There are many ways to boost the power, one of which is by installing a tuned pipe. Millennium technologies offers the most complete line of performance services. Twostroke engine repair and maintenance edition 1 by. Twostroke engine repair and maintenance edition 1 available in paperback, nook book. To measure the performance parameters of the engine, an eddy current dynamometer with the power of 15kw was applied fig.
The morbidelli 125 twin road racer is a rotary valve engine. Two stroke performance tuning a disc partially cut away and attached to the end of the crankshaft opens and closes an inlet port in the side of the crankcase. Software for fine tuning and design of two stroke engine. It features drawings, photographs and schematics to guide you along the repairs and stepbystep instructions that are easy to follow. Two stroke performance bike related discussion dirtriderz. The piston crown opens and closes the exhaust and transfer ports. Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. Thriftbooks sells millions of used books at the lowest everyday prices. Wilson performance wp was formed out of the frustration of many twostroke tuners unwillingness to provide answers to most basic questions about twostroke performance tuning. Scavenging of a 2stroke engine involves using pressurized air or an airfuel mixture to flush the exhaust products from the cylinder. The website does not intend to compeed with any other website dealing with 2stroke tuning, and the information shared is not at all as thorough as what you can get from reading the books. Contact details two stroke performance engine tuning.
Buy the highperformance twostroke engine by dixon, prof. Twostroke engine oil produced solely by pars oil company and industrial oil sae10 for industrial use were the petroleumbased lubricants used in the test. Fully revised with the latest information on all areas of engine operation, from air and fuel, through carburation, ignition, cylinders, porting, reed and rotary valves, and exhaust systems to cooling. Ill try and get the ball rolling in here with a list of books i currently own on 2 stroke engines, and 2 stroke engine performance tuning. I usually recommend this book along with gordon jennings two stroke tuners handbook, because this.
Typical 2stroke engines lose approximately 35% of their fuel in the process of scavenging the engine. An excellent academic book on the theory behind performance tuning for 2stroke motorcycles. Fit the head gasket and head and turn the crank to move the piston just past tdc. In the early 20th century they were a primary source of power for small engine displacement application such as mopeds, bikes, lawn movers etc. Twostroke engine repair and maintenance paul dempsey. Twostroke performance tuning in theory and practice. Graham bell steers you through the various modifications that can be made to coax maximum useable power output and mechanical reliability from your twostroke. Bigger carburetors, higher compression ratios, altered port.
Welcome to wilson performance, your twostroke performance authority. The twostroke engine is known for being temperamental, but youll learn the best ways to maintain and repair these engines and keep your machinery running at tip top performance. The other serious weakness, in my view, is the lack of a complete and detailed index. Two stroke performance engineering service mornington. Performances and emissions of a 2stroke diesel engine. Most of my friends and i rode 2 stroke street bikes and welcomed the. Undoubtedly, the virtue which has most contributed to the widespread use and varied application of the twostroke engine is its mechanical simplicity. Carefully pull one strip of clay off the piston and then measure the thickness of the clay left on the piston. Graham bell starts off by saying that he doesnt believe port time area and its all about the duration the ports are open. If youve ever thought about futzing with the port timing of your scooters one cylinder engine or making your own performance exhaust for your dirtbike or tuning the. Twostroke performance services millennium technologies. The purpose of 2 stroke oil along with its 4 stroke cousin is directly, lubrication of vital internal engine components.
Often youve been forced to use the reed petals proposals on the market, without being able to take significant action. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a twostroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. Two stroke tuners handbook 2 another mistake commonly made, sometimes even by those who have enjoyed some success in modifying twostroke engines, is to believe in a kind of mechanistic magic. Jennings book talks about port time area and porting the cylinder to have peak efficiency at a certain rpm. Theyre also lighter, easier to work on, and downright angrier, pumping out a. A reference book for the enthusiast engine tuner and race engine builder. Pdf motorcycle tuning two stroke download full pdf. As promised back in march, ktm has unveiled a fuel injected twostroke engine thats expected to give fourstrokes a good run for their money. Grab both the four stroke and two stroke dirt bike engine building handbook in print. Detailed drawings, schematics, and photographs along with stepbystep instructions make it. Honda files patents for brand new, fuel injected two. Detailed modifications and improvements are described. Those of us who have grown up in the japanese twostroke.
