Other books to his credit are modern engine tuning, two stroke performance tuning and forced induction performance tuning. The basicexhaust tuning mechanisms was described w ith respect to a twostroke singlecylinder engine. There are different phases taking place in the crankcase and in the cylinder bore at the same time. Roketa 50cc 2 stroke moped scooter mc2650 90% assembled. 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.
Also check out the spark plug troubleshooting guide from the good folks at ngk. For manufacter and tuner of two stroke engine, ntproject has developed a series of software to help in the development of the engine and its components. Two stroke moped tuning a tool to tune your two stroke. Aussie twostroke engine invention motorbike writer. Two stroke cycle engine petrol engine in two stroke cycle engines, the whole sequence of events i. In contrast, a two stroke engine s valve timing may be altered simply by reshaping the holes in its cylinders, and its power output markedly changed by utilizing inertia and resonant effects in its intake and exhaust tracts. On two stroke carburetors this is an air screw so dont forget turning the screw out is a leaner mixture. That is how a two stroke engine completes a power cycle in only 360 degrees of. This is in my opinion, hands down the bible of 2 stroke engine tuning. Written in the early 1970s by cycle magazine writer and engine tuner extrordinare you can learn more about a 2 stroke engine from this book then you can imagine.
Using the throttle, keep the engine at a low rpm, just above stall rpm. Two stroke high performance parts scooter parts for gy6. Two stroke principles although a two stroke engine has less moving parts than a four stroke engine, a two stroke is a complex engine because it relies on gas dynamics. Two stroke performance tuning two stroke all of these detonation triggers are virtually unavoidable, with the exception of excessive spark lead. The great attraction of the twostroke is its enormous potential, contrasted with its appealing simplicity. Although this book is directed to small bikes and karts all the information is relevant to two stroke scooters. That is how a twostroke engine completes a power cycle in only 360 degrees of. Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning. This is in contrast to a fourstroke engine, which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions.
Software for optimal setting and design of engines and. Twostroke motorcycle troubleshooting guide cyclepedia. Two stroke petrol engines are preferred when mechanical simplicity, light weight, and high powertoweight ratio are design priorities. A reference book for the enthusiast engine tuner and race engine builder. Detailed modifications and improvements are described. Its called crankcase independent twostroke cits and was invented by former south african motorsport engineer basil van rooyen, director of cits engineering, st ives he says advantages over fourstroke are that the cits engine is more powerful, lighter, smaller. Pdf improving the performance of twostroke motorcycle with. Gordon jennings was a life long motorcycle enthusiast and writer who worked as an editor for cycle magazine and motorcyclist magazine. Oct 01, 2018 two stroke cylinder porting tips watch this before you start cutting. The twostroke engine, by its nature is very dependent on the unsteady gas dynamics within an exhaust system.
A tuned pipe has a set of cones divergent meaning the cone gets bigger and convergent meaning the cone gets smaller. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. You may choose from dr pulley slider weights and ncy roller weights to 70cc cylinder kits from stage 6, anetha, malossi, athena, polini. The fuelair mixture is first drawn into the crankcase by the vacuum that is created during the upward stroke of the piston. This is a very hard to find and excellent handbook for anyone looking to tune their 2 stroke engines.
I am very proud of the riders i helped and sponsored and there is an appendix. In consideration of current emissions legislation, a twostroke engine can be fitted with a. Performance engineering 2 stroke tuning we specialise in honda 2strokes, covering the cr range of motorcross bikes, the nsr250 street bikes, and hrc grand prix 125, 250, and 500s. This comprehensive textbook is designed to help students learn the construction, operation, service, and repair of modern twostroke engines. Twostroke principles although a twostroke engine has less moving parts than a fourstroke engine, a twostroke is a complex engine because it relies on gas dynamics. It is designed as a general guide to assist in troubleshooting some of the. With the traditional lubrication technique of mixing oil into the fuel, they also have the advantage of working in any orientation, as there is no oil reservoir dependent on gravity. There are plenty of books telling the theory of all different.
