Several things to say: Turbos on either engine are not to be considered, as they "create" additional compression ratio, and volume of air/fuel passing through the engines displacement which invalidates either argument. Gasoline burns from point of ignition, to the quench areas of the farthest combustion chamber cold walls (slow is relative). Timing is always functioning to produce the Peak Effective pressure shortly after TDC, and usually not much after 10degrees past TDC. Piston provided crank speed increases dramatically in that window. If the ignition is spark induced, the prime timing is always at the ragged edge of spark knock. Usually held to that in a very modern gasoline engine in every cylinder by sonic analysis of the sound of the tiny beginning of knock and learned to stay there at a wide variety of speeds/loads/temps/altitudes and fuels. Late timing is obviously not causing the Pressure to be available for better down push on the piston, the engine just heats and makes no real power. Any explosion in a gasoline engine combustion chamber is very bad (with the exception of the tiny spark knock above). When fuel detonates, it combusts through its entire volume at the same instant. This is due to the heat and pressure on a fuel being high enough that it reaches its kindling temperature through its volume, rather than as a flame front progressing through the volume. Diesels inject fuel into the super heated air well within the fuels kindling temp. It also burns in a flame based manor, but far more all at once than gasoline as it is atomized into the ignitor (hot air) in a fog of spray that makes the typical diesel rattle from its rate of combustion. There is more energy in a gallon of diesel, than gasoline. The slow reving of a diesel is related to the dramatically heavier internal parts and flywheel, not flame rate. these are related to higher instantaneous loading, and far higher compression and expansion ratios of the engine. Direst injection gasoline engines are incredibly interesting and in many ways mimicking properties of diesel combustion tactics. Particularly in that the quench areas of the chamber and walls are never presented with fuel, and thus far less unburned HC, and cooler surfaces as well as less fuel dilution of cylinder wall oil on cold start, or intermittent running. I just had to get these thing said. 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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [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.
