I will take issue with the spark at idle is harder to establish. There is compression at idle not vacuum . If you are at high RPM and then back off the throttle the engine very often does back fire proving your statement is correct about poor ionization in a vacuum. My field of working in power stations with high voltage switching equipment that has various ways for arc quenching has used that one.
The poor idle issues for most old tractors is with the magneto systems. A mag fires hotter(more voltage) as the rpm goes up. The only way to start with a mag is the impulse unit that speeds up the armature on the mag to get a spark hot enough for starting and low rpm. In the parades just about all the time one tractor starts missing with a fouled plug.
Also you are correct in your statement that dwell does not change , but I respectfully cannot agree that the difference of 600 to 2000 rpm take the same current.
(ie) dwell for chev 350 v8 is 28-32 degrees. That is with a gap of 17 thousand. If you have it at 30 degrees then open time is 15 degrees. Dwell angle for four cylinders are around to 60 degrees then the open is 30 degrees. If the points gap is smaller the dwell angle is higher as in our old tractors.
anyway I am of to pick up a 300U, good metal and tires and is supposed to run well. The wife said she would drive it in the parade of power if we get it fixed 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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
... [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.
