Diesel is not measured by "Octane", it is measured by "Cetane". The gas powered engine experienced the 'ping' because of the contamination of diesel which lowered the "Octane" value. That's why some say when your car starts 'pinging' to go from 87 octane to 93 octane to stop the 'ping'.
When gasoline is compressed, the spark detonates the fuel creating combustion. Diesel needs to be much more compressed to get detonation to have combustion.
In a gas engine...what creates this 'ping' is two flame fronts colliding on the compression stroke causing the metallic 'ping' sound. If we could slow down the compression stroke to milliseconds...I'll try to explain what happens. After the fuel charge enters the combustion chamber and both valves are closed. The piston moves up to complete the compression stroke. As the fuel becomes compressed it may detonate before the spark plug arcs to ignite the fuel. The pre-detonation is usually caused by a hot spot on the piston surface i.e. carbon specks, burr of steel, etc. These are usually glowing red hot after a short time from starting the motot.
The hot spot ignites the fuel and as this flame front moves accross the combustion chamber while the piston is completing it's compression stroke. When the piston has reached the length of its stroke the spark plug ignites the fue also. Now you have two flame fronts moving across the combustion chamber towards each other and when they collide is where you get the 'pinging' sound from.
For years many thought this sound came from metal parts 'clanging' angainst each other. Waukesha Engine Division in Waukesha, WI devloped a cylinder with a quartz window so they could view the combustion process. Using high speed photography they were able to see the two flame fronts colliding.
By adding diesel to gasoline you can not get "high pressure spikes and concentrated heat" because diesel needs to be really compressed to obtain that type of detonation. The compression ratio of a gas engine is not anywhere close to the compression ratio of a diesel engine. Therefore, the diesel contamination in gasoline will just foul the plug and soot up the catalytic converter.
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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
... [Read Article]
Latest Ad:
2022 John Deere 5045E, 4wd, front end loader and 3rd function with grapple. 120 hrs, 55k new, must sell
[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.