The way a two stroke motor works causes them to be fairly noisy and a bit inefficient. The high performance 2stroke engine is a pulse resonance engine which means that the operation in general and the scavenging in particular is not only dependent upon the pulses created from piston pumping but also from combustion properties. Motorcycle tuning twostroke by john robinson goodreads. 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 carb on your go kart, this book is for you. Discover delightful childrens books with prime book box, a subscription that. Those of us who have grown up in the japanese twostroke. This website and app will help you tune your moped or any two stroke engine. Twostroke performance tuning in theory and practice a. Armed with little in this well established book, now brought up to date in a second edition, the technical editor of performance bikes shows you how to evaluate your engine, how to assess what work you can undertake yourself, and what is.
Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a two stroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. A sydney engineering company has developed a new twostroke engine that they believe could be used in motorcycles. Everyday low prices and free delivery on eligible orders. Researchers have found that it is the gases at the very outer limits of the combustion chamber, called the end gases, that selfignite to cause detonation. I think this book is the best book for 2 stroke engine builders and tuners to start out with. Two stroke performance tuning twostroke all of these detonation triggers are virtually unavoidable, with the exception of excessive spark lead. Good resources on cylinder porting and tuning in general include jennings two stroke tuners handbook, and two stroke performance tuning by a graham bell. Tuned adjustableexhaust pipe for use on two stroke motorcycle was designed and tested. The high performance 2 stroke engine is a pulse resonance engine which means that the operation in general and the scavenging in particular is not only dependent upon the pulses created from piston pumping but also from combustion properties. New material on electronic fuel injection and computerized. Small 2stroke, 2249cc complete engines are commonly found on standup, chinese gas scooters, pocket bikes, minichoppers, small dirt bikes and atvs.
Two stroke cylinder porting tips watch this before you start cutting. A textbook dealing with the principles of design and construction, with a special chapter on the two stroke engine paperback or softback by kean, francis john and a great selection of related books, art and collectibles available now at. The effects of the catalytic converter on twostroke. This app was developed in order to tune a puch maxi stock cylinder. Get peak performance from twostroke engines do you spend more time trying to start your weed trimmer than you do enjoying your backyard. In contrast, a twostroke engines valve timing may be altered simply by reshaping the holes in its cylinders, and its power output markedly changed by utilizing inertia and resonant effects in its intake and exhaust tracts. A book for all interested in twostroke engines, their tuning and testing and in the intriguing problems of twostroke design. Plus making a piston port in to a reeded motor isnt a casereed. The book covers the twostroke engine, its parts, its tests, its operation, its phases, its uses and the auxiliary equipment with it. Performance engineering 2stroke tuning we specialise in honda 2strokes, covering the cr range of motorcross bikes, the nsr250 street bikes, and hrc grand prix 125, 250, and 500s. Twostroke performance tuning in theory and practice.
If youve ever thought about futzing with the port timing of your scooter s one cylinder engine or making your own performance exhaust for your dirtbike or tuning the carb on your go kart, this book is for you. A tool to tune your two stroke engine, calculate duration, time areas, etc. Usually when someone refers to something as being economical the image of a bare bones, dull, an cheap product come to mind. 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. Small 2 stroke, 2249cc complete engines are commonly found on standup, chinese gas scooters, pocket bikes, minichoppers, small dirt bikes and atvs. The two stroke engine employs both the crankcase and the cylinder to achieve all the elements of the otto cycle in only two strokes of the piston. I would really like to see some new two stroke porting books. Very few other books on engine development and most of these are either. A book for all interested in two stroke engines, their tuning and testing and in the intriguing problems of two stroke design. There are plenty of books telling the theory of all different types of two strokes and how each work.
