Posted by John T on March 10, 2015 at 12:11:58 from (71.55.236.60):
In Reply to: points diagnosis posted by IanC on March 10, 2015 at 06:16:02:
Here's the deal as I understand it but remember I graduated EE school almost 50 years agooooooooo
When the points are closed and the coil is conducting current there's obviously no current through the shorted out condenser, its a big discharged empty electron bank sittin there. Then when the points open and voltage rises across the points and condenser, the condenser is initially at Time T = 0 +, like a short circuit and conducts current for a short time until its charged up after which it no longer conducts and appears as an open circuit to DC. Then when the points close again that stored condenser energy dissipates and its discharged. If the condenser is sized properly and the LC circuit is correctly sized current is near the same each time so points wear is equal on both sides. If its not the same due to an incorrect condenser value, you get a pit on one side and a hill build up on the other.
The condenser saves the points from premature burning as it accepts current and acts as a shock absorber reducing the burning and arcing across the points. If its open or no condenser at all, she still fires but a weaker spark plus the points burn up too fast. If the condenser is too big she will never fire at all. If its sized correct you get a strong spark plus the points last longer.
Electrons have mass so their bumping into the points sides has an effect and if you figure they are negative charged particles you can figure which way the pit or hill builds up.
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: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
... [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.
