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point gap? |
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ccowx 
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Joined: Nov/03/2010 Location: Yukon Status: Offline Points: 3510 |
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 Topic: point gap?Posted: Oct/20/2011 at 10:27pm |
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This is an easy one! What point gap would you suggest with a stock Delco distributor? I have a dwell meter but I am not trusting it. To get 30 degrees of dwell it wants about .025 gap. That sounds very large to me and since the tester is old (surprise) and used I am not sure of it's accuracy.
Just curious. Thanks, Chris
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THE MENACE
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Joined: Nov/04/2008 Location: So. California Status: Offline Points: 4438 |
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Posted: Oct/20/2011 at 10:44pm |
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It's been a while, but I have always set them at .016.
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The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's car) 72 Gremlin Autocross Project. |
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SCReplica
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Joined: Apr/18/2011 Location: Snellville GA Status: Offline Points: 47 |
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Posted: Oct/20/2011 at 10:44pm |
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Point gap should be .019 for new, .017 for used, with rubbing block on point of distributor lobe.
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ccowx
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Posted: Oct/20/2011 at 11:19pm |
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Pretty much like I figured. I have been setting points for almost 20 years and .025 seems wrong, whatever my dwell meter says. Time for a new dwell meter!
Thanks! Chris
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billd
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Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Posted: Oct/21/2011 at 6:36am |
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Matchbook cover, I go about .017-.018 personally.
Gap will close a bit with wear, that means dwell will increase and timing slow just a bit. |
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carnuck
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Posted: Oct/21/2011 at 9:04am |
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Is the dwellmeter set for V8 or 4 cyl?
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purple72Gremlin
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Posted: Oct/21/2011 at 11:14am |
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Seems I remember shooting for 30 degrees of dwell......
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wantajav
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Posted: Oct/22/2011 at 5:15pm |
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That might be my problem too, was going off the dwell meter, but that's what the factory said to trust
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FSJunkie
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Posted: Oct/22/2011 at 9:53pm |
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Dwell is just a mesurement of how many degrees of distributor rotation the points are closed. Dwell is just a more accurate way of mesuring point gap. Small gap=large dwell reading, large gap=small dwell reading.
The dwell on a V8 should be 30 degrees and equates to a .016 inch gap, but if your distributor cam is worn, a .016 inch point gap will not equal the correct dwell, so setting the dwell to specification makes up for worn distributor parts to a certain extent.
The reason for a specified point gap is so the points open at the correct time. Dwell is the mesurement of how long they are open, so as long as your dwell is in specification, point gap is pretty much meaningless.
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