Re: Points, Dwell???

["Jeff Tarquinio" <tark_terra@domain.elided>]

Thanks, John, Jason, That helps alot, I will remeasure my gap/dwell tonight.
Thanks again.
---
Layda,
Tark
'77 Terra 345/T19/D20
   Survivor of '98 Scout Nationals
'80 Scout II 345/TF727/single speed tc
   Clean machine



On Mon, 21 Dec 1998 17:43:20   John A. Landry wrote:
>In a brilliant stroke of genius, "Jeff Tarquinio"
><tark_terra@domain.elided> blurted out:
>
>>I still don't know about the dwell of the points though.  If anyone knows what it is supposed to be, I would appreciate it.  As of now I have 28 degrees of dwell and maybe .050 point gap (a guess) I just set it where it "looked good".
>
>Tark,
>
>As Jason already mentioned, the point gap is supposed to be set at .019"
>when the points are brand new.  Points that are being reset are adjusted to
>.016".  The reason for the difference is because burning of the points
>through normal use makes accurate measuring the actual point gap
>impossible.  When you use a feeler gauge between used points, you're only
>measuring between the high spots of the jagged contact surfaces... not the
>actual gap where these jagged surfaces mate.  The smaller measurement
>compensates for this problem.
>
>As far as dwell goes, it should be from 28 to 32 degrees.  So if you in
>fact have 28 degrees, I wouldn't try and adjust it further.  The "dwell" is
>also known as the contact point "angle."  This dwell measurement is the
>number of degrees of cam rotation that the points remain closed and are
>saturating the primary field of the coil.  As the point gap gets smaller,
>the dwell gets larger and vice versa.  As the dwell gets larger, the
>ignition timing is retarded.  So, you *always* adjust the point gap and
>check the dwell *first* and then check and reset the timing.
>
>By the way, rotating the distributor 1/2 degree changes the ignition timing
>by 1 degree.  This is because the distributor turns at 1/2 engine speed.
>
>Merry Christmas,
>
>John L.
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