Posted by John T on July 29, 2012 at 11:47:14 from (216.249.82.117):
In Reply to: which coil? posted by red tractorfan on July 29, 2012 at 10:56:06:
Contrary to what most lay persons think, on most of the circa 30's through 60' typical farm tractor ignition coils THERES NO DISCTRETE STAND ALONE "RESISTOR" HIDDEN AWAY SOMEWHERE INSIDE THE CAN.
There are coils designed for use at 6 volts nominal that can still produce a spark at cranking voltage which may be 4.5 volts yet still produce a spark and dissipate the heat at charging voltages of 7 BY THE WAY THOSE ARE LABELED 6 VOLTS. Many (not all) typical 6 volt coils have 1.25 to under 2 ohms LV Primary winding resistance 1.5 is common
There are coils designed for use at 12 volts nominal that can still produce a spark at cranking voltage which may be 9 volts yet still produce a spark and dissipate the heat at charging voltages of 14 BY THE WAY THOSE ARE LABELED 12 VOLTS. Typical LV primary winding resistance is in the range of 2.5 to 4 ohms, 3 is common
I dont think you will find any coils labeled 6 ORRRRRRR 12 volts !!!!!!!!!!!
THE EXTRA RESISTANCE IN A 12 VOLT COIL IS DUE TO MORE WIRE LENGTH OR HIGHER RESISTIVITY WIRE NOTTTTTTTTTT BY TUCKING A "RESISTOR" INSIDE THE CAN
ANSWER If its a 12 volt tractor you can EITHER use a 12 volt coil orrrrrrrrrrrrr use a 6 volt coil with a voltage dropping (12 to 6) extrenal ballst resistor therefore the coil sees only the 6 volts it was desgined to handle. T^here can be an advantage for cold starting if you use a 6 volt coil but by pass it while cranking !!!!!
Many 6 or 12 volt tractors still use the same 6 volt coil, its just that if on a 12 volt tractor they add the ballast
Got it?? Have to run to the Fair I will check back later for any questions
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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[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.