Posted by Jerry/MT on December 27, 2007 at 20:58:32 from (206.183.116.129):
In Reply to: Another Coil question posted by John T on December 27, 2007 at 07:33:14:
John, I am not a double E but I believe that first part of 2) is the correct reason. (I had a debate in the N Forum on this very issue that I, unfortunately had to terminate (the debate not the the guy-grin)because the guy got nasty. He argued it made no difference becuase the induced voltage was always the same.)
My thinking is that the secondary current would have to be reduced with incorrect polarity. As I see it, the resistance at the plug tip is higher when current has to jump across the spark gap from the cold ground eletrode versus jumping the gap from the hot electrode to the cold ground. But the induced voltage is the same in each case since it is a function of the primary current and the turn ratio. So therefore the secondary current would have to be lower in the case of incorrect polarity operation. The spark power (the integral of eidt over the spark interval) would be less for the incorrect polarity than for the correct polarity. My simple minded approach is to see the spark gap as a series resistance, whose value is dependent on the direction of current flow. I hope this makes sense to you. It didn"t to the other guy.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [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]
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.