Aussie twostroke engine invention motorbike writer. The most peculiar issue of this prototype is the combustion system, made up of a prechamber, connected to the cylinder through four holes. In this paper some results obtained with a 2stroke 6v53 detroit diesel 5. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. Two stroke performance 25 torca terrace, mornington, victoria 3931 rated 4. Toyota s2 gasoline and s2 diesel engines, suburu super 2stroke, orbital twostroke engine series, and industrial technology research institute itri twostroke technology in taiwan. It was organized to take over all the properties, rights and assets obligations and liabilities of 220 kv and 500kv grid stations and transmission linesnetwork owned by pakistan water and power. Bells fourstroke performance tuning book, this book goes into extreme detail regarding performance tuning a twostroke engine. It suggests that this new technology will reduce emission from 25 to 35 percent inferior than those of a 4stroke engine. Decades have passed since i hung around with john and jim.
New material on electronic fuel injection and computerized. The four and two stroke dirt bike engine building handbooks are a trusted guide for any expert or beginner. I have spoken to them and their knowledge on how to get the most out of two stoke is impressive. There is a wealth of knowledge contained in this manual. Engine, turbocharger, rotary engine, torque, specific impulse, crankshaft, piston, twostroke engine, flywheel by books llc and a great selection of related books, art and collectibles available now at. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. At present there is a 4 stroke chapter, but it follows three longer chapters on 2 strokes engines and repairs. Co, nonox, co 2 and particulate matter pm have been sampled at 1 hz in different load conditions and fuel consumption has been measured. Since then, various innovations have helped two stroke engines achieve greater performance, efficiency and fuel economy. After three years of study and in depth discussions with those willing and most importantly capable of explaining and. Reading the above books, its important to keep in mind that both authors porting generalizations refer to comparisons among fullydeveloped oldschool racing engines, and shouldnt be taken out of context for modification purposes. They are so simple and fun that ive always enjoyed tinkering with them. I started reading these about a year ago now and ive learned so much in just the short time already its mind boggling. The humble twostroke might be the engine of the future.
We personally assess every books quality and offer rare, outofprint treasures. Emmisions, fuel efficiency and cooling requirements will really define its chance of success. I usually recommend this book along with gordon jennings two stroke tuners handbook, because this book. I thinking about getting them to rebuild my engine when tax comes around. Lets journey back to 1973 and read the book that was the two stroke bible of that era. The 2stroke high speed diesel engine concept was investigated in 1999 also by yamaha, who built a cm 3, 2cylinder engine, with crankcase loop scavenging.
In the 2stroke engine with reed valve admission, the identification of petals more adapted to the reed valve and to the engine is essential to maximize the performance starting from the intake phase. Graham bell second edition this is the moped performance tuning bible as far as im concerned. I have the book, but its nice to have as a pdf as well and a good reference for those who dont know about it. Remove the head and then cut the clay down the middle with a sharp, wet knife. A little bit about 4 stroke and 2 strokes engine to prevent unburned airfuel mixture from passing right to the exhaust. The twostroke engine is widely used in both motorc. The two stroke dirt bike engine building handbook diy. By design, a twostroke diesel is powerdense, with a power stroke every revolution, and inherently cleaner than a gasoline twostroke. Work order form two stroke performance engine tuning. Twostrokes are far simpler machines than fourstroke engines. He is the author of more than 20 technical books, including small engine repair. Experimental performance analysis of single cylinder two stroke petrol engine using gasoline and lpg maneesh kumar dubey 1 and ravindra randa corresponding author. There is a huge interest in vintage snowmobiles and their simple two stroke power plants of yesteryear.
Anyone interested in doing their own engine porting, or taking the time to learn the intimate secrets of 2 stroke. For instance, if an engine has been properly designed for medium output and a midrange power peak, raising the. It covers history, physics, engineering and practicum for the development and refinement of high performance two stroke engines. If your looking for a big bore, porting, or a complete motor build we have you covered. Wilson performance your twostroke performance authority. Drawing on the authors many years of experience in tuning and modifying highperformance road, rally and race units, every aspect of an engines operation is explained and analyzed. Geared specifically for gp and kart racers, this hardcover treasure has turned out to be a great reference source for questions on the logic and concepts that pertain to tuning a 2stroke for maximum performance. The way a two stroke motor works causes them to be f.