Other books to his credit are modern engine tuning, twostroke. Detailed modifications and improvements are described. A reference book for the enthusiast engine tuner and race engine builder. Tuning the worlds first twinturbo c8 corvette makes 643whp, and thats just the start tuning the mercedesamg a45 s has been tuned to almost 500ps tuning watch a toyota gr supra engine dyno at. 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. 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. Because of this, this engine needs lubricating oil mixed into the fuel. In an attempt to acquire that understanding i began a study of the highspeed, highoutput twostroke engine that has led to the.
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. Specialising in 2stroke performance services such as porting, cylinder repair and sleeving, crankshaft and engine rebuilding. On a stroker things like matching the ports to the liner, crankcase to transfers etc. 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. With the experience or the simulation you can determine the new timings and the new maximum lift, but what remains problematic is the determination of the lift law and of the cam profile, this to maximize the volumetric efficiency and in the meantime check out the valve. This book covers the process of building 4stroke engines to a professional standard, from selecting materials and planning work, right through to methods of final assembly and.
Undoubtedly, the virtue which has most contributed to the widespread use and varied application of the twostroke engine is its mechanical simplicity. It is important to us that you are happy with all the work that is carried out so you come back to us and share positive feedback with others about the service you received. Everyday low prices and free delivery on eligible orders. A fourstroke engine has four main strokes to its cycle the first stroke, called the intake stroke, the crankshaft pulls down the piston by rotating. It explains in nontechnical language how modern engines can be modified for road and club competition use, with the emphasis.
The most common engine cycle involves four strokes. Drawing on the authors many years of practical experience in tuning and modifying highperformance road, rally and race units, every aspect of an engines operation is explained and analysed. Software for fine tuning and design of four stroke engine. One was george sychrovskys excellent piece two stroke engine mystery solved, dealing largely with how to correctly operate one of the beasts. The intake valve is open at this point in the cycle, and air will be pulled through the intake manifold into the motor. One of the main actions of preparation and development of a 4stroke engine consists in the modification of the camshaft. A fourstroke cycle engine is an internal combustion engine that utilizes four distinct piston strokes intake, compression, power, and exhaust to complete one operating cycle.
Bells fourstroke performance tuning book, this book goes into extreme detail regarding performance tuning a twostroke engine. Here are some useful tips for tuning your gas engine. First rule of 2 stroke or any tuning is to make it like it should be, i. To allow the air to enter into the cylinder or the exhaust, gases to escape from the cylinder, valves are provided, known as inlet and exhaust valves respectively. Great book to read if you are planning an engine tune. Compression stroke piston moving up intake valve closed exhaust valve closed four stroke cycle 20091005 mmpmm 3 4. The valves are mounted either on the cylinder head or on the cylinder block. Tech tune racing motorcross race winning performance 2. Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning.
The guide covers everything you need to know about the correct use and implementation of precision measurement tools when rebuilding your two stroke. The 2stroke engine compresses with a stroke upward and exhausts with a stroke downward. The morbidelli 125 twin road racer is a rotary valve engine. A stroke refers to the full travel of the piston along the cylinder, in either direction. Read this document before reading the applicable tuning section for those controllers, which are here.
Recently i opined with a recommendation of two extremely well written articles on dealing with two strokes. Improving the performance of twostroke motorcycle with. It covers my early days in the motorcycle trade, on to starting my own mc business then forming my tuning business. The descending piston draws a mixture of fuel and air through the open intake valve. The piston make two complete passes in the cylinder to complete one o. Nick swager secrets of speed todays techniques for 4stroke. First published more than 30 years ago and in continuous print ever since, this remains one of the most comprehensive references available to the enthusiast engine tuner and race engine builder. There are some very good two stroke tuning guides from lodgemark press they have done most of the guides that kart racers use. The ford pinto engine was the unofficial but generic nickname for a fourcylinder internal combustion engine built by ford europe.
Basic 2 stroke tuning changing the power band of your dirt bike engine is simple when you know the basics. 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. Pdf improving the performance of twostroke motorcycle with. Every aspect of tuning a petrol engine gets covered. The valves are operated by the action of the camshaft, which has separate cams for the inlet. What really came in handy for me was the exhaust design calculations and how to choose right size diameter and length itbs for my engine. After this is complete the camshaft rotates to the low spot on the lobe. In ford sales literature, it was referred to as the eao or ohc engine and because it was designed to the metric system, it was sometimes called the metric engine. Two stroke high performance engine design and tuning by. Engine tuning the rc gas engine for radio controlled planes will ensure proper acceleration and keep top speed without harm the engine. First published in 1989 as tuning new generation engines, this bestselling book has been fully updated to include the latest developments in fourstroke engine technology in the era of pollution controls, unleaded and lowlead petrol, and electronic management systems. Principles and working of fourstroke gasoline engine.
Engine in which piston completes the cycle in 4 complete rotation of the crankshaft. An excellent academic book on the theory behind performance tuning for 2stroke motorcycles. Graham bell second edition this is the moped performance tuning bible as far as im concerned. New material on electronic fuel injection and computerized engine management systems. Ive spent a lot of time looking for a performance related book that reflected both real world ideas and understanding with a hint of engineering in the explanations and the fourstroke performance tuning has met and exceeded what i thought was available.
The piston crown opens and closes the exhaust and transfer ports. On the other hand, while the twostroke engine does not commonly require large dollar inputs to raise its power output, it does require an indepth under standing on the part of the man doing the modifications. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. Vp110 is a good, allaround fuel for hoppedup twostroke engines. Once knowing the working principles, this work will become much easier.
Two stroke high performance engine design and tuning by cesare bossaglia. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. Well the tt91fs wouldnt be my first or second choice for 3d flying its very heavy compared to almost every other. Those of us who have grown up in the japanese twostroke. Be the first to ask a question about fourstroke performance tuning. The process of building 4stroke engines to a professional standard, from selecting. The is an introduction to tuning with a programmable electronic fuel injection ecu. Why remapping a naturallyaspirated car is totally worth. Basic concept of tuning a 4 stroke petrol engine the.
A fourstroke engine also known as fourcycle is an internal combustion engine in which the piston completes four separate strokes which comprise. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. Present a new 4 stroke engine concept invented by andrew feliks. 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. Thought id better kick the new section off by writing an article for it myself, on the subject of 4 stroke engine tuning, no specific to minis, but all totally relevant. Software for optimal setting and design of engines and. I am very proud of the riders i helped and sponsored and there is an appendix. This stroke of the piston begins at top dead center t. This book really does cover all aspects of tuningmodifying a 4cylinder naturally aspirated engine and is therefore applicable to the majority of na cars in the uk. 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. In this cycle there are 4 different strokes, they are 1. A fourstroke also fourcycle engine is an internal combustion ic engine in which the piston completes four separate strokes while turning the crankshaft. For those that are twostroke focused, we have a precision measuring guide tailored to the 2t engine. This free downloadable guide comes right out of the two stroke dirt bike engine building handbook.