Farmall & IHC Tractors Discussion Board |
Re: 12V Conversion coil question for John T or oth
[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]
Posted by John T on March 31, 2007 at 20:08:39 from (66.244.90.5):
In Reply to: 12V Conversion coil question for John T or others posted by Ron in Nebr on March 31, 2007 at 19:45:41:
Ron, Many 12 volt systems (car or tractor) still had the 6 volt coil even though it required the external ballast and theres one big advantage that system has. Its that if the ballast is external, its possible to by pass jump aorund it ONLY WHILE STARTING for a hotter starting spark. Thats cuz while cranking the battery voltage can drop drastically at cold temps so with an external ballast its easy to by pass it while cranking which could improve extreme cold weather starting VRESUS a coil that had no external ballast capable of by passing. NOOOOOOOO a 12 volt system that uses a full true 12 volt rated coil (some call internally ballasted) DOES NOT USE EXTERNAL BALLAST. A weakness in point ignitions is excess current would cause premature point burn up so the current is limited to 4 amps or under. Therefore since a 6 volt coil only has say 1.5 ohms resistance you need the other 1.5 ohms of external ballast so the points current is limited to 4 amps. A 12 votl coil already ahs 3 ohms of primary resistance so no extra balalst is used. John T
Replies:
Home
| Forums
Today's Featured Article -
Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
Copyright © 1997-2024 Yesterday's Tractor Co. All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|