|
Tractor Talk Discussion Board |
Re: Re: 12 Volt coil got hot and blew up
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by RAB on April 28, 2004 at 11:29:54 from (195.93.34.11):
In Reply to: Re: 12 Volt coil got hot and blew up posted by txblu on April 28, 2004 at 09:29:52:
As the coil is an inductor the running current will rise exponentially and so would be less than 70% of the maximum current (when the current will obey Ohm's Law). Remember, as well dwell angle is time points are closed (I forgot and got it wrong way round early one morning!).
Furthermore, even a change from 70% to 100% current is actually a 43% rise in current......and so it will practically be more than this!!
Of course, in a well designed system the cheapest component, or easiest to fix, should have gone pop first - not the most expensive component! - so it might need a smaller (power rating) ballast resistor of a higher ohmic value (if needed) to protect the new coil. Kinda complicated, so I suspect that some non standard parts may have been fitted at some stage, as I am sure the original system would have been tested, like this one, by lots of owners over the years, and not too many coils would have exploded.
Regards, RAB
Follow Ups:
Home
| Forums
Today's Featured Article -
Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
Copyright © 1997-2025 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 |
|