I usually recommend this book along with gordon jennings two stroke tuners handbook, because this. It features numerous illustrations and photographs for dynamic visual instruction. Generally, you will also need to rejet your carburetor to allow a greater volume of fuelair mixture to enter your. This comprehensive textbook is designed to help students learn the construction, operation, service, and repair of modern two stroke engines. Scarce title on twostroke engines written by cesare rossaglia, a designer of both highperformance and racing engines. Oct 24, 2017 10 ways to gain power in a 2 stroke engine for free. This two stroke engine tuners document contains the formulas, theory, examples and illustrations to literally turn anyone into a professional two stroke engine guru. If you own a scooter such as a zuma, budy scooter, or anything with a minarelli base motor also know as a jog motor this video will apply. Excellent reference material to make your bike faster. From the bellmouth of the carburetor, to the insert of the reed valve and the reed petals, at the studied of the cylinder ports, until to the balance of the crankshaft, thanks at our software you could optimize your engine and to. Motorcycle tuning twostroke 1994 edition open library.
The illustrated engine features a poppet intake valve. Those of us who have grown up in the japanese two stroke. Dec 01, 2009 with this howto guide, you can win the battle with the temperamental two stroke engine. These kits replace your cylinder and piston with a larger bore. On the other hand, while the twostroke engine does not commonly require large. A textbook dealing with the principles of design and construction, with a special chapter on the twostroke engine paperback or softback by kean, francis john and a great selection of related books, art. Bells fourstroke performance tuning book, this book goes into extreme detail regarding performance tuning a twostroke engine.
This is demonstrated by the tuning effects on twostroke engines, which have been well documented. To familiarize yourself with two stroke engine tuning, read the two stroke tuners handbook by gordon jennings as well as two stroke performance tuning by a. Contents chapter 1 introduction 9 chapter 2 the cylinder. With this howto guide, you can win the battle with the temperamental twostroke engine. Bells four stroke performance tuning book, this book goes into extreme detail regarding performance tuning a two stroke engine. Its called crankcase independent twostroke cits and was invented by former south african motorsport engineer basil van rooyen, director of cits engineering, st ives.
The great attraction of the two stroke is its enormous potential, contrasted with its appealing simplicity. The brand new roketa 50cc 2 stroke moped scooter mc2650 is the most economically stylish scooter you will ever find on the road. Scootertronics offers high performance scooter parts for the popular scooter engine 40qmb used in chinese scooters from keeway, jonway, strada, vento and many other two stroke scooters. He says advantages over fourstroke are that the cits engine is more powerful, lighter, smaller, cheaper, more economical and with lower emissions. Therefore scooter tuners need to go back to the basics and have some understanding of the twostroke engine. Twostroke engines cultivates a sound understanding of twostroke engines used in the outdoor power equipment industry. A twostroke or twocycle engine is a type of internal combustion engine which completes a power cycle with two strokes up and down movements of the piston during only one crankshaft revolution. Velosolex s 3800 2stroke tuning and engine design books. The power stroke supplies necessary momentum for useful work. It covers history, physics, engineering and practicum for the development and refinement of high performance two stroke engines. There are many ways to boost the power, one of which is by installing a tuned pipe.
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. This is a highly saught after book by motorcycle enthusiests. Pdf engine performance is strongly dependent on gas dynamic phenomena. Twostroke high performance engine design and tuning. On the other hand, while the two stroke engine does not commonly require large. It covers my early days in the motorcycle trade, on to starting my own mc business then forming my tuning business. The basicexhaust tuning mechanisms was described w ith respect to a two stroke singlecylinder engine. Information relates to engine to be found in formula junior cars, karts and outboard motor boats as well as scooters and motorcycles, detailed manual includes 290pages.
Motor cycle tuning two stroke by robinson, john, 1994, newnes edition, in english 2nd ed. Use the throttle to slightly increase and decrease the rpm. Pdf improving the performance of twostroke motorcycle. I usually recommend this book along with gordon jennings two stroke tuners handbook, because this book has what the first one doesnt and vice versa. Motor cycle tuning twostroke by robinson, john, 1994, newnes edition, in english 2nd ed. There is quite a large section on changing the face of production racing and into the marlboro series and the lc era and through the kr1s and rgv eras. Tuned adjustableexhaust pipe for use on twostroke motorcycle was designed and tested.
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