Mallory ignition questions, Partial success! |
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Mallory ignition questions, Partial success! |
VaccaRabite |
Oct 10 2010, 05:59 PM
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#1
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En Garde! Group: Admin Posts: 13,456 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
My carbed 2056 uses a Mallory Unilite ignition. All summer long I have been fighting intermitant misses leading to the motor dieing at idle. After dicking with the carbs and adding fresh spark plugs, I am now moving to ignition.
So here is how my system is set up. Bosch blue coil. Mallory Unilite ignition. The ignition is behind a resistor block. MSD spiral wound plug wires. NKG b5es plugs pregapped (one heat range hotter then stock as suggested in the resent spark plug thread) . My tach is not dancing when I have a miss. The idle indicated drops as expected, no drama. So I don't think that the coil is grounding out or arcing. As I understand the Mallory dizzy, it either works or it does not work, and there is not a lot of in-between. My primary suspects are the plug wires. I am using the MSD spiral wound wires suggested for use with the Mallory, and I have only been using them this season. Since you are not supposed to use the regular plug wires with a Mallory (as they can somehow cause the optical unit to burn out) buying replacement wires on a hunch is kinda expensive. Am I chasing my tail with this? Also, I am using the stock gap. I think I am supposed to be able to use a wider gap with the Mallory, which will give better ignition. What kind of gap should I be shooting for? If it does turn out to be the plug wires as the problem area, should I go back to the stock heat range plugs, or stay with the hotter ranged plugs? Oh, and for the "go back to FI" crowd, my motor is using a cam that would cause D Jet to commit suicide. In this case, it is not an option. Zach |
curt914 |
Oct 27 2010, 08:50 PM
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#2
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Newbie Group: Members Posts: 46 Joined: 6-March 04 From: Lompoc, Ca Member No.: 1,757 Region Association: None |
Hi Zach
Been following your thread and waiting to see how things turn out as I pretty much have the same setup. Wondering if your misfire is due to the spark plug wires "leaking" somewhere along the way. Maybe to ground or to another spark plug wire? Also, could it be the cap (near the spark plug towers) leaking to the tin nearby. As you know, you have to pound the tin into submission just to get the distributor in to begin with. After round 1 with the tin, I repainted it a time or two in the area of the distributor and also put a layer or two of electical tape on the tin right where the distributor cap is very close to the tin. Are you sure the spark plug wires are completely seated all the way down in the distributor spark towers? Its such a tight fit to get the wire and the boots all the way down and it would be a short hop for high voltage to find the tin (ground). Well, good luck, hope you get to the bottom of it. (IMG:style_emoticons/default/smile.gif) Curt |
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