Mallory ignition questions, Partial success! |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Mallory ignition questions, Partial success! |
VaccaRabite |
Oct 10 2010, 05:59 PM
Post
#1
|
En Garde! Group: Admin Posts: 13,584 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 |
zx-niner |
Oct 10 2010, 10:22 PM
Post
#2
|
Member Group: Members Posts: 294 Joined: 13-June 05 From: Las Vegas, NV Member No.: 4,269 Region Association: Central California |
When you say the ignition is behind a resistor block are you referring to the resistor that Mallory shows in line with the positive coil junction for coils that do not have the proper internal resistance? I've been told the Bosch blue coil has adequate internal resistance and does not need the additional ballast resistor.
|
orange914 |
Oct 10 2010, 11:31 PM
Post
#3
|
http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
When you say the ignition is behind a resistor block are you referring to the resistor that Mallory shows in line with the positive coil junction for coils that do not have the proper internal resistance? I've been told the Bosch blue coil has adequate internal resistance and does not need the additional ballast resistor. i just went through this with the coil resistance for a pertronix (IF mallory has the same requirement). IT required 2.5 to 3.0 ohm resistance. the mallery blaster only has 0.7 so a resister was needed. we ended up using a new stock ford (points) coil. it had 2.5 ohms, so no additional resister. the pertronix guy DID say they see weird intermittant issues (not just run/no run) when a needed resister is not run. again may or may not relate to mallory F.Y.I. local flaps carries 77 chrysler van 318 ballest resister was 1.8 ohms and chevy had one @ 2.5 ohms . |
Lo-Fi Version | Time is now: 31st October 2024 - 04:51 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |