Posted by Janicholson on September 08, 2011 at 20:37:53 from (67.72.98.45):
In Reply to: JaNicholson... posted by DeltaRed on September 08, 2011 at 20:12:48:
Owen is correct. The primary feature of a "popup" piston (one extending into the combustion chamber) is to raise compression without changing the combustion chamber design, or milling the head. The key factors are producing a design that doesnot hit the combustion chamber edges, or hit the valves during the Overlap moment. (not an issue with slow operating tractor engines, butr way important in auto engines that can (and do crash destructively if the timing belt/gears get out of sync. Swirl and compression turbulance is nice for increasing efficiency of combustion in days before direct injection gas engines now being introduced. Unless a lab is dedicated to high end research into flame travel, and unburned hydrocarbons, the "crater" element would be hard to prove effective in promoting swirl/turbulance. Intake runner, valve angle, and chamber design are vrey much more important in Swirl than dome shape. I hope this helps. Jim
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 Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
... [Read Article]
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.
