Posted by oldfarmkid on April 26, 2020 at 07:16:48 from (24.178.151.122):
In Reply to: confused over coils posted by Charlie M on April 25, 2020 at 06:32:57:
Don't think my comments on 6 volt coil labeled no ballast required, was taken seriously. Plus comment on using bosh motorcycle 6 volt coil was dismissed as foolish. The first item should be taken seriously. If new coil is mislabeled as no ballast resistor required, a burned up new coil and being stalled miles from home could be the result. The values that are in question on coil mislabel are as follows. Normal spec for 6 volt coil resistance is 1.25 to 2.0 ohms. Since the ballast resistor is in series with the coil, if a ballast resistor is built into the 6 volt coil as the label infers, internal resistance should read between 4.65 to 5.4 ohms. Ballast resistors for tractors I've worked on measure 3.5 ohms. But the new 6 volt coil in question measured 1.3 ohms well within spec for a common 6 volt coil with no internal ballast. If coil is labeled correctly, where did the added resistance of the internal ballast resistor go? Proof of my conclusion was a weak spark with new coil, no ballast resistor. With ballast resistor, spark was much stronger blue in color. And would produce a spark across a 2 3/4 inch gap on an ignition spark gap tester. Inferring lawnmower, car motorcycle coils being used also minimized the facts of my comments. The spec sheet for a Bosh 6 volt coil built for a 1975 BMW R90/6 motorcycle fits the specs and physical size for a 6 volt tractor coil. Similar power, points ignition. Voltage is 12 volts, but two coils are in series so no ballast is required. With all that said, just saying I stand by my comments and suggestions Mr John T.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
... [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]
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.
