Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Farmall & IHC Tractors Discussion Forum
:

Does it matter,coil wiring

Welcome Guest, Log in or Register
Author 
BEL@IN

07-17-2007 02:06:48




Report to Moderator

My 450 has an alternator, 12 volt, with negative ground. When I got it the wire from the switch went to the negative side of the coil. It ran fine, but didn`t seem right to me so I changed the wire from the swith to the positive side of the coil. Still runs fine. Any comments are appreciated.




[Log in to Reply]   [No Email]
old

07-17-2007 07:58:18




Report to Moderator
 Re: Does it matter,coil wiring in reply to BEL@IN, 07-17-2007 02:06:48  
As the others have said but to put it in simple words. If you ahev a + ground tractor the + side goes to the distubutor and if - ground the - side goes to the distubutor.



[Log in to Reply]  [No Email]
Janicholson

07-17-2007 06:08:37




Report to Moderator
 Re: Does it matter,coil wiring in reply to BEL@IN, 07-17-2007 02:06:48  
The spark across the plugs consists of a series of rapid bursts of electrons which initialize their path through the fuel charge by building up voltage until the force of the volts exceeds the resistance of the fuel/air mix. As the spark is essetially pulsed DC elecrticity, it is polarized. If it jumps from the ground electrode to the center electrode, most of the burst of charged gasses (plasma) in the spark will be near the cooler part of the exposed parts of the plug. This has been proven in testing under lab conditions to begin the flame travel in the fuel/air mix less efficiently than when polarized correctly. How much effect this has changes from engine to engine, plug to plug within the engine, and fuel to fuel (and other factors).
The effect was large enough to be noticed by manufacturers and engineers when point and coil ignitions replaced make and break, viabrator, and hot tube ignition in the early 1900's, even with much less sophisticated dynos. I hope this makes sense. A tractor engine may not seem to run any differently, but it is.
Some think that if it is firing on all cylinders it is working perfectly, Not true, spark intensity and polarity make a difference. JimN

[Log in to Reply]  [No Email]
Owen Aaland

07-17-2007 14:20:00




Report to Moderator
 Re: Does it matter,coil wiring in reply to Janicholson, 07-17-2007 06:08:37  
This seems to not be much of an issue today with all the "waste spark" ignition systems being used. Two spark plugs are being fired from the same coil, once every chrankshaft revolution. The circut starts at the coil and goes to one plug, through the engine, out through the other plug and back to the coil.



[Log in to Reply]  [No Email]
Janicholson

07-17-2007 21:14:03




Report to Moderator
 Re: Does it matter,coil wiring in reply to Owen Aaland, 07-17-2007 14:20:00  
The precision of computer control, the decidedly crisp switching of a power transistor, and a flame throwing coil reduce the problem to irrelevant. But we still spark the old ones with the luck of mechanical points and the mushy electronics of a condenser. Fun stuff. JimN



[Log in to Reply]  [No Email]
John T

07-17-2007 06:25:34




Report to Moderator
 Re: Does it matter,coil wiring in reply to Janicholson, 07-17-2007 06:08:37  
WOW Jim, great info, thanks for sharing. I use the vacuum tube analogy in that its easier to emit electrons from a hot surface to a relatively cooler one, which is why in the tube the cathode is heated and electrons flow from there up to the cooler plate. In the spark plug its easier to emit electrons from the hotter tip to the much cooler ground strap accounting for why a coil runs cooler and more efficient and fires at less voltage WHEN THE COIL POLARITY IS CORRECT.

It sounds to me like your charge burst and plasma talk provides a "physics" explanation of the situation I described above, YOU AGREE????? ?

Wonder what our ME friends Bob M and Bob have to say????? ??

Take care,

John T

[Log in to Reply]  [No Email]
Janicholson

07-17-2007 08:23:27




Report to Moderator
 Re: Does it matter,coil wiring in reply to John T, 07-17-2007 06:25:34  
I do agree.
Plasmas are the 4th state of matter, and very common (in the greater universe) Hot they are and the fatter the atom, the easier it is to strip off valence electrons. Pleasant topic!!! JimN



[Log in to Reply]  [No Email]
Dan(Mass)

07-17-2007 03:33:20




Report to Moderator
 Re: Does it matter,coil wiring in reply to BEL@IN, 07-17-2007 02:06:48  
I've been told it does't matter. The difference is that you points will fire from the opposite side.



[Log in to Reply]  [No Email]
John M

07-17-2007 03:07:32




Report to Moderator
 Re: Does it matter,coil wiring in reply to BEL@IN, 07-17-2007 02:06:48  
Some say it does, but like you I havent been able to tell any difference, and I have coils both ways that havent given me a days trouble.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
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 ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

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.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy