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ACinSC 
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 Topic: D 15 dwell degrees
Posted: 06 Feb 2024 at 1:14pm |
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Anyone know what it should be ? I know my old C 10 is 28 - 32 degrees . If I'm reading it right my dwell meter reads 36 degrees on the D 15 . Thanks !
Edited by ACinSC - 06 Feb 2024 at 1:21pm
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steve(ill)
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Posted: 06 Feb 2024 at 1:49pm |
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I just set the point gap to .020 ......... and make sure the advance works and your firing at FIRE.
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Like them all, but love the "B"s.
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ACinSC
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Posted: 06 Feb 2024 at 2:50pm |
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Thanks Steve , pretty sure I set my gap at 022 . Points have been in there a while . Just checked the timing and it's on F-25 at W.O.T. Does move around a good bit . Tractor runs good just wanted to use the 'new' timing light and dwell meter I bought today off FB . They're so old they were made in the USA . Thanks , again !
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Ed (Ont)
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Posted: 06 Feb 2024 at 5:12pm |
Yes your old C10 is 28-32 degrees dwell. I thought the 4 cylinders were like 45 dwell but can't remember for sure. As Steve said set points to .020 and your dwell will be correct. Then set time to fire mark as you have done. 
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ACinSC
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Posted: 06 Feb 2024 at 5:54pm |
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Thanks Ed!
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Steve in NJ
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Posted: 08 Feb 2024 at 7:29am |
Dwell should be 30-34 degrees depending on how you set the points. I usually pull em' in at around 30-32 on the 504 machine after I rebuild our customer's Distributors. A .020 point gap usually dwells out around 29-30. HTH. I might add that a good set of points will hold solid around 2200 rpm. I use SMP's Blue Streak points in all my Distributors unless I'm building a Distributor for a customer that wants an E.I. installed. (the better way to fly)
Steve@B&B
Edited by Steve in NJ - 08 Feb 2024 at 7:32am
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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ACinSC
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Posted: 08 Feb 2024 at 8:08am |
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Thanks Steve B. The points in my D 15 came from you. Guess my dwell is pretty close , easy to remember as it's close to my my C 10 dwell . Good info! Could a worn out distributer cause the timing mark to drift when checking it with a timing light? Thanks again
Edited by ACinSC - 08 Feb 2024 at 11:33am
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Les Kerf
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Posted: 08 Feb 2024 at 8:33am |
 ACinSC wrote:
... Could a worn out distributer cause the timing mark to drift when checking it with a timing light? Thanks again |
Yes.
Also wear in the gear train driving the distributor.
I prefer setting the points/dwell toward the max because the rubbing block wear will tend to decrease it.
If it runs well enough to satisfy you then don't sweat the petty stuff.
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ACinSC
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Posted: 08 Feb 2024 at 10:34am |
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Yeah Les , it's running good . I was mostly curious . Thanks
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Les Kerf
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Posted: 08 Feb 2024 at 3:05pm |
Les Kerf wrote:
ACinSC wrote:
... Could a worn out distributer cause the timing mark to drift when checking it with a timing light? Thanks again |
Yes.
Also wear in the gear train driving the distributor.
I prefer setting the points/dwell toward the max because the rubbing block wear will tend to decrease it.
If it runs well enough to satisfy you then don't sweat the petty stuff. |
ARRGGHH!
Brain cramp!  That's confusing  Set the points toward the max opening, which will be minimum dwell; as the rubbing block wears, the gap will decrease, thus increasing the dwell.
Sorry about that.  |
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ACinSC
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Posted: 08 Feb 2024 at 3:38pm |
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Think book calls for.022 point gap, so as it wears gap gets smaller and dwell increases? That is confusing. Thanks Les
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Steve in NJ
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Posted: 08 Feb 2024 at 6:58pm |
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Good job Ed!
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Les Kerf
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Posted: 08 Feb 2024 at 7:27pm |
ACinSC wrote:
Think book calls for.022 point gap, so as it wears gap gets smaller and dwell increases? That is confusing. Thanks Les |
Correct.
Dwell is the amount of degrees of rotation that the points are closed; the longer the points are closed the more time available for the coil to saturate (not really a problem on low-speed engines like our tractors).
If the points are barely opening, like say 0.005" the dwell would be quite high, if the ponts were opening really wide like 0.060" they may not even close at all, and if they did the dwell would be very low.
Dwell is really just a means of checking the gap without needing to open the distributor cap.
You can also check the condition of the points with a good multimeter.
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Ed (Ont)
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Posted: 08 Feb 2024 at 7:49pm |
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Great thread. So I started looking in some of my old GM and Chilton manuals in case I had brain fade. LOL. So all the GM stuff is in the 28-34 range for dwell. As everyone said. That includes 4 cyl, 6 cyl, and 8 cyl. I have some original gm manuals for 69 and 70. Lists specs for distributors including dwell, point gap, amount of vacuum and mechanical advance. Great stuff. Now the mopar and Ford stuff is a bit different. The Ford Pinto 4 cyl lists .025 point gap and 45 degrees dwell! We used to check dwell only on Chev V8 since you could adjust with engine running by using your Allen key thru the window. I would set dwell to 29 degrees and then set timing. All the others we set the points to spec then set timing and see you later. Time was money! Lol.
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ACinSC
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Posted: 09 Feb 2024 at 6:13am |
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Good info , thanks everyone!!
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Steve in NJ
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Posted: 10 Feb 2024 at 3:29pm |
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Your showing your age Ed!! LOL!!!
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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