While having the coil primary properly connected is a GOOD thing, it's not making for his hard starting problem.
Actually, coil primary polarity actually has NO effect on starting when the spark plugs' center electrodes and ground electrodes are BOTH at ambient temperature.
Proper coil/spark polarity DOES matter when the engine is running and the center electrode of the spark plugs is HOTTER than the ground electrode.
You want a negative-going leading edge to the spark as the the HOTTER center electrode of the plug is a better emitter of electrons than the COOLER ground electrode due to the Thermionic Effect (Edison Effect).
Improper spark polarity CAN cause a missfire under lean or WOT conditions when the ignition system is marginal and needs all the help it can get.
As a side note MANY modern vehicle ignition systems are of the "waste spark" variety where one coil fires two sparkplugs, one with the desired polarity and the other with reversed polarity.
Yet, the engines run well 'cause the ignition system is designed to produce a "hot" enough spark to fire a plug at either polarity.
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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
... [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.
