 Petronics Ignition question, Dwell percentage |
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| ILM914 |
 Sep 24 2011, 10:56 AM
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#1
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Member  Group: Members Posts: 98 Joined: 3-March 09 From: NC Member No.: 10,126 Region Association: None  |
Hello everyone I installed a Petronics Elec ignition. Car runs good and I timed it OK with a strobe light; but when I check the Dwell (percent value) it reads 69% while my Haynes Manual says it should read 49-55%. I tried changed the gap between the magnet and the module but it made no difference. Is it ok to leave it at the 69% setting? Thanks, Joe
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| TheCabinetmaker |
Sep 24 2011, 11:19 AM
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#2
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I drive my car everyday Group: Members Posts: 8,318 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
You don't have points any more. Therefore, you have no dwell either. Set the gap with the feeler gauge provided and forget it. easy as that.
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| Drums66 |
Sep 24 2011, 11:27 AM
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#3
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
......Ya dig, it is a set it & forget it type situation...cool drive on! (IMG:style_emoticons/default/driving.gif)
excellent choice (IMG:style_emoticons/default/idea.gif) (IMG:style_emoticons/default/bye1.gif) (IMG:style_emoticons/default/yellowsleep[1].gif) (IMG:style_emoticons/default/yellowsleep[1].gif) (IMG:style_emoticons/default/popcorn[1].gif) |
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| type47 |
Sep 24 2011, 03:03 PM
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#4
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
When you change from points to pertronix, will the timing change with the pertronix compared to the timing with points? Another way, do you have to reset the timing with a strobe light when a pertronix is installed. If the timing is set within spec does installing Pertronix change the timing?
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| Dave_Darling |
Sep 24 2011, 03:43 PM
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#5
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914 Idiot Group: Members Posts: 15,051 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Yes, the timing may change. At the very least, you need to re-check the timing.
--DD |
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| messix |
Sep 24 2011, 04:59 PM
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#6
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
it can get away with a longer dwell time because it is an electronic circuit and not a mechanical switch [the points], the points are not as precise as the electronic module over the rpm range thats why the increase in dwell
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| Spoke |
Sep 24 2011, 07:52 PM
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#7
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Jerry Group: Members Posts: 7,079 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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The reason for dwell is to give the coil time to build up energy. The Pertronix takes dwell out of the equation. Time it and drive it like you stole it.
(IMG:style_emoticons/default/driving.gif) |
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| ILM914 |
Oct 5 2011, 05:31 PM
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#8
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Member Group: Members Posts: 98 Joined: 3-March 09 From: NC Member No.: 10,126 Region Association: None |
Thank you very much I appreciate the resonse, Joe
QUOTE(vsg914 @ Sep 24 2011, 09:19 AM)  You don't have points any more. Therefore, you have no dwell either. Set the gap with the feeler gauge provided and forget it. easy as that. |
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| Cap'n Krusty |
Oct 5 2011, 06:54 PM
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#9
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(ILM914 @ Sep 24 2011, 09:56 AM) Hello everyone I installed a Petronics Elec ignition. Car runs good and I timed it OK with a strobe light; but when I check the Dwell (percent value) it reads 69% while my Haynes Manual says it should read 49-55%. I tried changed the gap between the magnet and the module but it made no difference. Is it ok to leave it at the 69% setting? Thanks, Joe The dwell is fine. The figure quoted in Haynes is for points. It's wrong, but it's for points. The real number is 47 degrees +/- 2 degrees. The Cap'n |
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| ILM914 |
Oct 10 2011, 08:19 PM
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#10
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Member Group: Members Posts: 98 Joined: 3-March 09 From: NC Member No.: 10,126 Region Association: None |
Thank you everone, much appreciated. I am happy, rebuilt Dizzy works great. car is running awesome, nice low rev power.
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