> Thanks
>>>
>>>
>>> uncle jack
>>>
>>>
>>>
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