Posted by David G on October 27, 2018 at 18:51:21 from (209.181.208.169):
There seems to be some misinformation going around again.
Detonation is caused by explosions along the boundary between rich and lean areas, caused by improper mixing, or over fueling. You cannot have detonation on a lean homogeneous mixture. We see this in the big turbo charged natural gas engines when they are lugged too much, or the turbo is not producing enough boost on the two cycles. A good way to think of this is when you lug an engine down too much starting out and it knocks before picking up, this is caused by over fueling trying to produce the torque, called spark knock by my dad.
Pre-ignition is caused by flakes of carbon that ignite a mixture, by timing that is too advanced for the speed of the flame front, or by a mixture that is above the autoignition temperature. This ignition pushes back on the piston before it has a chance to get the correct angle on the crankshaft to utilize the push. Retarding the timing will help if there are fuel related issues. We re now seeing this issue on the natural gas engines because they are getting more ethane out of the shale gas and it has a lower autoignition temperature.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. 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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [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.
